串口异步通信问题

Question

不知如何在主线程中读串口数据
   while(!b_resive)
{

if (!ReadFile(m_hCom, AcceptCode, 3,&nRealRead, &wrOverlapped)) 
{
if (GetLastError() == ERROR_IO_PENDING)
{
while(!GetOverlappedResult(m_hCom,
&wrOverlapped, &nRealRead, TRUE ))
{
dwError = GetLastError();
if(dwError == ERROR_IO_INCOMPLETE)
continue; 
else
{
ClearCommError( m_hCom, 
&dwErrorFlags, &ComStat ) ; 
break;
}
}
}
}
}
AcceptCode中收不到正确值!

Answer 1

首先要等待事件呀
while(1)
{
::WaitForSingleObject(g_event,INFINITE);
TRACE("fuck\n");
        if(WaitCommEvent(hCom,&lpEvmsk,NULL))
{
if(lpEvmsk==EV_RXCHAR)
{
ClearCommError(hCom,&dwError,&comstat);
if(comstat.cbInQue>0)
{
dwLength=comstat.cbInQue;
  ReadFilehCom,ch,dwLength,&dwLength,&m_oRead);
ch[dwLength]='\0';
str=ch;
TRACE("%s",str);
::SendMessage(hWnd,WM_PAINT,0,0);
str=_T("");
}
}
}
}

Answer 2

你的g_event是哪个事件！我是想接收数据！

Answer 3

EV_RXCHAR就是串口接收BUF接收到字符后相应的事件

Answer 4

我的g_event为写的事件，如果你不用异步方式
可以省去