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<H1>VC++动态链接库编程之DLL典型实例</H1></DIV>
<DIV id=conauthor><SPAN>2005-10-11 08:32 </SPAN><SPAN>作者： 宋宝华 </SPAN><SPAN>出处： 
天极网 </SPAN><SPAN>责任编辑：<A title=向本编辑提问 
href="http://comments.yesky.com/t/·&frac12;&Ouml;&Ucirc;/6,324/2147264.shtml" target=_blank>方舟</A> 
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<DIV class=guanggao><SPAN 
id=contentAdv></SPAN></DIV>　　<B>7.3通信控制DLL</B><BR><BR>　　我们在这里举一个串口通信类的例子。<BR><BR>　　也许您需要了解一点串口通信的背景知识，其实串口到处都看得到，譬如PC机的COM口即为串行通讯口（简称串口）。如图20，打开Windows的设备管理器，我们看到了COM口。<BR><BR>　　在Windows系统，需通过DCB(Device 
Control Block)对串口进行配置。利用Windows API 
GetCommState函数可以获取串口当前配置；利用SetCommState函数则可以设置串口通讯的参数。<BR><BR>　　串行通信通常按以下四步进行： 
<BR><BR>　　(1)打开串口；<BR><BR>　　(2)配置串口；<BR><BR>　　(3)数据传送；<BR><BR>　　(4)关闭串口。<BR><BR>
<TABLE width="90%" align=center border=0>
  <TBODY>
  <TR>
    <TD>
      <DIV align=center><IMG 
      src="VC++动态链接库编程之DLL典型实例-开发者网络-VC-天极Yesk3y.files/2b6sfwuq08kz.jpg" 
      border=0><BR>图20 
PC的串口</DIV></TD></TR></TBODY></TABLE><BR>　　由此可见，我们需要给串口控制DLL提供如下四个接口函数：<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
  <TBODY>
  <TR>
    <TD>//打开指定的串口，其参数port为端口号<BR><BR>BOOL ComOpen(int port); 
      //在这个函数里使用默认的参数设置串口<BR><BR>//将打开的串口关闭<BR><BR>void ComClose(int port); 
      <BR><BR>//将串口接收缓冲区中的数据放到buffer中<BR><BR>int GetComData(char *buf, int 
      buf_len); <BR><BR>//将指定长度的数据发送到串口<BR><BR>int SendDataToCom(LPBYTE buf,int 
      buf_Len);</TD></TR></TBODY></TABLE><BR>　　下面给出了DLL接口的主要源代码框架：<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
  <TBODY>
  <TR>
    <TD>//com.h：com类通信接口<BR><BR>class AFX_EXT_CLASS 
      com<BR>{<BR>　public:<BR>　　ComOpen(int port)<BR>　　{<BR>　　　…<BR>　　}<BR>　　int 
      SendDataToCom(LPBYTE buf,int buf_Len)<BR>　　{<BR>　　　…<BR>　　}<BR>　　int 
      GetComData(char *buf, int buf_len)<BR>　　{<BR>　　　…<BR>　　}<BR>　　void 
      ComClose()<BR>　　{<BR>　　　…<BR>　　} 
<BR>　}</TD></TR></TBODY></TABLE><BR>　　我们编写一控制台程序来演示DLL的调用：<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
  <TBODY>
  <TR>
    <TD>#include &lt;iostream&gt;<BR>#include &lt;exception&gt;<BR><BR>using 
      namespace std;<BR><BR>#include &lt;windows.h&gt;<BR>#include "com.h" 
      //包含DLL中导出类的头文件 int main(int argc, char 
      *argv[])<BR>{<BR>　try<BR>　{<BR>　　char str[] = "com_class test";<BR>　　com 
      com1; <BR>　　com1.ComOpen (1); <BR>　　for(int i=0; i&lt;100; i++) 
      //以同步方式写com的buffer<BR>　　{<BR>　　　Sleep(500);<BR>　　　com1.SendDataToCom 
      (str,strlen(str)); <BR>　　}<BR>　　com1.ComClose 
      ();<BR>　}<BR>　catch(exception &amp;e)<BR>　{<BR>　　cout &lt;&lt; e.what() 
      &lt;&lt; endl;<BR>　}<BR>　return 0; 
<BR>}</TD></TR></TBODY></TABLE><BR>　　DLL的编写与调用方法及主要应用皆已讲完，在下一节里，我们将看到比较“高深”的主题――DLL木马。曾几何时，DLL木马成为了病毒的一种十分重要的形式，是DLL的什么特性使得它能够成为一种病毒？下一节我们将揭晓谜底。<BR><BR>
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