안녕하세요. 고수님들의 충고 부탁드립니다.
아래 소스와 같이 시리얼 통신 프로그램을 작성하여
DSP와 통신하는 프로그램입니다.그런데
win98에서는 아주 잘되었는데요, 문제는 win2000에서
해보니 프로그램에서 전송은 잘되는데 프로그램으로 받지를 못하고 있습니다.
ReadFile 부분이 문제인가요?


//-------------------------------- main.cpp

hComm = CreateFile(COMPort.c_str(),
                      GENERIC_READ | GENERIC_WRITE,
                      0,
                      NULL,
                      OPEN_EXISTING,
                      FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
                      NULL );

    // IF THE PORT CANNOT BE OPENED, BAIL OUT.

    if(hComm == INVALID_HANDLE_VALUE)
    {
       ShowMessage("COM Port Open Error, Exit!");
       Application->Terminate();
    }
    else
    {
       ComOpenSuccess=10;
       COMmLED->Color=lcGreen;
       Com_Ok_Message=COMPort+" Port successfully Opened...";
       MainForm->StatusBarMain->Panels->Items[0]->Text=Com_Ok_Message;
    }

   // SET THE COMM TIMEOUTS IN OUR EXAMPLE.

    GetCommTimeouts(hComm,&ctmoOld);
    /*ctmoNew.ReadTotalTimeoutConstant = 100;
    ctmoNew.ReadTotalTimeoutMultiplier = 0;
    ctmoNew.WriteTotalTimeoutMultiplier = 0;
    ctmoNew.WriteTotalTimeoutConstant = 0;*/
    ctmoNew.ReadIntervalTimeout = MAXDWORD;
    ctmoNew.ReadTotalTimeoutConstant = MAXDWORD;
    ctmoNew.ReadTotalTimeoutMultiplier = MAXDWORD;
    ctmoNew.WriteTotalTimeoutMultiplier = MAXDWORD;
    ctmoNew.WriteTotalTimeoutConstant = MAXDWORD;
    SetCommTimeouts(hComm, &ctmoNew);

    // SET BAUD RATE, PARITY, WORD SIZE, AND STOP BITS.
    // THERE ARE OTHER WAYS OF DOING SETTING THESE BUT THIS IS THE EASIEST.
    // IF YOU WANT TO LATER ADD CODE FOR OTHER BAUD RATES, REMEMBER
    // THAT THE ARGUMENT FOR BuildCommDCB MUST BE A POINTER TO A STRING.
    // ALSO NOTE THAT BuildCommDCB() DEFAULTS TO NO HANDSHAKING.

    dcbCommPort.DCBlength = sizeof(DCB);
    GetCommState(hComm, &dcbCommPort);
    AnsiString BuildComDCBSTRING=IntToStr(COMBps)+","+COMParity+","
                              +IntToStr(COMBit)+","+IntToStr(COMSTOPBit);
           ; // "9600,N,8,1"
    BuildCommDCB(BuildComDCBSTRING.c_str(), &dcbCommPort);
    SetCommState(hComm, &dcbCommPort);

    // ACTIVATE THE THREAD. THE FALSE ARGUMENT SIMPLY MEANS IT HITS THE
    // GROUND RUNNING RATHER THAN SUSPENDED.
    ReadThread = new TRead(false);


//(2)-------------------------------- readthread.cpp의 thread에서

while(!Terminated)
  {
    
         // 데이터를 쓰는 경우의 조건식은 생략합니다
         TransmitCommChar(hComm,'K');

         // 데이터를 읽는 경우의 조건식은 생략합니다
          ReadFile(hComm, InBuff, 1, &dwBytesRead, NULL);
          if(dwBytesRead)
          {
            InBuff[dwBytesRead] = 0; // NULL TERMINATE THE STRING
            Synchronize(DisplayIt);
          }
}