Связь по COM порту - C/C++ - Ответ 4927431

BOOL m_bPortReady2 = TRUE; // всё OK
    m_hCom = CreateFile(m_sComPort,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL); // null template
    
    overlapped.hEvent = CreateEvent(NULL, true, true, NULL);
    SetCommMask(m_hCom, EV_RXCHAR);
 
    if (m_hCom == INVALID_HANDLE_VALUE)
    {
        m_bPortReady2 = FALSE;
        dwError = GetLastError();
        LPVOID lpMsgBuf;
        lpMsgBuf = NULL;
        dwRC = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,NULL,dwError,MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),(LPTSTR) &lpMsgBuf,0,NULL);
        if (dwRC && lpMsgBuf)
        {
            CString str;str.Format("COM open failed: Port=%s Error=%d - %s",m_sComPort.GetBuffer(), dwError,(char*)lpMsgBuf);
            m_pDlg->SetLog(str);
        }
        else
        {
            CString str;str.Format("COM open failed: Port=%s Error=%d ",m_sComPort.GetBuffer(), dwError);
            m_pDlg->SetLog(str);
        } 
        if (dwRC && lpMsgBuf){LocalFree( lpMsgBuf );}
    } 
    if (m_bPortReady2)//Устанавливаем размеры буферов
    {
        m_bPortReady2 = SetupComm(m_hCom,1600, 1600);
        
        if (!m_bPortReady2)
        {
            dwError = GetLastError();
            CString str;str.Format("SetupComm failed: Port=%s Error=%d",m_sComPort.GetBuffer(), dwError);
            m_pDlg->SetLog(str);
        } 
    } 
    if (m_bPortReady2)//Читаем структуру параметров
    {
        m_bPortReady2 = GetCommState(m_hCom, &m_dcb);
        if (!m_bPortReady2)
        {
            dwError = GetLastError();
            CString str;str.Format("GetCommState failed: Port=%s Error=%d",m_sComPort.GetBuffer(), dwError);
            m_pDlg->SetLog(str);
        } 
    } 
    if (m_bPortReady2)//Устанавливаем структуру параметров
    {
 
            m_dcb.BaudRate = 115200;
            m_dcb.ByteSize = 8;
            m_dcb.Parity = NOPARITY;
            m_dcb.StopBits = ONESTOPBIT;
            m_dcb.fAbortOnError = FALSE;
        
 
        m_bPortReady2 = SetCommState(m_hCom, &m_dcb);
        if (!m_bPortReady2)
        {
            dwError = GetLastError();
            CString str;str.Format("SetCommState failed: Port=%s Error = %d",m_sComPort.GetBuffer(), dwError);
            m_pDlg->SetLog(str);
        }
    } 
    if (m_bPortReady2)//Читаем таймауты
    {
        m_bPortReady2 = GetCommTimeouts(m_hCom, &m_CommTimeouts);
        if (!m_bPortReady2)
        {
            dwError = GetLastError();
            CString str;str.Format("GetCommTimeouts failed: Port=%s Error = %d",m_sComPort.GetBuffer(), dwError);
            m_pDlg->SetLog(str);
        } 
        
            m_CommTimeouts.ReadIntervalTimeout = MAXDWORD;
            m_CommTimeouts.ReadTotalTimeoutConstant = 10;
            m_CommTimeouts.ReadTotalTimeoutMultiplier = 10;//0
            m_CommTimeouts.WriteTotalTimeoutConstant = 5;//5
            m_CommTimeouts.WriteTotalTimeoutMultiplier = 5;//5
        
        m_bPortReady2 = SetCommTimeouts (m_hCom, &m_CommTimeouts);
        if (!m_bPortReady2)
        {
            dwError = GetLastError();
            CString str;str.Format("SetCommTimeouts failed: Port=%s Error = %d",m_sComPort.GetBuffer(), dwError);
            m_pDlg->SetLog(str);
        } 
 
    }
    BOOL mask=SetCommMask(m_hCom, EV_RXCHAR);
    overlappedwr.InternalHigh=0;
    overlappedwr.Offset=0;
    overlappedwr.OffsetHigh=0;
 
    overlapped.InternalHigh=0;
    overlapped.Offset=0;
    overlapped.OffsetHigh=0;
 
    overlappedwr.hEvent = CreateEvent(NULL, true, true, NULL);
 
        if (m_bPortReady2==TRUE) {PurgeComm(m_hCom, PURGE_RXCLEAR);m_bPortReady =TRUE; return TRUE;}
    else {m_bPortReady =FALSE; return FALSE;}