d053.bmp.txt

Visual C++通信编程工程实例精解(附盘)

，，辅助线程，负责监视串行口
UINT CommProc(LPVOID pParam)
{
    OVERLAPPED os;
    DWORD dwMask, dwTrans;
    COMSTAT ComStat;
    DWORD dwErrorFlags;
    CTermDoc *pDoc=(CTermDoc*)pParam;
    memset(&os,0, sizeof(OVERLAPPED》;
    os.hEvent;CreateEvent(NULL, TRUE, FALSE, NULL);
    if(os.hEvent==NULL)
    {
    AfxMessageBox(”无法创建事件对象%
    return (UINT)-1;
    }
while(pDoc->m_bConnected)
{
    ClearCommError(pDoc->m_hCom,&dwErrorFlags,&ComStat);
    if(ComStat.cblnQue)
    {
    ，，无限等待WM_COMMNOTIFY消息被处理完
    WaitForSingleObj ect(pDoc->m_hPostMsgEvent,  INFINITE);
    ResetEvent(pDoc->m_hPostMsgEvent);
    ，，通知视图，有字符到
    PostMessage(pDoc->m__ hTermWnd,WM_COMMNOTIFY,EV. RXCHAR,O);
    continue,
    }
    dwMask=0;
    if(! WaitCommEvent(pDoc->m_hCom,&dwMask, &os》，，重叠操作
    {
    if(GetLastError()-ERROR_IO_PENDING)
    ，，无限等待重叠操作结果
    GetOverlappedResult(pDoc->m_hCoW &os, &dwTrans, TRUE);
    else
    {
    CloseHandle(os.hEvent);
    retum (UINT)-1;
    )
    }
】
CloseHandle(os.hEvent);
retum0：
OnNewDocument成员函数创建3个事件对象：
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