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<DIV class=newsmallbox>Windows CE下的串口通信编程 </DIV>
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<DIV class=newsmall1box>
<DIV class=newtitle1>作者： 付林林 </DIV>
<DIV class=newtitle2>出处： 天极网 </DIV>
<DIV class=newtitle3>责任编辑： 方舟 </DIV>
<DIV class=newtitle4>[ 2004-08-23 18:45 ]</DIV></DIV>
<DIV class=clear1></DIV>
<DIV class=space2><SPAN id=ad5></SPAN></DIV><BR>
<DIV class=newmiddlebox style="OVERFLOW: hidden">
<DIV class=guanggao><SPAN 
id=ad4></SPAN></DIV>　　<STRONG>二、关闭串口</STRONG><BR><BR>　　关闭串口用关闭句柄函数。<BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#e6e4dd border=1>
  <TBODY>
  <TR>
    <TD>if(hSerial != NULL) <BR>{<BR>　CloseHandle(hSerial);<BR>　hSerial = 
      NULL;<BR>}</TD></TR></TBODY></TABLE><BR>　　<STRONG>三、向串口发送数据</STRONG><BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#e6e4dd border=1>
  <TBODY>
  <TR>
    <TD>WriteFile (hSerial, // 句柄<BR>　&amp;Byte, // 数据缓冲区地址<BR>　nByte, // 
      数据大小<BR>　&amp;dwNumBytes, // 返回发送出去的字节数<BR>　NULL // 
  不支持重叠<BR>);</TD></TR></TBODY></TABLE><BR>　　向串口发送数据一般都会成功。需要注意的是如果终端设备需要一定处理时间或者称反应时间的话，那么两个写操作之间一定要注意时间间隔不能太小。具体的时间由终端设备的反应时间和缓冲区大小有关。<BR><BR>　　<STRONG>四、读取串口数据</STRONG><BR><BR>　　串口麻烦就麻烦在读取数据上。除了考虑及时的读取数据外，还要解决接收到的数据的处理工作。如果在读取串口数据的线程中安置数据处理工作，那么可能会丢失数据（终端设备发送数据但是没收到），也有可能不会丢失（终端设备发送的数据的时间、大小都是确定的）。如果肯定接收的数据在处理工作结束后终端设备才发送数据，那么完全可以将数据处理工作放在读取串口的线程中。对于及时的读取数据，下面提供了一种解决办法：<BR><BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#e6e4dd border=1>
  <TBODY>
  <TR>
    <TD>*** 假设接收的都是字符 ***<BR><BR>UINT ReadThread(LPVOID pParam) 
      ////接收串口数据线程<BR>{ <BR>　HANDLE hPort = *(HANDLE*)pParam;<BR>　BYTE 
      Byte;<BR>　int iCounter = 0;<BR>　DWORD dwBytes;<BR>　char ReceiveBuf[1000]; 
      ///缓冲区的大小 <BR><BR>　SetCommMask (hPort, EV_RXCHAR); ///只接收字符<BR>　while 
      (hPort != INVALID_HANDLE_VALUE) <BR>　{<BR>　　DWORD 
      dwCommStatus;<BR>　　WaitCommEvent(hPort, &amp;dwCommStatus, 
      0);<BR>　　SetCommMask (hPort, EV_RXCHAR); ///重新设置要等待的信号<BR>　　//// 
      接收数据<BR>　　do <BR>　　{<BR>　　　ReadFile(hPort, &amp;Byte, 1, &amp;dwBytes, 0); 
      <BR>　　　if(dwBytes == 1)<BR>　　　{<BR>　　　　ReceiveBuf[iCounter++] = 
      Byte;<BR>　　　　if(iCounter == 
      1000)<BR>　　　　{<BR>　　　　　///L"接收缓冲区已满";<BR>　　　　　return -1;<BR>　　　　}<BR>　　　} 
      <BR>　　} while (dwBytes == 1);<BR>　　if(iCounter == 0) 
      ////没接到数据<BR>　　{<BR>　　　continue;<BR>　　}<BR>　　//////保存数据<BR>　　char* pTmp = 
      new char[iCounter + 1];<BR>　　if(pTmp == 
      NULL)<BR>　　{<BR>　　　///L"内存不足，接收串口数据线程关闭";<BR>　　　return 
      -1;<BR>　　}<BR>　　memcpy(pTmp, ReceiveBuf, iCounter);<BR>　　pTmp[iCounter] = 
      NULL; ////字符串结尾<BR>　　////////创建新线程处理数据 <BR>　　AfxBeginThread(ProcessData, 
      pTmp); ////在ProcessData函数中处理数据。别忘了delete[] pTmp;<BR>　　iCounter = 0; 
      ////清空计数器<BR>　} ///////end while<BR>　return 0;<BR>}</TD></TR></TBODY></TABLE>
<P><BR>　　在ReadThread的代码中，对接收数据后的处理采用另外一个线程来执行，这种解决方法不适合所有需要，只适合读取终端设备返回来的少量数据。软件开发者要编写串口读线程代码应该具体问题具体分析。另外如果想在任意时刻停止读串口线程，应该按如下形式调用函数：</P>
<P>SetCommMask(hPort,EV_RXCHAR|EV_TXEMPTY);</P>
<P>　　EV_TXEMPTY表示当输出字符都发送出去作为一个事件。那么我们可以发送任意一个字符，这个字符发送出去后WaitCommEvent就返回。<BR><BR>　　付林林：<BR><BR>　　2001年毕业，一直从事Windows 
CE下操作系统内核定制和应用软件开发工作,参与中国第一台Auto 
PC（车载电脑）的软件研发工作,希望和CE平台开发者交流、探讨。<BR><BR>　　联系作者请邮至：fllsoft@sina.com或windowsce@tom.com；MSN：Messenger：windowsce@tom.com<BR><BR><BR></P>
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