MFC下对串口的操作以及定时器的调用

最近研究了一下MFC下对串口的操作，测试了一下对设备的读写。

1.打开串口

     GetDlgItem(IDC_BUTTON_OPEN)->EnableWindow(FALSE);
     m_hComm = CreateFile("COM1",
         GENERIC_READ | GENERIC_WRITE,
         ,
         NULL,
         OPEN_EXISTING,
         ,
         NULL);
     if (m_hComm == INVALID_HANDLE_VALUE)
     {
         TCHAR szBuf[];
         wsprintf(szBuf,_T("打开COM1失败,代码:%d"),GetLastError());
         return;
     }

2.设置串口通讯参数

 DCB dcb;
     memset(&dcb,,sizeof(dcb));
     if (!::GetCommState(m_hComm,&dcb))
     {
         return;
     }
     dcb.BaudRate = ;
     dcb.fParity = ;
     dcb.Parity = ;
     dcb.ByteSize = ;
     dcb.StopBits = ;
     SetCommState(m_hComm,&dcb);

     if (!::SetupComm(m_hComm,,))
     {
         return;
     }

3.设定超时

                    //设定读超时
     m_CommTimeOuts.ReadIntervalTimeout=MAXDWORD;
     m_CommTimeOuts.ReadTotalTimeoutMultiplier=;
     m_CommTimeOuts.ReadTotalTimeoutConstant=;
     //在读一次输入缓冲区的内容后读操作就立即返回，
     //而不管是否读入了要求的字符。
     //设定写超时
     m_CommTimeOuts.WriteTotalTimeoutMultiplier=;
     m_CommTimeOuts.WriteTotalTimeoutConstant=;
     ::SetCommTimeouts(m_hComm,&(m_CommTimeOuts)); //设置超时
     ::PurgeComm(m_hComm,PURGE_RXCLEAR | PURGE_TXABORT);

4.开一个线程
  m_pScanThread = AfxBeginThread(ScanThreadProc,this);

5.设置定时器

快捷键Ctrl+W在MessageMaps添加消息响应

 void CTestDAMDADlg::OnTimer(UINT nIDEvent)
 {
     // TODO: Add your message handler code here and/or call default
     //AfxMessageBox("Begin");
     switch (nIDEvent)
     {
         case TIMER_2:
             {
                 //AfxMessageBox("Begin");
                 OnButton2v();
                 WriteComm(LENID,offlen);
                 KillTimer(TIMER_2);
                 SetTimer(TIMER_4,,NULL);
                 break;
             }
         case TIMER_4:
             {
                 OnButton4v();
                 WriteComm(LENID,offlen);
                 KillTimer(TIMER_4);
                 SetTimer(TIMER_6,,NULL);
                 break;
             }
         case TIMER_6:
             {
                 OnButton6v();
                 WriteComm(LENID,offlen);
                 KillTimer(TIMER_6);
                 SetTimer(TIMER_8,,NULL);
                 break;
             }

         case TIMER_8:
             {
                 OnButton8v();
                 WriteComm(LENID,offlen);
                 KillTimer(TIMER_8);
                 SetTimer(TIMER_10,,NULL);
                 break;
             }
         case TIMER_10:
             {
                 OnButton10v();
                 WriteComm(LENID,offlen);
                 KillTimer(TIMER_10);
                 SetTimer(TIMER_2,,NULL);
                 break;
             }

         default:
             {
                 OnButton6v();
                 WriteComm(LENID,offlen);
                 KillTimer(TIMER_2);
                 SetTimer(TIMER_4,,NULL);
                 break;
             }
     }
     CDialog::OnTimer(nIDEvent);
 }

线程里开启定时器
  dlg->SetTimer(TIMER_2,,NULL);

6.调用写串口操作

 BOOL CTestDAMDADlg::WriteComm(BYTE *lpByte,DWORD dwBytes)
 {
     DWORD dwBytesWrite = ;
     COMSTAT ComStat;
     DWORD dwErrorFlags;
     BOOL bWriteStat;
     ClearCommError(m_hComm,&(dwErrorFlags),&(ComStat));
     bWriteStat = WriteFile(m_hComm,lpByte,dwBytes,
                             &dwBytesWrite,NULL);
     if (!bWriteStat)
     {
         return FALSE;
     }
     else
     {
         return TRUE;
     }
 }

读串口操作类似，这样就完成了定时对串口的读写操作，测试通过！