d198.bmp.txt

Visual C++通信编程实例

198
BOOL CYsComm::DoStateEvent(DWORD dwEvtMask)
{
if(dwEvtMask=NULL) return TRUE;
//dwEvtMask可能会为NULL
    if (dwEvtMask& EV_BREAK)／／检测到转入的中止
    {
    if(m_hWnd)
    PostMessage(m_hWnd,WM_YSCOMM_MES SAGE,WM_EV_BREAK,m_nPor0;
    )
    if (dwEvtMask& EV_CTS) //CTS（清除发送）信号改变状态
    {
    if(m_hWnd)
    PostMessage(m_hWnd,WM_YSCOMM_MES SAGE,WM_EV_CTS,m_nPor0;
    )
    if (dwEvtMask& EV_DSR) //DSR（数据设置就绪）信号改变状态
    {
    if(m_hWnd)
    PostMessage(m_hWnd,WM_YS COMM_MES SAGE,WM_EV_DSR,m_nPort);
    )
    if (dwEvtMask& EV_ERR)，，发生线路状态错误
    {
    if(m_hWnd)
    PostMessage(m_hWnd,WM_YSCOMM_MESS AGE,WM_EV_ERR,m_nPor0;
    }
    if (dwEvtMask& EV_RING)//栓测到振铃
    {
    if(m_hWnd)
    PostMessage(m_hWnd,WM_YS COMM_MESS AGE,WM_EV_RING,m_nPor0;
    )
    if (dwEvtMask＆EV_RLSD)//RLSD(接收线路信号检测)信号改变状态
    {
    if(m_hWnd)
    PostMessage(m_hWnd,WM_YS COMM_MESS AGE,WM_EV_RLS D,m_nPort);
    }
    if (dwEvtMask& EV_RXCHAR)//收到一个字符，并放入输入缓冲区
    {
    if(m_hWnd)
    PostMessage(m_hWnd,WM_YSCOMM_MESS AGE,WM_EV_RXCHAR,m_nPort);
    )
    if (dwEvtMask& EV_RXFIAG)删妊0事件字符(DCB结构的EvtChar成员)，并放入输入缓冲区
    (
    if(m_hWnd)
    PostMessage(m_hWnd,WM_YS COMM_MES SAGE,WM_EV_RXFLAG,m_nPor0;
    )
    if (dwEvtMask& EV_TXEMPTY)，辟俞出缓冲区最后一个字符发送出去
    {