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MaximoAccess

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    [Resolvido] Capturar dados através da porta serial

    Claudinei
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    [Resolvido] Capturar dados através da porta serial Empty [Resolvido] Capturar dados através da porta serial

    Mensagem  Claudinei 15/7/2012, 13:52

    Bom dia amigos do fórum !

    Preciso de uma ajudinha...
    Alguém pode me ajudar com um código que capture dados na porta serial? Preciso ler o peso de uma balança através da porta, para ser mais específico, com as seguintes configurações:

    - porta: COM4
    - baud rate: 9600
    - data bits: 8
    - parity: none
    - stop bits: 1
    - timeout: 100

    Alguém pode me ajudar ??? affraid


    Última edição por Claudinei em 17/7/2012, 14:39, editado 1 vez(es)
    HARYSOHN
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  HARYSOHN 16/7/2012, 03:42

    Boas Claudinei... eu acredito que necessite de alguma dll fornecida pelo fabricante...

    Cumprimentos.
    Claudinei
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  Claudinei 16/7/2012, 11:10

    Bom dia Piloto.

    A dll que tenho só captura os dados da porta COM1 e na verdade o que eu preciso é capturar da porta COM4 com as configurações como descrevi.
    Talvez alguém tenha ou saiba onde posso encontrar um código escrito em VBA que faça a captura.

    Obrigado.
    Jungli
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  Jungli 16/7/2012, 13:06

    Precisamos de informações específicas, sobre a balança.
    Claudinei
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  Claudinei 16/7/2012, 13:20

    Bom dia Jungli

    A balança é uma BJ850 da balanças Jundiaí e as configurações são:
    - porta: COM4
    - baud rate: 9600
    - data bits: 8
    - parity: none
    - stop bits: 1
    - timeout: 100

    Eu entrei em contato com o fornecedor para ver sobre a dll mas me falaram que tem que mandar um técnico na empresa para fazer um orçamento e que não disponibilizam nenhum arquivo dll e sim vendem o software da balança, mas o custo do software fica inviável já que o cliente quer o meu programa fazendo isso.
    Claudinei
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  Claudinei 16/7/2012, 15:39

    Seguinte galera do forum:
    Nosso amigo Lupe me passou um código que ele descobriu na net de um exemplo em VB com uma coleção de rotinas para executar os comandos da porta serial I/O sem usar o controle Microsoft Comm.
    Eu baixei o exemplo como está no site http://www.thescarms.com/vbasic/commio.aspx mas está dando o seguinte erro: (lembrando que ao depurar o código não dá nenhum erro)

    COM ERROR: ERROR(9): CommOpen - Subscrito fora do intervalo.

    Os procedimentos que fiz foram o seguinte:

    Criei o módulo abaixo com o seguinte código:

    Option Compare Database

    Option Explicit

    '-------------------------------------------------------------------------------
    ' modCOMM - Written by: David M. Hitchner
    '
    ' This VB module is a collection of routines to perform serial port I/O without
    ' using the Microsoft Comm Control component. This module uses the Windows API
    ' to perform the overlapped I/O operations necessary for serial communications.
    '
    ' The routine can handle up to 4 serial ports which are identified with a
    ' Port ID.
    '
    ' All routines (with the exception of CommRead and CommWrite) return an error
    ' code or 0 if no error occurs. The routine CommGetError can be used to get
    ' the complete error message.
    '-------------------------------------------------------------------------------

    '-------------------------------------------------------------------------------
    ' Public Constants
    '-------------------------------------------------------------------------------

    ' Output Control Lines (CommSetLine)
    Public Const LINE_BREAK = 1
    Public Const LINE_DTR = 2
    Public Const LINE_RTS = 3

    ' Input Control Lines (CommGetLine)
    Public Const LINE_CTS = &H10&
    Public Const LINE_DSR = &H20&
    Public Const LINE_RING = &H40&
    Public Const LINE_RLSD = &H80&
    Public Const LINE_CD = &H80&

    '-------------------------------------------------------------------------------
    ' System Constants
    '-------------------------------------------------------------------------------
    Private Const ERROR_IO_INCOMPLETE = 996&
    Private Const ERROR_IO_PENDING = 997
    Private Const GENERIC_READ = &H80000000
    Private Const GENERIC_WRITE = &H40000000
    Private Const FILE_ATTRIBUTE_NORMAL = &H80
    Private Const FILE_FLAG_OVERLAPPED = &H40000000
    Private Const FORMAT_MESSAGE_FROM_SYSTEM = &H1000
    Private Const OPEN_EXISTING = 3

    ' COMM Functions
    Private Const MS_CTS_ON = &H10&
    Private Const MS_DSR_ON = &H20&
    Private Const MS_RING_ON = &H40&
    Private Const MS_RLSD_ON = &H80&
    Private Const PURGE_RXABORT = &H2
    Private Const PURGE_RXCLEAR = &H8
    Private Const PURGE_TXABORT = &H1
    Private Const PURGE_TXCLEAR = &H4

    ' COMM Escape Functions
    Private Const CLRBREAK = 9
    Private Const CLRDTR = 6
    Private Const CLRRTS = 4
    Private Const SETBREAK = 8
    Private Const SETDTR = 5
    Private Const SETRTS = 3

    '-------------------------------------------------------------------------------
    ' System Structures
    '-------------------------------------------------------------------------------
    Private Type COMSTAT
    fBitFields As Long ' See Comment in Win32API.Txt
    cbInQue As Long
    cbOutQue As Long
    End Type

    Private Type COMMTIMEOUTS
    ReadIntervalTimeout As Long
    ReadTotalTimeoutMultiplier As Long
    ReadTotalTimeoutConstant As Long
    WriteTotalTimeoutMultiplier As Long
    WriteTotalTimeoutConstant As Long
    End Type

    '
    ' The DCB structure defines the control setting for a serial
    ' communications device.
    '
    Private Type DCB
    DCBlength As Long
    BaudRate As Long
    fBitFields As Long ' See Comments in Win32API.Txt
    wReserved As Integer
    XonLim As Integer
    XoffLim As Integer
    ByteSize As Byte
    Parity As Byte
    StopBits As Byte
    XonChar As Byte
    XoffChar As Byte
    ErrorChar As Byte
    EofChar As Byte
    EvtChar As Byte
    wReserved1 As Integer 'Reserved; Do Not Use
    End Type

    Private Type OVERLAPPED
    Internal As Long
    InternalHigh As Long
    offset As Long
    OffsetHigh As Long
    hEvent As Long
    End Type

    Private Type SECURITY_ATTRIBUTES
    nLength As Long
    lpSecurityDescriptor As Long
    bInheritHandle As Long
    End Type

    '-------------------------------------------------------------------------------
    ' System Functions
    '-------------------------------------------------------------------------------
    '
    ' Fills a specified DCB structure with values specified in
    ' a device-control string.
    '
    Declare Function BuildCommDCB Lib "kernel32" Alias "BuildCommDCBA" _
    (ByVal lpDef As String, lpDCB As DCB) As Long
    '
    ' Retrieves information about a communications error and reports
    ' the current status of a communications device. The function is
    ' called when a communications error occurs, and it clears the
    ' device's error flag to enable additional input and output
    ' (I/O) operations.
    '
    Declare Function ClearCommError Lib "kernel32" _
    (ByVal hFile As Long, lpErrors As Long, lpStat As COMSTAT) As Long
    '
    ' Closes an open communications device or file handle.
    '
    Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
    '
    ' Creates or opens a communications resource and returns a handle
    ' that can be used to access the resource.
    '
    Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" _
    (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, _
    ByVal dwShareMode As Long, lpSecurityAttributes As Any, _
    ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, _
    ByVal hTemplateFile As Long) As Long
    '
    ' Directs a specified communications device to perform a function.
    '
    Declare Function EscapeCommFunction Lib "kernel32" _
    (ByVal nCid As Long, ByVal nFunc As Long) As Long
    '
    ' Formats a message string such as an error string returned
    ' by anoher function.
    '
    Declare Function FormatMessage Lib "kernel32" Alias "FormatMessageA" _
    (ByVal dwFlags As Long, lpSource As Any, ByVal dwMessageId As Long, _
    ByVal dwLanguageId As Long, ByVal lpBuffer As String, ByVal nSize As Long, _
    Arguments As Long) As Long
    '
    ' Retrieves modem control-register values.
    '
    Declare Function GetCommModemStatus Lib "kernel32" _
    (ByVal hFile As Long, lpModemStat As Long) As Long
    '
    ' Retrieves the current control settings for a specified
    ' communications device.
    '
    Declare Function GetCommState Lib "kernel32" _
    (ByVal nCid As Long, lpDCB As DCB) As Long
    '
    ' Retrieves the calling thread's last-error code value.
    '
    Declare Function GetLastError Lib "kernel32" () As Long
    '
    ' Retrieves the results of an overlapped operation on the
    ' specified file, named pipe, or communications device.
    '
    Declare Function GetOverlappedResult Lib "kernel32" _
    (ByVal hFile As Long, lpOverlapped As OVERLAPPED, _
    lpNumberOfBytesTransferred As Long, ByVal bWait As Long) As Long
    '
    ' Discards all characters from the output or input buffer of a
    ' specified communications resource. It can also terminate
    ' pending read or write operations on the resource.
    '
    Declare Function PurgeComm Lib "kernel32" _
    (ByVal hFile As Long, ByVal dwFlags As Long) As Long
    '
    ' Reads data from a file, starting at the position indicated by the
    ' file pointer. After the read operation has been completed, the
    ' file pointer is adjusted by the number of bytes actually read,
    ' unless the file handle is created with the overlapped attribute.
    ' If the file handle is created for overlapped input and output
    ' (I/O), the application must adjust the position of the file pointer
    ' after the read operation.
    '
    Declare Function ReadFile Lib "kernel32" _
    (ByVal hFile As Long, ByVal lpBuffer As String, _
    ByVal nNumberOfBytesToRead As Long, ByRef lpNumberOfBytesRead As Long, _
    lpOverlapped As OVERLAPPED) As Long
    '
    ' Configures a communications device according to the specifications
    ' in a device-control block (a DCB structure). The function
    ' reinitializes all hardware and control settings, but it does not
    ' empty output or input queues.
    '
    Declare Function SetCommState Lib "kernel32" _
    (ByVal hCommDev As Long, lpDCB As DCB) As Long
    '
    ' Sets the time-out parameters for all read and write operations on a
    ' specified communications device.
    '
    Declare Function SetCommTimeouts Lib "kernel32" _
    (ByVal hFile As Long, lpCommTimeouts As COMMTIMEOUTS) As Long
    '
    ' Initializes the communications parameters for a specified
    ' communications device.
    '
    Declare Function SetupComm Lib "kernel32" _
    (ByVal hFile As Long, ByVal dwInQueue As Long, ByVal dwOutQueue As Long) As Long
    '
    ' Writes data to a file and is designed for both synchronous and a
    ' synchronous operation. The function starts writing data to the file
    ' at the position indicated by the file pointer. After the write
    ' operation has been completed, the file pointer is adjusted by the
    ' number of bytes actually written, except when the file is opened with
    ' FILE_FLAG_OVERLAPPED. If the file handle was created for overlapped
    ' input and output (I/O), the application must adjust the position of
    ' the file pointer after the write operation is finished.
    '
    Declare Function WriteFile Lib "kernel32" _
    (ByVal hFile As Long, ByVal lpBuffer As String, _
    ByVal nNumberOfBytesToWrite As Long, lpNumberOfBytesWritten As Long, _
    lpOverlapped As OVERLAPPED) As Long

    '-------------------------------------------------------------------------------
    ' Program Constants
    '-------------------------------------------------------------------------------

    Private Const MAX_PORTS = 4

    '-------------------------------------------------------------------------------
    ' Program Structures
    '-------------------------------------------------------------------------------

    Private Type COMM_ERROR
    lngErrorCode As Long
    strFunction As String
    strErrorMessage As String
    End Type

    Private Type COMM_PORT
    lngHandle As Long
    blnPortOpen As Boolean
    udtDCB As DCB
    End Type

    '-------------------------------------------------------------------------------
    ' Program Storage
    '-------------------------------------------------------------------------------

    Private udtCommOverlap As OVERLAPPED
    Private udtCommError As COMM_ERROR
    Private udtPorts(1 To MAX_PORTS) As COMM_PORT
    '-------------------------------------------------------------------------------
    ' GetSystemMessage - Gets system error text for the specified error code.
    '-------------------------------------------------------------------------------
    Public Function GetSystemMessage(lngErrorCode As Long) As String
    Dim intPos As Integer
    Dim strMessage As String, strMsgBuff As String * 256

    Call FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, 0, lngErrorCode, 0, strMsgBuff, 255, 0)

    intPos = InStr(1, strMsgBuff, vbNullChar)
    If intPos > 0 Then
    strMessage = Trim$(Left$(strMsgBuff, intPos - 1))
    Else
    strMessage = Trim$(strMsgBuff)
    End If

    GetSystemMessage = strMessage

    End Function


    '-------------------------------------------------------------------------------
    ' CommOpen - Opens/Initializes serial port.
    '
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' strPort - COM port name. (COM1, COM2, COM3, COM4)
    ' strSettings - Communication settings.
    ' Example: "baud=9600 parity=N data=8 stop=1"
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '
    '-------------------------------------------------------------------------------
    Public Function CommOpen(intPortID As Integer, strPort As String, _
    strSettings As String) As Long

    Dim lngStatus As Long
    Dim udtCommTimeOuts As COMMTIMEOUTS

    On Error GoTo Routine_Error

    ' See if port already in use.
    If udtPorts(intPortID).blnPortOpen Then
    lngStatus = -1
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommOpen"
    .strErrorMessage = "Port in use."
    End With

    GoTo Routine_Exit
    End If

    ' Open serial port.
    udtPorts(intPortID).lngHandle = CreateFile(strPort, GENERIC_READ Or _
    GENERIC_WRITE, 0, ByVal 0&, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)

    If udtPorts(intPortID).lngHandle = -1 Then
    lngStatus = SetCommError("CommOpen (CreateFile)")
    GoTo Routine_Exit
    End If

    udtPorts(intPortID).blnPortOpen = True

    ' Setup device buffers (1K each).
    lngStatus = SetupComm(udtPorts(intPortID).lngHandle, 1024, 1024)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (SetupComm)")
    GoTo Routine_Exit
    End If

    ' Purge buffers.
    lngStatus = PurgeComm(udtPorts(intPortID).lngHandle, PURGE_TXABORT Or _
    PURGE_RXABORT Or PURGE_TXCLEAR Or PURGE_RXCLEAR)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (PurgeComm)")
    GoTo Routine_Exit
    End If

    ' Set serial port timeouts.
    With udtCommTimeOuts
    .ReadIntervalTimeout = -1
    .ReadTotalTimeoutMultiplier = 0
    .ReadTotalTimeoutConstant = 1000
    .WriteTotalTimeoutMultiplier = 0
    .WriteTotalTimeoutMultiplier = 1000
    End With

    lngStatus = SetCommTimeouts(udtPorts(intPortID).lngHandle, udtCommTimeOuts)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (SetCommTimeouts)")
    GoTo Routine_Exit
    End If

    ' Get the current state (DCB).
    lngStatus = GetCommState(udtPorts(intPortID).lngHandle, _
    udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (GetCommState)")
    GoTo Routine_Exit
    End If

    ' Modify the DCB to reflect the desired settings.
    lngStatus = BuildCommDCB(strSettings, udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (BuildCommDCB)")
    GoTo Routine_Exit
    End If

    ' Set the new state.
    lngStatus = SetCommState(udtPorts(intPortID).lngHandle, _
    udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (SetCommState)")
    GoTo Routine_Exit
    End If

    lngStatus = 0

    Routine_Exit:
    CommOpen = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommOpen"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function


    Private Function SetCommError(strFunction As String) As Long

    With udtCommError
    .lngErrorCode = Err.LastDllError
    .strFunction = strFunction
    .strErrorMessage = GetSystemMessage(.lngErrorCode)
    SetCommError = .lngErrorCode
    End With

    End Function

    Private Function SetCommErrorEx(strFunction As String, lngHnd As Long) As Long
    Dim lngErrorFlags As Long
    Dim udtCommStat As COMSTAT

    With udtCommError
    .lngErrorCode = GetLastError
    .strFunction = strFunction
    .strErrorMessage = GetSystemMessage(.lngErrorCode)

    Call ClearCommError(lngHnd, lngErrorFlags, udtCommStat)

    .strErrorMessage = .strErrorMessage & " COMM Error Flags = " & _
    Hex$(lngErrorFlags)

    SetCommErrorEx = .lngErrorCode
    End With

    End Function

    '-------------------------------------------------------------------------------
    ' CommSet - Modifies the serial port settings.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' strSettings - Communication settings.
    ' Example: "baud=9600 parity=N data=8 stop=1"
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommSet(intPortID As Integer, strSettings As String) As Long

    Dim lngStatus As Long

    On Error GoTo Routine_Error

    lngStatus = GetCommState(udtPorts(intPortID).lngHandle, _
    udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommSet (GetCommState)")
    GoTo Routine_Exit
    End If

    lngStatus = BuildCommDCB(strSettings, udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommSet (BuildCommDCB)")
    GoTo Routine_Exit
    End If

    lngStatus = SetCommState(udtPorts(intPortID).lngHandle, _
    udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommSet (SetCommState)")
    GoTo Routine_Exit
    End If

    lngStatus = 0

    Routine_Exit:
    CommSet = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommSet"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommClose - Close the serial port.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommClose(intPortID As Integer) As Long

    Dim lngStatus As Long

    On Error GoTo Routine_Error

    If udtPorts(intPortID).blnPortOpen Then
    lngStatus = CloseHandle(udtPorts(intPortID).lngHandle)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommClose (CloseHandle)")
    GoTo Routine_Exit
    End If

    udtPorts(intPortID).blnPortOpen = False
    End If

    lngStatus = 0

    Routine_Exit:
    CommClose = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommClose"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommFlush - Flush the send and receive serial port buffers.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommFlush(intPortID As Integer) As Long

    Dim lngStatus As Long

    On Error GoTo Routine_Error

    lngStatus = PurgeComm(udtPorts(intPortID).lngHandle, PURGE_TXABORT Or _
    PURGE_RXABORT Or PURGE_TXCLEAR Or PURGE_RXCLEAR)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommFlush (PurgeComm)")
    GoTo Routine_Exit
    End If

    lngStatus = 0

    Routine_Exit:
    CommFlush = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommFlush"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommRead - Read serial port input buffer.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' strData - Data buffer.
    ' lngSize - Maximum number of bytes to be read.
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommRead(intPortID As Integer, strData As String, _
    lngSize As Long) As Long

    Dim lngStatus As Long
    Dim lngRdSize As Long, lngBytesRead As Long
    Dim lngRdStatus As Long, strRdBuffer As String * 1024
    Dim lngErrorFlags As Long, udtCommStat As COMSTAT

    On Error GoTo Routine_Error

    strData = ""
    lngBytesRead = 0
    DoEvents

    ' Clear any previous errors and get current status.
    lngStatus = ClearCommError(udtPorts(intPortID).lngHandle, lngErrorFlags, _
    udtCommStat)

    If lngStatus = 0 Then
    lngBytesRead = -1
    lngStatus = SetCommError("CommRead (ClearCommError)")
    GoTo Routine_Exit
    End If

    If udtCommStat.cbInQue > 0 Then
    If udtCommStat.cbInQue > lngSize Then
    lngRdSize = udtCommStat.cbInQue
    Else
    lngRdSize = lngSize
    End If
    Else
    lngRdSize = 0
    End If

    If lngRdSize Then
    lngRdStatus = ReadFile(udtPorts(intPortID).lngHandle, strRdBuffer, _
    lngRdSize, lngBytesRead, udtCommOverlap)

    If lngRdStatus = 0 Then
    lngStatus = GetLastError
    If lngStatus = ERROR_IO_PENDING Then
    ' Wait for read to complete.
    ' This function will timeout according to the
    ' COMMTIMEOUTS.ReadTotalTimeoutConstant variable.
    ' Every time it times out, check for port errors.

    ' Loop until operation is complete.
    While GetOverlappedResult(udtPorts(intPortID).lngHandle, _
    udtCommOverlap, lngBytesRead, True) = 0

    lngStatus = GetLastError

    If lngStatus <> ERROR_IO_INCOMPLETE Then
    lngBytesRead = -1
    lngStatus = SetCommErrorEx( _
    "CommRead (GetOverlappedResult)", _
    udtPorts(intPortID).lngHandle)
    GoTo Routine_Exit
    End If
    Wend
    Else
    ' Some other error occurred.
    lngBytesRead = -1
    lngStatus = SetCommErrorEx("CommRead (ReadFile)", _
    udtPorts(intPortID).lngHandle)
    GoTo Routine_Exit

    End If
    End If

    strData = Left$(strRdBuffer, lngBytesRead)
    End If

    Routine_Exit:
    CommRead = lngBytesRead
    Exit Function

    Routine_Error:
    lngBytesRead = -1
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommRead"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommWrite - Output data to the serial port.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' strData - Data to be transmitted.
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommWrite(intPortID As Integer, strData As String) As Long

    Dim i As Integer
    Dim lngStatus As Long, lngSize As Long
    Dim lngWrSize As Long, lngWrStatus As Long

    On Error GoTo Routine_Error

    ' Get the length of the data.
    lngSize = Len(strData)

    ' Output the data.
    lngWrStatus = WriteFile(udtPorts(intPortID).lngHandle, strData, lngSize, _
    lngWrSize, udtCommOverlap)

    ' Note that normally the following code will not execute because the driver
    ' caches write operations. Small I/O requests (up to several thousand bytes)
    ' will normally be accepted immediately and WriteFile will return true even
    ' though an overlapped operation was specified.

    DoEvents

    If lngWrStatus = 0 Then
    lngStatus = GetLastError
    If lngStatus = 0 Then
    GoTo Routine_Exit
    ElseIf lngStatus = ERROR_IO_PENDING Then
    ' We should wait for the completion of the write operation so we know
    ' if it worked or not.
    '
    ' This is only one way to do this. It might be beneficial to place the
    ' writing operation in a separate thread so that blocking on completion
    ' will not negatively affect the responsiveness of the UI.
    '
    ' If the write takes long enough to complete, this function will timeout
    ' according to the CommTimeOuts.WriteTotalTimeoutConstant variable.
    ' At that time we can check for errors and then wait some more.

    ' Loop until operation is complete.
    While GetOverlappedResult(udtPorts(intPortID).lngHandle, _
    udtCommOverlap, lngWrSize, True) = 0

    lngStatus = GetLastError

    If lngStatus <> ERROR_IO_INCOMPLETE Then
    lngStatus = SetCommErrorEx( _
    "CommWrite (GetOverlappedResult)", _
    udtPorts(intPortID).lngHandle)
    GoTo Routine_Exit
    End If
    Wend
    Else
    ' Some other error occurred.
    lngWrSize = -1

    lngStatus = SetCommErrorEx("CommWrite (WriteFile)", _
    udtPorts(intPortID).lngHandle)
    GoTo Routine_Exit

    End If
    End If

    For i = 1 To 10
    DoEvents
    Next

    Routine_Exit:
    CommWrite = lngWrSize
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommWrite"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommGetLine - Get the state of selected serial port control lines.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' intLine - Serial port line. CTS, DSR, RING, RLSD (CD)
    ' blnState - Returns state of line (Cleared or Set).
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommGetLine(intPortID As Integer, intLine As Integer, _
    blnState As Boolean) As Long

    Dim lngStatus As Long
    Dim lngComStatus As Long, lngModemStatus As Long

    On Error GoTo Routine_Error

    lngStatus = GetCommModemStatus(udtPorts(intPortID).lngHandle, lngModemStatus)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommReadCD (GetCommModemStatus)")
    GoTo Routine_Exit
    End If

    If (lngModemStatus And intLine) Then
    blnState = True
    Else
    blnState = False
    End If

    lngStatus = 0

    Routine_Exit:
    CommGetLine = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommReadCD"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommSetLine - Set the state of selected serial port control lines.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' intLine - Serial port line. BREAK, DTR, RTS
    ' Note: BREAK actually sets or clears a "break" condition on
    ' the transmit data line.
    ' blnState - Sets the state of line (Cleared or Set).
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommSetLine(intPortID As Integer, intLine As Integer, _
    blnState As Boolean) As Long

    Dim lngStatus As Long
    Dim lngNewState As Long

    On Error GoTo Routine_Error

    If intLine = LINE_BREAK Then
    If blnState Then
    lngNewState = SETBREAK
    Else
    lngNewState = CLRBREAK
    End If

    ElseIf intLine = LINE_DTR Then
    If blnState Then
    lngNewState = SETDTR
    Else
    lngNewState = CLRDTR
    End If

    ElseIf intLine = LINE_RTS Then
    If blnState Then
    lngNewState = SETRTS
    Else
    lngNewState = CLRRTS
    End If
    End If

    lngStatus = EscapeCommFunction(udtPorts(intPortID).lngHandle, lngNewState)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommSetLine (EscapeCommFunction)")
    GoTo Routine_Exit
    End If

    lngStatus = 0

    Routine_Exit:
    CommSetLine = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommSetLine"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function



    '-------------------------------------------------------------------------------
    ' CommGetError - Get the last serial port error message.
    '
    ' Parameters:
    ' strMessage - Error message from last serial port error.
    '
    ' Returns:
    ' Error Code - Last serial port error code.
    '-------------------------------------------------------------------------------
    Public Function CommGetError(strMessage As String) As Long

    With udtCommError
    CommGetError = .lngErrorCode
    strMessage = "Error (" & CStr(.lngErrorCode) & "): " & .strFunction & _
    " - " & .strErrorMessage
    End With

    End Function



    E no botão de comando do formulário para capturar o peso coloquei o seguinte código:

    Private Sub CapturarPeso_Click()
    Dim intPortID As Integer ' Ex. 1, 2, 3, 4 for COM1 - COM4
    Dim lngStatus As Long
    Dim strError As String
    Dim strData As String

    ' Initialize Communications
    lngStatus = CommOpen(intPortID, "COM" & CStr(intPortID), _
    "baud=9600 parity=N data=8 stop=1")

    If lngStatus <> 0 Then
    ' Handle error.
    lngStatus = CommGetError(strError)
    MsgBox "COM Error: " & strError
    End If

    ' Set modem control lines.
    lngStatus = CommSetLine(intPortID, LINE_RTS, True)
    lngStatus = CommSetLine(intPortID, LINE_DTR, True)

    ' Write data to serial port.
    lngSize = Len(strData)
    lngStatus = CommWrite(intPortID, strData)
    If lngStatus <> lngSize Then
    ' Handle error.
    End If


    ' Read maximum of 64 bytes from serial port.
    lngStatus = CommRead(intPortID, strData, 64)
    If lngStatus > 0 Then
    ' Process data.
    ElseIf lngStatus < 0 Then
    ' Handle error.
    End If

    ' Reset modem control lines.
    lngStatus = CommSetLine(intPortID, LINE_RTS, False)
    lngStatus = CommSetLine(intPortID, LINE_DTR, False)


    ' Close communications.
    Call CommClose(intPortID)
    End Sub


    Alguém pode me dar uma luz de onde está errado???
    HARYSOHN
    HARYSOHN
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  HARYSOHN 16/7/2012, 17:14

    Crie pontos de interrupção no código e veja em que linha ocorre o erro...

    Pode ser falta de alguma referencia.. ou mesmo realizando um evento sem antes setar alguma parte do código...


    Cumprimentos.
    Claudinei
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  Claudinei 16/7/2012, 17:25

    Ok Piloto, vou tentar fazer isso...

    Obrigado.
    Claudinei
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  Claudinei 16/7/2012, 19:07

    boa tarde Piloto.

    O erro está na 6ª linha do código do evento ao clicar do botão CapturarPeso onde está
    lngStatus = CommOpen(intPortID, "COM" & CStr(intPortID), _
    acho que é como se a porta COM estivesse fora do intervalo escrito no código, onde está apenas "COM" já alterei para "COM1", "COM2", "COM3" e "COM4" mas dá o mesmo erro...

    confused
    Jungli
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  Jungli 17/7/2012, 12:36

    Veja se da certo, usando uma dll do mesmo fabricante.
    Anexos
    [Resolvido] Capturar dados através da porta serial Attachmentlewin4.zip
    Você não tem permissão para fazer download dos arquivos anexados.
    (234 Kb) Baixado 156 vez(es)
    Claudinei
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  Claudinei 17/7/2012, 14:32

    bom dia meus amigos do fórum...

    Pelo visto esse tópico é um tanto complicado pois já faz um mês que estou varrendo a internet diariamente atrás de códigos ou dll's para resolver meu problema e acredito que de muita gente também.
    Ontem meu grande amigo LUPE, parceiro de longa data meu mandou um link de um site que está tudo mastigado...
    Acredito que será de grande valia para todos os membros do fórum já que ele lê e além disso escreve através das portas seriais.
    Para mim o código funcionou 100%...
    Segue o link--> http://dev.emcelettronica.com/serial-port-communication-excel-vba

    Mas chega de blábláblá e vamos ao que interessa...

    Crie um módulo em seu programa e cole o código abaixo:

    '-------------------------------------------------------------------------------
    '
    ' Este Módulo VB e UMA Coleção de rotinas parágrafo executar porta serial I / O sem
    ' usar o Componente Comm da Microsoft. Este Módulo usa uma API do Windows para
    ' executar as sobrepostas E / S e as operações necessárias para comunicação serial.
    '
    ' A rotina pode suportar até 4 portas seriais que são identificados com um ID da Porta.
    '
    ' Todas as rotinas (com exceção de CommRead e CommWrite) retornam um código de erro ou
    ' 0 se não ocorrer nenhum erro. O CommGetError rotina pode ser usada para obter
    ' a mensagem de erro completa.
    '-------------------------------------------------------------------------------
    ' Constantes públicas
    '-------------------------------------------------------------------------------

    ' Saída de Linhas de Controle (CommSetLine)
    Const LINE_BREAK = 1
    Const LINE_DTR = 2
    Const LINE_RTS = 3

    ' Entrada Linhas de Controle (CommGetLine)
    Const LINE_CTS = &H10&
    Const LINE_DSR = &H20&
    Const LINE_RING = &H40&
    Const LINE_RLSD = &H80&
    Const LINE_CD = &H80&

    '-------------------------------------------------------------------------------
    ' constantes do sistema
    '-------------------------------------------------------------------------------
    Private Const ERROR_IO_INCOMPLETE = 996&
    Private Const ERROR_IO_PENDING = 997
    Private Const GENERIC_READ = &H80000000
    Private Const GENERIC_WRITE = &H40000000
    Private Const FILE_ATTRIBUTE_NORMAL = &H80
    Private Const FILE_FLAG_OVERLAPPED = &H40000000
    Private Const FORMAT_MESSAGE_FROM_SYSTEM = &H1000
    Private Const OPEN_EXISTING = 3

    ' Funções COMM
    Private Const MS_CTS_ON = &H10&
    Private Const MS_DSR_ON = &H20&
    Private Const MS_RING_ON = &H40&
    Private Const MS_RLSD_ON = &H80&
    Private Const PURGE_RXABORT = &H2
    Private Const PURGE_RXCLEAR = &H8
    Private Const PURGE_TXABORT = &H1
    Private Const PURGE_TXCLEAR = &H4

    ' Fuga Funções COMM
    Private Const CLRBREAK = 9
    Private Const CLRDTR = 6
    Private Const CLRRTS = 4
    Private Const SETBREAK = 8
    Private Const SETDTR = 5
    Private Const SETRTS = 3

    '-------------------------------------------------------------------------------
    ' Estruturas do Sistema
    '-------------------------------------------------------------------------------
    Private Type COMSTAT
    fBitFields As Long ' Veja o comentário em Win32api.txt
    cbInQue As Long
    cbOutQue As Long
    End Type

    Private Type COMMTIMEOUTS
    ReadIntervalTimeout As Long
    ReadTotalTimeoutMultiplier As Long
    ReadTotalTimeoutConstant As Long
    WriteTotalTimeoutMultiplier As Long
    WriteTotalTimeoutConstant As Long
    End Type

    '
    ' A estrutura DCB define a configuração de controle para uma série
    ' Dispositivo de comunicação.'

    Private Type DCB
    DCBlength As Long
    BaudRate As Long
    fBitFields As Long ' Ver Comentários em Win32api.txt
    wReserved As Integer
    XonLim As Integer
    XoffLim As Integer
    ByteSize As Byte
    Parity As Byte
    StopBits As Byte
    XonChar As Byte
    XoffChar As Byte
    ErrorChar As Byte
    EofChar As Byte
    EvtChar As Byte
    wReserved1 As Integer 'Reservado, não use
    End Type

    Private Type OVERLAPPED
    Internal As Long
    InternalHigh As Long
    offset As Long
    OffsetHigh As Long
    hEvent As Long
    End Type

    Private Type SECURITY_ATTRIBUTES
    nLength As Long
    lpSecurityDescriptor As Long
    bInheritHandle As Long
    End Type

    '-------------------------------------------------------------------------------
    ' System Functions
    '-------------------------------------------------------------------------------
    '
    ' Fills a specified DCB structure with values specified in
    ' a device-control string.
    '
    Private Declare Function BuildCommDCB Lib "kernel32" Alias "BuildCommDCBA" _
    (ByVal lpDef As String, lpDCB As DCB) As Long
    '
    ' Retrieves information about a communications error and reports
    ' the current status of a communications device. The function is
    ' called when a communications error occurs, and it clears the
    ' device's error flag to enable additional input and output
    ' (I/O) operations.
    '
    Private Declare Function ClearCommError Lib "kernel32" _
    (ByVal hFile As Long, lpErrors As Long, lpStat As COMSTAT) As Long
    '
    ' Closes an open communications device or file handle.
    '
    Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
    '
    ' Creates or opens a communications resource and returns a handle
    ' that can be used to access the resource.
    '
    Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" _
    (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, _
    ByVal dwShareMode As Long, lpSecurityAttributes As Any, _
    ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, _
    ByVal hTemplateFile As Long) As Long
    '
    ' Directs a specified communications device to perform a function.
    '
    Private Declare Function EscapeCommFunction Lib "kernel32" _
    (ByVal nCid As Long, ByVal nFunc As Long) As Long
    '
    ' Formats a message string such as an error string returned
    ' by anoher function.
    '
    Private Declare Function FormatMessage Lib "kernel32" Alias "FormatMessageA" _
    (ByVal dwFlags As Long, lpSource As Any, ByVal dwMessageId As Long, _
    ByVal dwLanguageId As Long, ByVal lpBuffer As String, ByVal nSize As Long, _
    Arguments As Long) As Long
    '
    ' Retrieves modem control-register values.
    '
    Private Declare Function GetCommModemStatus Lib "kernel32" _
    (ByVal hFile As Long, lpModemStat As Long) As Long
    '
    ' Retrieves the current control settings for a specified
    ' communications device.
    '
    Private Declare Function GetCommState Lib "kernel32" _
    (ByVal nCid As Long, lpDCB As DCB) As Long
    '
    ' Retrieves the calling thread's last-error code value.
    '
    Private Declare Function GetLastError Lib "kernel32" () As Long
    '
    ' Retrieves the results of an overlapped operation on the
    ' specified file, named pipe, or communications device.
    '
    Private Declare Function GetOverlappedResult Lib "kernel32" _
    (ByVal hFile As Long, lpOverlapped As OVERLAPPED, _
    lpNumberOfBytesTransferred As Long, ByVal bWait As Long) As Long
    '
    ' Discards all characters from the output or input buffer of a
    ' specified communications resource. It can also terminate
    ' pending read or write operations on the resource.
    '
    Private Declare Function PurgeComm Lib "kernel32" _
    (ByVal hFile As Long, ByVal dwFlags As Long) As Long
    '
    ' Reads data from a file, starting at the position indicated by the
    ' file pointer. After the read operation has been completed, the
    ' file pointer is adjusted by the number of bytes actually read,
    ' unless the file handle is created with the overlapped attribute.
    ' If the file handle is created for overlapped input and output
    ' (I/O), the application must adjust the position of the file pointer
    ' after the read operation.
    '
    Private Declare Function ReadFile Lib "kernel32" _
    (ByVal hFile As Long, ByVal lpBuffer As String, _
    ByVal nNumberOfBytesToRead As Long, ByRef lpNumberOfBytesRead As Long, _
    lpOverlapped As OVERLAPPED) As Long
    '
    ' Configures a communications device according to the specifications
    ' in a device-control block (a DCB structure). The function
    ' reinitializes all hardware and control settings, but it does not
    ' empty output or input queues.
    '
    Private Declare Function SetCommState Lib "kernel32" _
    (ByVal hCommDev As Long, lpDCB As DCB) As Long
    '
    ' Sets the time-out parameters for all read and write operations on a
    ' specified communications device.
    '
    Private Declare Function SetCommTimeouts Lib "kernel32" _
    (ByVal hFile As Long, lpCommTimeouts As COMMTIMEOUTS) As Long
    '
    ' Initializes the communications parameters for a specified
    ' communications device.
    '
    Private Declare Function SetupComm Lib "kernel32" _
    (ByVal hFile As Long, ByVal dwInQueue As Long, ByVal dwOutQueue As Long) As Long
    '
    ' Writes data to a file and is designed for both synchronous and a
    ' synchronous operation. The function starts writing data to the file
    ' at the position indicated by the file pointer. After the write
    ' operation has been completed, the file pointer is adjusted by the
    ' number of bytes actually written, except when the file is opened with
    ' FILE_FLAG_OVERLAPPED. If the file handle was created for overlapped
    ' input and output (I/O), the application must adjust the position of
    ' the file pointer after the write operation is finished.
    '
    Private Declare Function WriteFile Lib "kernel32" _
    (ByVal hFile As Long, ByVal lpBuffer As String, _
    ByVal nNumberOfBytesToWrite As Long, lpNumberOfBytesWritten As Long, _
    lpOverlapped As OVERLAPPED) As Long


    Private Declare Sub AppSleep Lib "kernel32" Alias "Sleep" (ByVal dwMilliseconds As Long)
    '-------------------------------------------------------------------------------
    ' Program Constants
    '-------------------------------------------------------------------------------

    Private Const MAX_PORTS = 4

    '-------------------------------------------------------------------------------
    ' Program Structures
    '-------------------------------------------------------------------------------

    Private Type COMM_ERROR
    lngErrorCode As Long
    strFunction As String
    strErrorMessage As String
    End Type

    Private Type COMM_PORT
    lngHandle As Long
    blnPortOpen As Boolean
    udtDCB As DCB
    End Type



    '-------------------------------------------------------------------------------
    ' Program Storage
    '-------------------------------------------------------------------------------

    Private udtCommOverlap As OVERLAPPED
    Private udtCommError As COMM_ERROR
    Private udtPorts(1 To MAX_PORTS) As COMM_PORT
    '-------------------------------------------------------------------------------
    ' GetSystemMessage - Gets system error text for the specified error code.
    '-------------------------------------------------------------------------------
    Public Function GetSystemMessage(lngErrorCode As Long) As String
    Dim intPos As Integer
    Dim strMessage As String, strMsgBuff As String * 256

    Call FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, 0, lngErrorCode, 0, strMsgBuff, 255, 0)

    intPos = InStr(1, strMsgBuff, vbNullChar)
    If intPos > 0 Then
    strMessage = Trim$(Left$(strMsgBuff, intPos - 1))
    Else
    strMessage = Trim$(strMsgBuff)
    End If

    GetSystemMessage = strMessage

    End Function
    Public Function PauseApp(PauseInSeconds As Long)

    Call AppSleep(PauseInSeconds * 1000)

    End Function

    '-------------------------------------------------------------------------------
    ' CommOpen - Opens/Initializes serial port.
    '
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' strPort - COM port name. (COM1, COM2, COM3, COM4)
    ' strSettings - Communication settings.
    ' Example: "baud=9600 parity=N data=8 stop=1"
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '
    '-------------------------------------------------------------------------------
    Public Function CommOpen(intPortID As Integer, strPort As String, _
    strSettings As String) As Long

    Dim lngStatus As Long
    Dim udtCommTimeOuts As COMMTIMEOUTS

    On Error GoTo Routine_Error

    ' See if port already in use.
    If udtPorts(intPortID).blnPortOpen Then
    lngStatus = -1
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommOpen"
    .strErrorMessage = "Port in use."
    End With

    GoTo Routine_Exit
    End If

    ' Open serial port.
    udtPorts(intPortID).lngHandle = CreateFile(strPort, GENERIC_READ Or _
    GENERIC_WRITE, 0, ByVal 0&, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)

    If udtPorts(intPortID).lngHandle = -1 Then
    lngStatus = SetCommError("CommOpen (CreateFile)")
    GoTo Routine_Exit
    End If

    udtPorts(intPortID).blnPortOpen = True

    ' Setup device buffers (1K each).
    lngStatus = SetupComm(udtPorts(intPortID).lngHandle, 1024, 1024)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (SetupComm)")
    GoTo Routine_Exit
    End If

    ' Purge buffers.
    lngStatus = PurgeComm(udtPorts(intPortID).lngHandle, PURGE_TXABORT Or _
    PURGE_RXABORT Or PURGE_TXCLEAR Or PURGE_RXCLEAR)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (PurgeComm)")
    GoTo Routine_Exit
    End If

    ' Set serial port timeouts.
    With udtCommTimeOuts
    .ReadIntervalTimeout = -1
    .ReadTotalTimeoutMultiplier = 0
    .ReadTotalTimeoutConstant = 1000
    .WriteTotalTimeoutMultiplier = 0
    .WriteTotalTimeoutMultiplier = 1000
    End With

    lngStatus = SetCommTimeouts(udtPorts(intPortID).lngHandle, udtCommTimeOuts)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (SetCommTimeouts)")
    GoTo Routine_Exit
    End If

    ' Get the current state (DCB).
    lngStatus = GetCommState(udtPorts(intPortID).lngHandle, _
    udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (GetCommState)")
    GoTo Routine_Exit
    End If

    ' Modify the DCB to reflect the desired settings.
    lngStatus = BuildCommDCB(strSettings, udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (BuildCommDCB)")
    GoTo Routine_Exit
    End If

    ' Set the new state.
    lngStatus = SetCommState(udtPorts(intPortID).lngHandle, _
    udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommOpen (SetCommState)")
    GoTo Routine_Exit
    End If

    lngStatus = 0

    Routine_Exit:
    CommOpen = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommOpen"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function


    Private Function SetCommError(strFunction As String) As Long

    With udtCommError
    .lngErrorCode = Err.LastDllError
    .strFunction = strFunction
    .strErrorMessage = GetSystemMessage(.lngErrorCode)
    SetCommError = .lngErrorCode
    End With

    End Function

    Private Function SetCommErrorEx(strFunction As String, lngHnd As Long) As Long
    Dim lngErrorFlags As Long
    Dim udtCommStat As COMSTAT

    With udtCommError
    .lngErrorCode = GetLastError
    .strFunction = strFunction
    .strErrorMessage = GetSystemMessage(.lngErrorCode)

    Call ClearCommError(lngHnd, lngErrorFlags, udtCommStat)

    .strErrorMessage = .strErrorMessage & " COMM Error Flags = " & _
    Hex$(lngErrorFlags)

    SetCommErrorEx = .lngErrorCode
    End With

    End Function

    '-------------------------------------------------------------------------------
    ' CommSet - Modifies the serial port settings.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' strSettings - Communication settings.
    ' Example: "baud=9600 parity=N data=8 stop=1"
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommSet(intPortID As Integer, strSettings As String) As Long

    Dim lngStatus As Long

    On Error GoTo Routine_Error

    lngStatus = GetCommState(udtPorts(intPortID).lngHandle, _
    udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommSet (GetCommState)")
    GoTo Routine_Exit
    End If

    lngStatus = BuildCommDCB(strSettings, udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommSet (BuildCommDCB)")
    GoTo Routine_Exit
    End If

    lngStatus = SetCommState(udtPorts(intPortID).lngHandle, _
    udtPorts(intPortID).udtDCB)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommSet (SetCommState)")
    GoTo Routine_Exit
    End If

    lngStatus = 0

    Routine_Exit:
    CommSet = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommSet"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommClose - Close the serial port.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommClose(intPortID As Integer) As Long

    Dim lngStatus As Long

    On Error GoTo Routine_Error

    If udtPorts(intPortID).blnPortOpen Then
    lngStatus = CloseHandle(udtPorts(intPortID).lngHandle)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommClose (CloseHandle)")
    GoTo Routine_Exit
    End If

    udtPorts(intPortID).blnPortOpen = False
    End If

    lngStatus = 0

    Routine_Exit:
    CommClose = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommClose"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommFlush - Flush the send and receive serial port buffers.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommFlush(intPortID As Integer) As Long

    Dim lngStatus As Long

    On Error GoTo Routine_Error

    lngStatus = PurgeComm(udtPorts(intPortID).lngHandle, PURGE_TXABORT Or _
    PURGE_RXABORT Or PURGE_TXCLEAR Or PURGE_RXCLEAR)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommFlush (PurgeComm)")
    GoTo Routine_Exit
    End If

    lngStatus = 0

    Routine_Exit:
    CommFlush = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommFlush"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommRead - Read serial port input buffer.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' strData - Data buffer.
    ' lngSize - Maximum number of bytes to be read.
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommRead(intPortID As Integer, strData As String, _
    lngSize As Long) As Long

    Dim lngStatus As Long
    Dim lngRdSize As Long, lngBytesRead As Long
    Dim lngRdStatus As Long, strRdBuffer As String * 1024
    Dim lngErrorFlags As Long, udtCommStat As COMSTAT

    On Error GoTo Routine_Error

    strData = ""
    lngBytesRead = 0
    DoEvents

    ' Clear any previous errors and get current status.
    lngStatus = ClearCommError(udtPorts(intPortID).lngHandle, lngErrorFlags, _
    udtCommStat)

    If lngStatus = 0 Then
    lngBytesRead = -1
    lngStatus = SetCommError("CommRead (ClearCommError)")
    GoTo Routine_Exit
    End If

    If udtCommStat.cbInQue > 0 Then
    If udtCommStat.cbInQue > lngSize Then
    lngRdSize = udtCommStat.cbInQue
    Else
    lngRdSize = lngSize
    End If
    Else
    lngRdSize = 0
    End If

    If lngRdSize Then
    lngRdStatus = ReadFile(udtPorts(intPortID).lngHandle, strRdBuffer, _
    lngRdSize, lngBytesRead, udtCommOverlap)

    If lngRdStatus = 0 Then
    lngStatus = GetLastError
    If lngStatus = ERROR_IO_PENDING Then
    ' Wait for read to complete.
    ' This function will timeout according to the
    ' COMMTIMEOUTS.ReadTotalTimeoutConstant variable.
    ' Every time it times out, check for port errors.

    ' Loop until operation is complete.
    While GetOverlappedResult(udtPorts(intPortID).lngHandle, _
    udtCommOverlap, lngBytesRead, True) = 0

    lngStatus = GetLastError

    If lngStatus = ERROR_IO_INCOMPLETE Then
    lngBytesRead = -1
    lngStatus = SetCommErrorEx( _
    "CommRead (GetOverlappedResult)", _
    udtPorts(intPortID).lngHandle)
    GoTo Routine_Exit
    End If
    Wend
    Else
    ' Some other error occurred.
    lngBytesRead = -1
    lngStatus = SetCommErrorEx("CommRead (ReadFile)", _
    udtPorts(intPortID).lngHandle)
    GoTo Routine_Exit

    End If
    End If

    strData = Left$(strRdBuffer, lngBytesRead)
    End If

    Routine_Exit:
    CommRead = lngBytesRead
    Exit Function

    Routine_Error:
    lngBytesRead = -1
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommRead"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommWrite - Output data to the serial port.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' strData - Data to be transmitted.
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommWrite(intPortID As Integer, strData As String) As Long

    Dim i As Integer
    Dim lngStatus As Long, lngSize As Long
    Dim lngWrSize As Long, lngWrStatus As Long

    On Error GoTo Routine_Error

    ' Get the length of the data.
    lngSize = Len(strData)

    ' Output the data.
    lngWrStatus = WriteFile(udtPorts(intPortID).lngHandle, strData, lngSize, _
    lngWrSize, udtCommOverlap)

    ' Note that normally the following code will not execute because the driver
    ' caches write operations. Small I/O requests (up to several thousand bytes)
    ' will normally be accepted immediately and WriteFile will return true even
    ' though an overlapped operation was specified.

    DoEvents

    If lngWrStatus = 0 Then
    lngStatus = GetLastError
    If lngStatus = 0 Then
    GoTo Routine_Exit
    ElseIf lngStatus = ERROR_IO_PENDING Then
    ' We should wait for the completion of the write operation so we know
    ' if it worked or not.
    '
    ' This is only one way to do this. It might be beneficial to place the
    ' writing operation in a separate thread so that blocking on completion
    ' will not negatively affect the responsiveness of the UI.
    '
    ' If the write takes long enough to complete, this function will timeout
    ' according to the CommTimeOuts.WriteTotalTimeoutConstant variable.
    ' At that time we can check for errors and then wait some more.

    ' Loop until operation is complete.
    While GetOverlappedResult(udtPorts(intPortID).lngHandle, _
    udtCommOverlap, lngWrSize, True) = 0

    lngStatus = GetLastError

    If lngStatus = ERROR_IO_INCOMPLETE Then
    lngStatus = SetCommErrorEx( _
    "CommWrite (GetOverlappedResult)", _
    udtPorts(intPortID).lngHandle)
    GoTo Routine_Exit
    End If
    Wend
    Else
    ' Some other error occurred.
    lngWrSize = -1

    lngStatus = SetCommErrorEx("CommWrite (WriteFile)", _
    udtPorts(intPortID).lngHandle)
    GoTo Routine_Exit

    End If
    End If

    For i = 1 To 10
    DoEvents
    Next

    Routine_Exit:
    CommWrite = lngWrSize
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommWrite"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommGetLine - Get the state of selected serial port control lines.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' intLine - Serial port line. CTS, DSR, RING, RLSD (CD)
    ' blnState - Returns state of line (Cleared or Set).
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommGetLine(intPortID As Integer, intLine As Integer, _
    blnState As Boolean) As Long

    Dim lngStatus As Long
    Dim lngComStatus As Long, lngModemStatus As Long

    On Error GoTo Routine_Error

    lngStatus = GetCommModemStatus(udtPorts(intPortID).lngHandle, lngModemStatus)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommReadCD (GetCommModemStatus)")
    GoTo Routine_Exit
    End If

    If (lngModemStatus And intLine) Then
    blnState = True
    Else
    blnState = False
    End If

    lngStatus = 0

    Routine_Exit:
    CommGetLine = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommReadCD"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function

    '-------------------------------------------------------------------------------
    ' CommSetLine - Set the state of selected serial port control lines.
    '
    ' Parameters:
    ' intPortID - Port ID used when port was opened.
    ' intLine - Serial port line. BREAK, DTR, RTS
    ' Note: BREAK actually sets or clears a "break" condition on
    ' the transmit data line.
    ' blnState - Sets the state of line (Cleared or Set).
    '
    ' Returns:
    ' Error Code - 0 = No Error.
    '-------------------------------------------------------------------------------
    Public Function CommSetLine(intPortID As Integer, intLine As Integer, _
    blnState As Boolean) As Long

    Dim lngStatus As Long
    Dim lngNewState As Long

    On Error GoTo Routine_Error

    If intLine = LINE_BREAK Then
    If blnState Then
    lngNewState = SETBREAK
    Else
    lngNewState = CLRBREAK
    End If

    ElseIf intLine = LINE_DTR Then
    If blnState Then
    lngNewState = SETDTR
    Else
    lngNewState = CLRDTR
    End If

    ElseIf intLine = LINE_RTS Then
    If blnState Then
    lngNewState = SETRTS
    Else
    lngNewState = CLRRTS
    End If
    End If

    lngStatus = EscapeCommFunction(udtPorts(intPortID).lngHandle, lngNewState)

    If lngStatus = 0 Then
    lngStatus = SetCommError("CommSetLine (EscapeCommFunction)")
    GoTo Routine_Exit
    End If

    lngStatus = 0

    Routine_Exit:
    CommSetLine = lngStatus
    Exit Function

    Routine_Error:
    lngStatus = Err.Number
    With udtCommError
    .lngErrorCode = lngStatus
    .strFunction = "CommSetLine"
    .strErrorMessage = Err.Description
    End With
    Resume Routine_Exit
    End Function



    '-------------------------------------------------------------------------------
    ' CommGetError - Get the last serial port error message.
    '
    ' Parameters:
    ' strMessage - Error message from last serial port error.
    '
    ' Returns:
    ' Error Code - Last serial port error code.
    '-------------------------------------------------------------------------------
    Public Function CommGetError(strMessage As String) As Long

    With udtCommError
    CommGetError = .lngErrorCode
    strMessage = "Error (" & CStr(.lngErrorCode) & "): " & .strFunction & _
    " - " & .strErrorMessage
    End With
    End Function

    No evento ao carregar do form onde se deseja capturar os dados eu usei o seguinte código:

    Dim intPortID As Integer ' Ex. 1, 2, 3, 4 for COM1 - COM4
    Dim lngStatus As Long

    intPortID = 4

    ' Open COM port
    lngStatus = CommOpen(intPortID, "COM" & CStr(intPortID), "baud=9600 parity=N data=8 stop=1")

    No evento ao clicar do botão:
    Dim intPortID As Integer ' Ex. 1, 2, 3, 4 for COM1 - COM4
    Dim lngStatus As Long
    Dim strData As String

    intPortID = 4
    lngStatus = CommRead(intPortID, strData, 10)
    Me.[seu_campo_no_form] = strData

    No evento ao sair do form:
    Dim intPortID As Integer ' Ex. 1, 2, 3, 4 for COM1 - COM4
    intPortID = 4
    Call CommClose(intPortID)

    DoCmd.Save

    Só uma observação:
    No site vcs irão perceber que o CommandButton2 escreve ao invés de ler na porta COM.

    Bem amigos, espero que seja de grande valia para todos do fórum pois esse problema me deixou de cabelos em pé durente quase dois meses...

    Abraço a todos e especialmente ao meu amigo LUPE que perdeu uns dias de seu tempo me ajudando a varrer a internet atrás desse código pra resolver meu problema.

    Claudinei
    Claudinei
    Intermediário
    Intermediário


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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  Claudinei 17/7/2012, 14:36

    Obrigado Jungli mas essa dll também não resolveu meu problema eu programei usando ela, e dá o seguinte erro:

    Erro 4 - Nenhum dado enviado pelo SP-2400. Isto pode ocorrer devido a instabilidade do peso (tente ler novamente) ou erro na conexão dos cabos.

    Acho que tenho todas as dll's das imagináveis mas nenhuma que fizesse o trabalho que o código acima me proporcionou.

    Obrigado pela ajuda!
    HARYSOHN
    HARYSOHN
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  HARYSOHN 17/7/2012, 17:33

    Boas Claudinei, que bom que resolveste. Agradeceriamos se postase um exemplo conciso do bd com os modulos e forms envolvidos.


    O Fórum Agradece o retorno.
    Claudinei
    Claudinei
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    [Resolvido] Capturar dados através da porta serial Empty Re: [Resolvido] Capturar dados através da porta serial

    Mensagem  Claudinei 17/7/2012, 18:20

    Boa tarde Piloto...

    Não sei se vc viu mas deixei o exemplo logo acima pra galera...
    Quanto ao arquivo de exemplo vou elaborar e postar pra galera também...

    Abraço e obrigado pela ajuda dada !
    avatar
    Vinirz
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    [Resolvido] Capturar dados através da porta serial Empty BJ850

    Mensagem  Vinirz 11/7/2022, 20:02

    Olá Claudinei, tudo bem?

    Estou com o mesmo problema aqui, gostaria de capturar as pesagens no pc e através do pc dar os comandos F1 e etc, e salvar os dados um uma planilha excel para poder editar e a partir dali imprimir ou salvar o arquivo...

      Data/hora atual: 6/10/2022, 07:54