windows C++ 串口通信基本代码

HANDLE hCom = CreateFile(L"\.COM4",GENERIC_READ | GENERIC_WRITE,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
	if (hCom == INVALID_HANDLE_VALUE){
		DWORD dwErr = GetLastError();
		char cData[2048] = {0};
		sprintf(cData,"打开串口失败:%d",dwErr);
		OutPut(NORMAL_LOG,cData);
		return false;
	}

	//设置读超时
	COMMTIMEOUTS timeouts;
	GetCommTimeouts(hCom,&timeouts);
	timeouts.ReadIntervalTimeout = 0;
	timeouts.ReadTotalTimeoutMultiplier = 0;
	timeouts.ReadTotalTimeoutConstant = 60000;
	timeouts.WriteTotalTimeoutMultiplier = 0;
	timeouts.WriteTotalTimeoutConstant = 0;
	SetCommTimeouts(hCom,&timeouts);

	//设置读写缓冲区大小
	static const int g_nZhenMax = 32768;
	if (!SetupComm(hCom,g_nZhenMax,g_nZhenMax)){
		DWORD dwErr = GetLastError();
		char cData[2048] = { 0 };
		sprintf(cData,"设置读写缓冲区大小失败:%d",cData);
		CloseHandle(hCom);
		return false;
	}

	//设置串口配置信息
	DCB dcb;
	if (!GetCommState(hCom,&dcb)){
		DWORD dwErr = GetLastError();
		char cData[2048] = { 0 };
		sprintf(cData,"设置串口配置信息失败:%d",cData);
		CloseHandle(hCom);
		return false;
	}

	dcb.DCBlength = sizeof(DCB);
	dcb.BaudRate = 9600;//波特率为9600    
	dcb.Parity = 0;//校验方式为无校验
	dcb.ByteSize = 8;//数据位为8位
	dcb.StopBits = ONESTOPBIT;//停止位为1位
	if (!SetCommState(hCom,cData);
		CloseHandle(hCom);
		return false;
	}

	//清空缓冲
	PurgeComm(hCom,PURGE_RXCLEAR | PURGE_TXCLEAR);

	//清除错误
	DWORD dwError;
	COMSTAT cs;
	if (!ClearCommError(hCom,&dwError,&cs)){
		CloseHandle(hCom);
		return false;
	}

	//设置串口监听事件
	SetCommMask(hCom,EV_RXCHAR);

	DWORD dwWrite = 0;
	unsigned char btCMD_OpenDoor[4] = { 0xa0,0x01,0xa2 };
	unsigned char btCMD_CloseDoor[4] = { 0xa0,0x00,0xa1 };
	while (true){
		if (WaitForSingleObject(pMain->m_hCLOSE_ALL_THREAD,10) == WAIT_OBJECT_0){
			break;
		}
		
		WriteFile(hCom,btCMD_OpenDoor,4,&dwWrite,NULL);
		Sleep(1000);
		WriteFile(hCom,btCMD_CloseDoor,NULL);
	}
	WriteFile(hCom,NULL);
	CloseHandle(hCom);