Sending a defined bit stream through the serial port (VC++ 6.0)

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Sat, 29 Jul 2006 03:17:01 -0700

I have written a VC++ 6.0 program to send data through the serial port.I
have successfully sent the ASCII characters using my code.But now I need to
send defined block of bits (eg. "1100110") through the serial port.Is it
possible. Also if there is any problem I can add some overhead bits and make
the number of bit to 8 so that it can be defined as a byte,

I will be really happy if someone of you can help me regarding the above
matter.For your conveience I have given below some parts (open port and
sending data) of the code that I am using.

//To open the port and Configure

HANDLE handlePort_; // the object that is a instace of port.
DCB config_1;

BOOL openPt(BOOL statusPort_1,const char* portName)

 // Defaults
 config_1.ByteSize = 8; // Byte of the Data.
 config_1.StopBits = ONESTOPBIT; // Use one bit for stopbit.
 config_1.Parity = NOPARITY; // No parity bit
 config_1.BaudRate = CBR_9600; // Buadrate 9600 bit/sec

 if (statusPort_1 == FALSE) // if port is opened already, not open port

   handlePort_ = CreateFile(portName, // Specify port device: default "COM1"
           GENERIC_READ | GENERIC_WRITE, // Specify mode that open
            0, // the devide isn't shared.
            NULL, // the object gets a default
           OPEN_EXISTING, // Specify which action to
take on file.
           0, // default.
          NULL); // default.-

    // Get current configuration of serial communication port.
    if (GetCommState(handlePort_,&config_1) == 0)
      AfxMessageBox("Problem occured in configuration.");
      return FALSE;


 config_1.ByteSize = 8; // Byte of the Data.
 config_1.StopBits = ONESTOPBIT; // Use one bit for stopbit.
 config_1.Parity = NOPARITY; // No parity bit
 config_1.BaudRate = CBR_1200; // Buadrate 1200 bit/sec

 // Set current configuration of serial communication port.
    if (SetCommState(handlePort_,&config_1) == 0)
       AfxMessageBox("Set configuration port has problem.");
       return FALSE;
        // instance an object of COMMTIMEOUTS.
    COMMTIMEOUTS comTimeOut;
    // Specify time-out between charactor for receiving.
    comTimeOut.ReadIntervalTimeout = 3;
      comTimeOut.ReadTotalTimeoutMultiplier = 3;
      comTimeOut.ReadTotalTimeoutConstant = 2;
       comTimeOut.WriteTotalTimeoutMultiplier = 0;
       comTimeOut.WriteTotalTimeoutConstant = 0;
    // Updata port's status.
    return TRUE;
     AfxMessageBox("Port is Already Opened");
     return TRUE;


// to write data to the port

void writePort(LPCVOID outputData,
                     const unsigned int& sizeBuffer,
                     unsigned long& length)

  if (length > 0)

    if (WriteFile(handlePort_, // handle to file to write to
      outputData, // pointer to data to write to file
      sizeBuffer, // number of bytes to write
      &length,NULL) == 0) // pointer to number of bytes written
      AfxMessageBox("writing of serial communication has problem.");


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