1.開啟串列埠

 1     GetDlgItem(IDC_BUTTON_OPEN)->EnableWindow(FALSE);
 2     m_hComm = CreateFile("COM1",
 3         GENERIC_READ | GENERIC_WRITE,
 4         0,
 5         NULL,
 6         OPEN_EXISTING,
 7         0,
 8         NULL);
 9     if (m_hComm == INVALID_HANDLE_VALUE)
10     {
11         TCHAR szBuf[1024
 
];
12         wsprintf(szBuf,_T("開啟COM1失敗,程式碼:%d"),GetLastError());
13         return;
14     }

2.設定串列埠通訊引數

 1 DCB dcb;
 2     memset(&dcb,0,sizeof(dcb));
 3     if (!::GetCommState(m_hComm,&dcb))
 4     {
 5         return;
 6     }
 7     dcb.BaudRate = 9600;
 8     dcb.fParity = 1;
 9     dcb.Parity = 0
 
;
10     dcb.ByteSize = 8;
11     dcb.StopBits = 0;
12     SetCommState(m_hComm,&dcb);
13 
14     if (!::SetupComm(m_hComm,1024,1024))
15     {
16         return;
17     }

3.設定超時

 1                    //設定讀超時 
 2     m_CommTimeOuts.ReadIntervalTimeout=MAXDWORD; 
 3     m_CommTimeOuts.ReadTotalTimeoutMultiplier=0
 
; 
 4     m_CommTimeOuts.ReadTotalTimeoutConstant=0; 
 5     //在讀一次輸入緩衝區的內容後讀操作就立即返回， 
 6     //而不管是否讀入了要求的字元。 
 7     //設定寫超時 
 8     m_CommTimeOuts.WriteTotalTimeoutMultiplier=100; 
 9     m_CommTimeOuts.WriteTotalTimeoutConstant=500; 
10     ::SetCommTimeouts(m_hComm,&(m_CommTimeOuts)); //設定超時
11     ::PurgeComm(m_hComm,PURGE_RXCLEAR | PURGE_TXABORT);

4.開一個執行緒
 1 m_pScanThread = AfxBeginThread(ScanThreadProc,this); 

5.設定定時器

快捷鍵Ctrl+W在MessageMaps新增訊息響應

 1 void CTestDAMDADlg::OnTimer(UINT nIDEvent) 
 2 {
 3     // TODO: Add your message handler code here and/or call default
 4     //AfxMessageBox("Begin");
 5     switch (nIDEvent)
 6     {
 7         case TIMER_2:
 8             {
 9                 //AfxMessageBox("Begin");
10                 OnButton2v();
11                 WriteComm(LENID,offlen);
12                 KillTimer(TIMER_2);
13                 SetTimer(TIMER_4,5000,NULL);
14                 break;
15             }    
16         case TIMER_4:
17             {
18                 OnButton4v();
19                 WriteComm(LENID,offlen);
20                 KillTimer(TIMER_4);
21                 SetTimer(TIMER_6,5000,NULL);
22                 break;
23             }    
24         case TIMER_6:
25             {
26                 OnButton6v();
27                 WriteComm(LENID,offlen);
28                 KillTimer(TIMER_6);
29                 SetTimer(TIMER_8,5000,NULL);
30                 break;
31             }
32             
33         case TIMER_8:
34             {
35                 OnButton8v();
36                 WriteComm(LENID,offlen);
37                 KillTimer(TIMER_8);
38                 SetTimer(TIMER_10,5000,NULL);
39                 break;
40             }    
41         case TIMER_10:
42             {
43                 OnButton10v();
44                 WriteComm(LENID,offlen);
45                 KillTimer(TIMER_10);
46                 SetTimer(TIMER_2,5000,NULL);
47                 break;
48             }
49         
50         default:
51             {
52                 OnButton6v();
53                 WriteComm(LENID,offlen);
54                 KillTimer(TIMER_2);
55                 SetTimer(TIMER_4,5000,NULL);
56                 break;    
57             }                
58     }
59     CDialog::OnTimer(nIDEvent);
60 }

執行緒裡開啟定時器
 1 dlg->SetTimer(TIMER_2,5000,NULL); 

6.呼叫寫串列埠操作

 1 BOOL CTestDAMDADlg::WriteComm(BYTE *lpByte,DWORD dwBytes)
 2 {
 3     DWORD dwBytesWrite = 20;
 4     COMSTAT ComStat;
 5     DWORD dwErrorFlags;
 6     BOOL bWriteStat;
 7     ClearCommError(m_hComm,&(dwErrorFlags),&(ComStat));
 8     bWriteStat = WriteFile(m_hComm,lpByte,dwBytes,
 9                             &dwBytesWrite,NULL);
10     if (!bWriteStat)
11     {
12         return FALSE;
13     }
14     else
15     {
16         return TRUE;
17     }
18 }

讀串列埠操作類似，這樣就完成了定時對串列埠的讀寫操作，測試通過！