我的程式(BCB 6)於下列, 開啟 LPT1 和寫資料到 LPT1 都沒問題, 但讀資料時, 都讀不到任何資料, 不知道哪裡出錯了... HANDLE int_PortHandle; COMMTIMEOUTS CommTimeout; //開啟 LPT1 int_PortHandle = CreateFile("LPT1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); CommTimeout.ReadIntervalTimeout = 1000; CommTimeout.ReadTotalTimeoutMultiplier = 1000; CommTimeout.ReadTotalTimeoutConstant = 1000; CommTimeout.WriteTotalTimeoutMultiplier = 1000; CommTimeout.WriteTotalTimeoutConstant = 1000; SetCommTimeouts( int_PortHandle,&CommTimeout); //寫入LPT1 DWord dwCharsWritten = 0; AnsiString sData = "ECS"; char a[1600]; int i; for(i = 1;i<=sData.Length();i ) a[i] = sData[i]; WriteFile(int_PortHandle, a, i, &dwCharsWritten, NULL); if( dwCharsWritten != i) ShowMessage("寫入長度錯誤"); //讀資料 AnsiString sBuffer; char b[1600]; DWord cbCharsAvailable = 512; //最大允許接收 char數. DWord cbCharsRead; //實際接收 char 數 ReadFile(int_PortHandle, b, cbCharsAvailable, &cbCharsRead, NULL); for(int i = 0;i < cbCharsRead; i ) sBuffer = b[i]; ShowMessage(sBuffer); CloseHandle(int_PortHandle);