没用过cserialPort 自己常用这样 创建线程监听吧 贴下代码给你参考 //初始化打开IO端口 void CgameDlg::init_io_com() { //打开串口，设置串口 hCom=CreateFile( TEXT("COM1"), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL); //检测打开串口操作是否成功 //若成功则建立线程监听端口 if(hCom!=INVALID_HANDLE_VALUE) { SetupComm( hCom,1024,1024) ; //设置输入、输出缓冲区的大小 COMMTIMEOUTS CommTimeOuts ; //定义超时结构，并填写该结构 CommTimeOuts.ReadIntervalTimeout=MAXDWORD; //把间隔超时设为最大，把总超时设为0将导致ReadFile立即返回并完成操作 CommTimeOuts.ReadTotalTimeoutMultiplier=0; //读时间系数 CommTimeOuts.ReadTotalTimeoutConstant=0; //读时间常量 CommTimeOuts.WriteTotalTimeoutMultiplier=1000;//总超时=时间系数*要求读/写的字符数+时间常量 CommTimeOuts.WriteTotalTimeoutConstant=2000; //设置写超时以指定WriteComm成员函数中的 SetCommTimeouts( hCom, &CommTimeOuts ) ;//设置读写操作所允许的超时 DCB dcb ; // 定义数据控制块结构 GetCommState(hCom, &dcb ) ; //读串口原来的参数设置 dcb.BaudRate =115200; dcb.ByteSize =8; dcb.Parity = NOPARITY; dcb.StopBits = ONESTOPBIT ; dcb.fBinary = TRUE ; dcb.fParity = FALSE; SetCommState(hCom, &dcb ) ; //串口参数配置 PurgeComm( hCom, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR| PURGE_RXCLEAR ); //清干净输入、输出缓冲区 hCommWatchThread=CreateThread( NULL, //安全属性 0, //初始化线程栈的大小，缺省为与主线程大小相同 CommWatchProc, //线程的全局函数 AfxGetMainWnd()->m_hWnd, //此处传入了主框架的句柄 0, NULL ); } //若不成功则提示用户打开端口出错 else { AfxMessageBox(L"IO板连接串口被占用或不存在"); } } //监听函数 //初始化IO板子的监听 DWORD WINAPI CommWatchProc(LPVOID lpParameter) { //定义存储监听到的数据的数组 DWORD dwEvtMask=0; while(true) { SetCommMask(hCom, EV_RXCHAR|EV_TXEMPTY );//有哪些串口事件需要监视？ WaitCommEvent(hCom, &dwEvtMask,0); // 等待串口通信事件的发 Sleep(20); memset(&lpInBuffer,'\0',sizeof(lpInBuffer)); cBytes=ReadPort(hCom,lpInBuffer); if(cBytes>0) { ::PostMessage((HWND)lpParameter,WM_RECVDATA1,0,0); } } return 0; } //读取端口的函数 int ReadPort(HANDLE hCom,char buffer[1000]) { DWORD dwBytesRead=1000; BOOL bReadStatus; DWORD dwErrorFlags; COMSTAT ComStat; OVERLAPPED m_osRead; memset(&m_osRead,0,sizeof(OVERLAPPED)); m_osRead.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL); ClearCommError(hCom,&dwErrorFlags,&ComStat); if(!ComStat.cbInQue) { return 0; } dwBytesRead=min(dwBytesRead,(DWORD)ComStat.cbInQue); bReadStatus=ReadFile(hCom, buffer,dwBytesRead, &dwBytesRead,&m_osRead); if(!bReadStatus) //如果ReadFile函数返回FALSE { if(GetLastError()==ERROR_IO_PENDING) { GetOverlappedResult(hCom,&m_osRead,&dwBytesRead,TRUE); // GetOverlappedResult函数的最后一个参数设为TRUE， //函数会一直等待，直到读操作完成或由于错误而返回。 return dwBytesRead; } return 0; } return dwBytesRead; } //写串口的函数 int WritePort(HANDLE hCom,char buffer[],DWORD len) { DWORD dwBytesWritten=len; OVERLAPPED m_osWrite; BOOL bWriteStat; memset(&m_osWrite,0,sizeof(OVERLAPPED)); m_osWrite.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL); bWriteStat=WriteFile(hCom,buffer,dwBytesWritten, &dwBytesWritten,&m_osWrite); if(!bWriteStat) { if(GetLastError()==ERROR_IO_PENDING) { WaitForSingleObject(m_osWrite.hEvent,1000); return dwBytesWritten; } return 0; } return dwBytesWritten; }