改过拉还是不对，线程读数据的问题

[yyz2000]

初始化部分
DCB dcb;
COMMTIMEOUTS TimeOuts;
hComDev=CreateFile("COM1",GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,NULL);
if(hComDev==INVALID_HANDLE_VALUE)
{

AfxMessageBox("串口错误");
}
SetupComm(hComDev,1024,1024);
GetCommState(hComDev,&dcb);
dcb.BaudRate=CBR_9600;
dcb.fParity=NOPARITY;
dcb.ByteSize=8;
dcb.StopBits=ONESTOPBIT;
SetCommMask(hComDev,EV_ERR|EV_RXCHAR);
PurgeComm(hComDev, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR );
SetCommState(hComDev,&dcb);
TimeOuts.ReadIntervalTimeout=0xFFFFFFFF;
TimeOuts.ReadTotalTimeoutMultiplier=0;
TimeOuts.ReadTotalTimeoutConstant=1000;
TimeOuts.WriteTotalTimeoutMultiplier=2*9600/dcb.BaudRate ;
TimeOuts.WriteTotalTimeoutConstant=25;
SetCommTimeouts(hComDev,&TimeOuts);
CEdit*edt1=(CEdit*)GetDlgItem(IDC_EDIT2);
SetCommMask( hComDev, EV_RXCHAR );
m_pThread=AfxBeginThread(CommProc,(LPVOID)edt1, THREAD_PRIORITY_NORMAL, 0,0, NULL);
线程读数据部分
UINT CommProc(LPVOID pParam)
{
DWORD dwEvtMask ;
DWORD length;
char buf[200]={0};
CString sss;
COMSTAT ComStat;
DWORD dwErrorFlags;
OVERLAPPED m_osRead={0};
// SetCommMask( hComDev, EV_RXCHAR );

for( ; ;)
{
char buf[200]={0};
dwEvtMask = 0;
WaitCommEvent( hComDev, &dwEvtMask, NULL );
if ((dwEvtMask & EV_RXCHAR) == EV_RXCHAR)
{
ClearCommError(hComDev,&dwErrorFlags,&ComStat);
length=min(255, ComStat.cbInQue);
if(length > 0)
{
m_osRead.hEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
ReadFile(hComDev,buf,length,&length,&m_osRead);
if(WaitForSingleObject(m_osRead.hEvent,3000)==WAIT_TIMEOUT);
// Sleep(500);
sss.Format("%s",buf);
CEdit*ed=(CEdit*)pParam;
ed->SetWindowText(sss);

}
return (UINT)0;
}
现在显示读回的数据始终不对，数据不是一次被都会的，尔是几次读回的，我是想一次读回缓冲区的数据，
如果去掉WaitForSingleObject函数，用延时数据分两次被读回，第一次读回前8个字节，第二次读回剩余的字节

[htkyyz]

自己一下

[wangweintk]

设个断点，调一下。

[lzwcom]

用阻塞方式能够实现

[yyz2000]

up

[yyz2000]

up

[my_mtx]

up

[yyz2000]

up

[yyz2000]

vv