VC++串口编程求助。。。。。

Question

非常著名的serialport类中有这么一段代码：
bResult = WaitCommEvent(port->m_hComm, &Event, &port->m_ov);

    if (!bResult)  
    { 
        // If WaitCommEvent() returns FALSE, process the last error to determin
        switch (dwError = GetLastError()) 
        { 
        case ERROR_IO_PENDING:     
            { 
                break;
            }
        case 87:
            {
                break;
            }
        default:
            {
                port->ProcessErrorMessage("WaitCommEvent()");
                break;
            }
        }
    }
    else
    {

        bResult = ClearCommError(port->m_hComm, &dwError, &comstat);

        if (comstat.cbInQue == 0)
            continue;
    }    // end if bResult

        //m_hEventArray[0] = m_hShutdownEvent;    // highest priority
        //m_hEventArray[1] = m_ov.hEvent;
        //m_hEventArray[2] = m_hWriteEvent;
    Event = WaitForMultipleObjects(3, port->m_hEventArray, FALSE, INFINITE);

    switch (Event)
    {
    case 0:
        {
            // Shutdown event.  This is event zero so it will be// the higest priority and be serviced first.                
            CloseHandle(port->m_hComm);
            port->m_hComm=NULL;
            port->m_bThreadAlive = FALSE;                
            // Kill this thread.  break is not needed, but makes me feel better.
            AfxEndThread(100);

            break;
        }
    case 1:    // read event
        {
            GetCommMask(port->m_hComm, &CommEvent);
            if (CommEvent & EV_RXCHAR)
                // Receive character event from port.
                ReceiveChar(port, comstat);
            if (CommEvent & EV_CTS)
                ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_CTS_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
            if (CommEvent & EV_BREAK)
                ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_BREAK_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
            if (CommEvent & EV_ERR)
                ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_ERR_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
            if (CommEvent & EV_RING)
                ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_RING_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);

            if (CommEvent & EV_RXFLAG)
                ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_RXFLAG_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);

            break;
        }  
    case 2: // write event
        {
            // Write character event from port
            WriteChar(port);
            break;
        }

    } // end switch

} // close forever loop
    小弟不太明白overlapped中的hEvent的置位和复位时如何实现的呢？是人工置位复位还是自动置位复位呢 求指教

Answer 1

用vc++编写上位机：
 
一是利用Windows API通信函数；二是利用VC的标准通信
函数inp、inpw、inpd、outp、outpw、outpd等直接对串口进行操作；三是使用Microsoft Visual C++的通信控件（MSComm）；
四是利用第三方编写的通信类。以上几种方法中第一种使用面较广，但由于比较复杂，专业化程度较高，使用较困难；第二种需要了
......
答案就在这里：vc++ 串口编程
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