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<title>只运行程序的一个实例                              </title>
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      <td width="621"><a href="http://www.CoDelphi.com"><img src="images/logo.gif" border="0" width="153" height="60"><img src="images/bigbanner.gif" border="0" width="468" height="60"></a></td>
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      <div align="center" class="btitle">只运行程序的一个实例                              <br>
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      <div align="center"><strong>CoDelphi.com                                      </strong></div>
       
      <b><br>
      　摘　要</b>：我如何使程序只运行一个实例？                      <br>
      <b>　关键字</b>：实例                                               <br>
      <b>　类　别</b>：用户界面                                           
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      <span class="content">&nbsp&nbsp&nbsp&nbsp在你的程序单元中加入以下代码:&nbsp<br><br>..&nbsp<br>var&nbsp<br>mutex&nbsp&nbsp&nbsp&nbsp&nbsp:&nbspTHandle;&nbsp<br>mutexName&nbsp:&nbsparray&nbsp[0..7]&nbspof&nbspchar;&nbsp<br><br>begin&nbsp<br>&nbsp&nbsptry&nbsp<br>&nbsp&nbspStrPCopy(mutexName&nbsp,''anyname'');&nbsp<br>&nbsp&nbspmutex&nbsp:=&nbspopenmutex&nbsp(&nbspMUTEX_ALL_ACCESS,&nbspFalse,&nbspmutexName&nbsp)&nbsp&nbsp;&nbsp<br><br>&nbsp&nbspIf&nbspmutex&nbsp=&nbsp0&nbspthen&nbspbegin&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspmutex&nbsp:=&nbspcreatemutex&nbsp(&nbspnil&nbsp,&nbsptrue,&nbspmutexName);&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspApplication.Initialize;&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspApplication.CreateForm&nbsp(&nbspTForm1,&nbspForm1&nbsp);&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspApplication.Run;&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspReleaseMutex&nbsp(mutex);&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspend&nbsp<br><br>&nbsp&nbspelse&nbspbegin&nbsp<br>&nbsp&nbsp&nbsp&nbspMessagedlg(&nbsp''The&nbspapplication&nbspis&nbspalready&nbsprunning.''&nbsp,&nbspmtinformation,&nbsp[mbOk],0&nbsp);&nbsp<br>&nbsp&nbsp&nbsp&nbspApplication.Terminate;&nbsp<br>&nbsp&nbspend;&nbsp<br><br>&nbsp&nbspfinally&nbsp<br>&nbsp&nbsp&nbsp...&nbsp<br><br>&nbsp&nbspend;&nbsp<br><br>end.&nbsp<br><br>&nbsp&nbsp&nbsp&nbsp如果想了解更多关于"mutex"的信息，请参看windows&nbspSDK帮助。<br></span> 
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