用API 写串口通讯出现ReadComm()不执行，事件消息我写好了，不明白为什么会出问题

fish861221
鱼骨头
等级:

发表于：2008-05-21 22:29:263楼得分:0

下面是我线程的代码

UINT CommProc(LPVOID pParam)
{
OVERLAPPED os;
DWORD dwMask,dwTrans;
COMSTAT ComStat;
DWORD dwErrorFlags;

CTTYDoc *pDoc=(CTTYDoc*)pParam;
memset(&os,0,sizeof(OVERLAPPED));
os.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);

if(os.hEvent=NULL)
{
AfxMessageBox("can't creat event object");
return (UINT)-1;
}

while(pDoc->m_bConnected)
{
ClearCommError(pDoc->m_hCom,&dwErrorFlags,&ComStat);
if(ComStat.cbInQue)
{
WaitForSingleObject(pDoc->m_hPostMsgEvent,INFINITE);
ResetEvent(pDoc->m_hPostMsgEvent);
PostMessage(pDoc->m_hTermWnd,WM_COMMNOTIFY,EV_RXCHAR,0);
continue;
}
dwMask=0;
if(!WaitCommEvent(pDoc->m_hCom,&dwMask,&os))
{
if(GetLastError()==ERROR_IO_PENDING)
GetOverlappedResult(pDoc->m_hCom,&os,&dwTrans,TRUE);
else
{
CloseHandle(os.hEvent);
return (UINT)-1;
}
}
}
CloseHandle(os.hEvent);
return 0;
}
消息是

LRESULT CTTYView::OnCommNotify(WPARAM wParam,LPARAM lParam)
{
char buf[MAXBLOCK/4];
CString str;
int nLength,nTextLength;
CTTYDoc* pDoc=GetDocument();

CEdit &edit=GetEditCtrl();

if(!pDoc->m_bConnected ¦ ¦(wParam&EV_RXCHAR)!=EV_RXCHAR)
{
SetEvent(pDoc->m_hPostMsgEvent);
return 0L;
}
nLength=pDoc->ReadComm(buf,100);
if(nLength)
{
nTextLength=edit.GetWindowTextLength();
edit.SetSel(nTextLength,nTextLength);

for(int i=0;i <nLength;i++)
{
switch(buf[i])
{
case '\r':
if(!pDoc->m_bNewLine)
break;
case '\n':
str+="\r\n";
break;
case '\b':
edit.SetSel(-1,0);
edit.ReplaceSel(str);
nTextLength=edit.GetWindowTextLength();
edit.SetSel(nTextLength-1,nTextLength);
edit.ReplaceSel("");
str="";
break;
case '\a':
MessageBeep((UINT)-1);
break;
default:
str==buf[i];
}
}
edit.SetSel(-1,0);
edit.ReplaceSel(str);
}
SetEvent(pDoc->m_hPostMsgEvent);
return 0L;
}
帮我看看会是什么问题大概如果有兴趣的请留下E -Mail我发代码给你谢谢各位了

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