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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>
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<DIV class=newmiddlebox style="OVERFLOW: hidden">
<DIV class=guanggao><SPAN id=ad4></SPAN></DIV>
<DIV class=guanggao><SPAN id=contentAdv></SPAN></DIV>　　<FONT 
color=#ff0000>作者声明：未经本文作者同意，不准擅自转载</FONT><BR><BR>　　现在大多数的笔记本电脑都没有<A 
class=bluekey href="http://www.yesky.com/key/846/55846.html" 
target=_blank>外置</A>串口，这不奇怪，因为有更快更稳定的接口代替了串口。不过基于Windows 
CE的设备仍然保留着串口，而且目前看来串口的地位暂时不会动摇。目前流行的基于CE的设备很多都具有像导航、打电话等功能，而GPS、GSM/<A 
class=bluekey href="http://www.yesky.com/key/2954/37954.html" 
target=_blank>GPRS</A>模块都是外置串口的终端设备，你想不用串口都不行。 
<BR><BR>　　上面我说了我有着自己的观点，我的观点就是不要把串口通<A class=bluekey 
href="http://www.yesky.com/key/4875/49875.html" 
target=_blank>信封</A>装成类。我不明白为什么有些人总要把串口封装成类呢。把一个事物封装成类，那这个事物就一定是不易改变的，如果每次编写都要修改，那封装成类就一点意义都没有了。设想如果MFC类总要改变的话，那我们用MFC编的程序也要修改同样次数了。如果编写超级终端一类的程序倒是可以将串口封装成类，因为超级终端只管输入命令和显示输出数据，不对输出数据进行处理，那读串口的函数就可以一直使用而不必更改。但事实上串口通信大多数用来与终端设备进行通信，需要对终端设备返回的数据进行处理。而返回的数据在什么时间返回、数据量的大小不是确定的，非要封装成类难度很大。<BR><BR>　　正如CE的帮助<A 
class=bluekey href="http://www.yesky.com/key/3869/53869.html" 
target=_blank>文档</A>所说，串口通信是最简单的通信之一。稍麻烦的是在读数据方面。<BR><BR>　　<STRONG>一、打开串口</STRONG><BR><BR>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#e6e4dd border=1>
  <TBODY>
  <TR>
    <TD>hSerial = CreateFile(L"COM1:", GENERIC_READ | GENERIC_WRITE, 0, NULL, 
      <A class=bluekey href="http://www.yesky.com/key/1093/36093.html" 
      target=_blank>OPEN</A>_EXISTING, 0, NULL);<BR>if(m_hSerial == 
      NULL)<BR>{<BR>　///L"串口打开失败";<BR>　return;<BR>}<BR><BR>///配置串口<BR><BR>DCB 
      PortDCB; <BR>PortDCB.DCBlength = sizeof(DCB); <BR>// 
      默认串口参数<BR>GetCommState(hSerial, &amp;PortDCB);<BR>PortDCB.BaudRate = 
      115200; // baud<BR>PortDCB.ByteSize = 8; // Number of bits/byte, 4-8 
      <BR>PortDCB.Parity = NOPARITY; <BR>PortDCB.StopBits = ONESTOPBIT; <BR>if 
      (! SetCommState(hSerial, 
      &amp;PortDCB))<BR>{<BR>　///L"配置串口失败";<BR>　return;<BR>}<BR><BR>////配置超时值<BR><BR>COMMTIMEOUTS 
      CommTimeouts;<BR><BR>GetCommTimeouts(m_hSerial, 
      &amp;CommTimeouts);<BR>CommTimeouts.ReadIntervalTimeout = MAXDWORD; 
      <BR>CommTimeouts.ReadTotalTimeoutMultiplier = 10; 
      <BR>CommTimeouts.ReadTotalTimeoutConstant = 10; 
      <BR>CommTimeouts.WriteTotalTimeoutMultiplier = 50; 
      <BR>CommTimeouts.WriteTotalTimeoutConstant = 100; <BR>if 
      (!SetCommTimeouts(hSerial, 
      &amp;CommTimeouts))<BR>{<BR>　///L"不能设置超时参数";<BR>　return;<BR>}</TD></TR></TBODY></TABLE><BR>　　CE的串口驱动不支持重叠，这个大家都知道的。这样的话收和发就要分开。要接收串口数据就必须创建一个线程专门用于接收数据。串口的配置不需要设置很多参数，默认的配置大部分是不需要修改的。一般改动就是波特率、位数、奇偶校检等几项。超时值是需要改动的。ReadIntervalTimeout是指两个字符传送之间的超时时间。一次写操作的超时时间等于WriteTotalTimeoutMultiplier 
乘以 要发送的字符数 加上WriteTotalTimeoutConstant。 
单位是毫秒。读操作的超时和写类似。所以设置超时是一个关键。设置太小可能丢失数据。<BR><BR>
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