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<p class=MsoNormal><b><span lang=EN-US style='color:blue'>Windows API</span></b><b><span
style='font-family:宋体;color:blue'>串口编程参考</span></b></p>
<p class=MsoNormal><b><span lang=EN-US> </span></b></p>
<p class=MsoNormal><b><span style='font-family:宋体'>（一）</span><span lang=EN-US>Windows
API</span></b><b><span style='font-family:宋体'>串口通信编程概述</span></b></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US>Windows</span><span
style='font-family:宋体'>环境下的串口编程与</span><span lang=EN-US>DOS</span><span
style='font-family:宋体'>环境下的串口编程有很大不同。</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>环境下的编程的最大特征之一就是设备无关性，它通过设备驱动程序将</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>应用程序同不同的外部设备隔离。</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>封装了</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>的通信机制，这种方式称为通信</span><span lang=EN-US>API</span><span
style='font-family:宋体'>，</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>程序可以利用</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>通信</span><span lang=EN-US>API</span><span
style='font-family:宋体'>进行编程，不用对硬件直接进行操作。这种体系被称为</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>开放式服务体系（</span><span lang=EN-US>WOSA,Windows Open
Services Architectures</span><span style='font-family:宋体'>）。</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体'>早期的</span><span
lang=EN-US>Windows3.x</span><span style='font-family:宋体'>与</span><span
lang=EN-US>Windows 9x/NT/2000</span><span style='font-family:宋体'>的通信</span><span
lang=EN-US>API</span><span style='font-family:宋体'>有很大不同，在</span><span
lang=EN-US>16</span><span style='font-family:宋体'>位的串行通信程序中，一般使用</span><span
lang=EN-US>16</span><span style='font-family:宋体'>位的</span><span lang=EN-US>Windows
API</span><span style='font-family:宋体'>通信函数。为使大家对串口通信有<span class=GramE>一全面</span>的理解，下面简单介绍一下</span><span
lang=EN-US>16</span><span style='font-family:宋体'>位的</span><span lang=EN-US>Windows
API</span><span style='font-family:宋体'>通信函数：</span> </p>
<p class=MsoNormal style='margin-left:57.0pt;text-indent:-.5in'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>（</span><span lang=EN-US>1</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='font-size:7.0pt'> <span class=GramE> </span>
</span><span style='font-family:宋体'>打开和关闭串口</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US>OpenComm()</span><span
style='font-family:宋体'>打开串口资源，并指定输入、输出缓冲区的大小（以字节计）；</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US>CloseComm()</span><span
style='font-family:宋体'>关闭串口；</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span style='font-family:宋体'>例：</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span class=GramE><span
lang=EN-US style='background:#D9D9D9'>int</span></span><span lang=EN-US
style='background:#D9D9D9'> idComDev;</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US
style='background:#D9D9D9'>idComdev=OpenComm(</span><span style='font-family:
宋体;background:#D9D9D9'>“</span><span lang=EN-US style='background:#D9D9D9'>COM1</span><span
style='font-family:宋体;background:#D9D9D9'>”，</span><span lang=EN-US
style='background:#D9D9D9'>1024</span><span style='font-family:宋体;background:
#D9D9D9'>，</span><span lang=EN-US style='background:#D9D9D9'>512)</span><span
style='font-family:宋体;background:#D9D9D9'>；</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span class=GramE><span
lang=EN-US style='background:#D9D9D9'>CloseComm(</span></span><span lang=EN-US
style='background:#D9D9D9'>idComDev);</span></p>
<p class=MsoNormal style='margin-left:44.25pt;text-indent:-23.25pt'><span
lang=EN-US>(2)</span><span lang=EN-US style='font-size:7.0pt'> <span
class=GramE> </span> </span><span
style='font-family:宋体'>初始化串口</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US>BuildCommDCB()</span><span
style='font-family:宋体'>、</span><span lang=EN-US>setCommState()</span><span
style='font-family:宋体'>填写设备控制块</span><span lang=EN-US>DCB</span><span
style='font-family:宋体'>，然后对已打开的串口进行参数配置，例：</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US
style='background:#D9D9D9'>DCB dcb;</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US
style='background:#D9D9D9'>BuildCommDCB(</span><span style='font-family:宋体;
background:#D9D9D9'>〝</span><span lang=EN-US style='background:#D9D9D9'>COM1:2400,n,8,1</span><span
style='font-family:宋体;background:#D9D9D9'>〞</span><span lang=EN-US
style='background:#D9D9D9'>,&dcb);</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span class=GramE><span
lang=EN-US style='background:#D9D9D9'>SetCommState(</span></span><span
lang=EN-US style='background:#D9D9D9'>&dcb);</span></p>
<p class=MsoNormal style='margin-left:44.25pt;text-indent:-23.25pt'><span
lang=EN-US>(3)</span><span lang=EN-US style='font-size:7.0pt'> <span
class=GramE> </span> </span><span
style='font-family:宋体'>对串口进行读写</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US>ReadComm</span><span
style='font-family:宋体'>、</span><span lang=EN-US>WriteComm()</span><span
style='font-family:宋体'>对串口进行读写操作，即数据的接收和发送。例：</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span class=GramE><span
lang=EN-US style='background:#D9D9D9'>char</span></span><span lang=EN-US
style='background:#D9D9D9'> *m_pReceive; int count;</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span class=GramE><span
lang=EN-US style='background:#D9D9D9'>ReadComm(</span></span><span lang=EN-US
style='background:#D9D9D9'>idComDev,m_pReceive,count);</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US
style='background:#D9D9D9'> </span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US
style='background:#D9D9D9'> </span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US
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