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📁 好书啊!很好哦
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<title>获得TMemo上的可见行数                             </title>
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      <div align="center" class="btitle">获得TMemo上的可见行数                             <br>
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      <div align="center"><strong>CoDelphi.com                                      </strong></div>
       
      <b><br>
      　摘　要</b>：在我的Memo组件上多少行是可见的?                   <br>
      <b>　关键字</b>：可见行&nbspTMemo&nbspmemo                          <br>
      <b>　类　别</b>：用户界面                                           
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      <span class="content"><br>&nbsp&nbsp&nbsp&nbspfunction&nbspLinesVisible(Memo:&nbspTMemo):&nbspinteger;&nbsp<br>&nbsp&nbsp&nbsp&nbspVar&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspOldFont&nbsp:&nbspHFont;&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspHand&nbsp:&nbspTHandle;&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspTM&nbsp:&nbspTTextMetric;&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspRect&nbsp&nbsp:&nbspTRect;&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsptempint&nbsp:&nbspinteger;&nbsp<br>&nbsp&nbsp&nbsp&nbspbegin&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspHand&nbsp:=&nbspGetDC(Memo.Handle);&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsptry&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspOldFont&nbsp:=&nbspSelectObject(Hand,&nbspMemo.Font.Handle);&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsptry&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspGetTextMetrics(Hand,&nbspTM);&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspMemo.Perform(EM_GETRECT,&nbsp0,&nbsplongint(@Rect));&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsptempint&nbsp:=&nbsp(Rect.Bottom&nbsp-&nbspRect.Top)&nbspdiv&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp(TM.tmHeight&nbsp+&nbspTM.tmExternalLeading);&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspfinally&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspSelectObject(Hand,&nbspOldFont);&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspend;&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspfinally&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspReleaseDC(Memo.Handle,&nbspHand);&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspend;&nbsp<br>&nbsp&nbsp&nbsp&nbsp&nbsp&nbspResult&nbsp:=&nbsptempint;&nbsp<br>&nbsp&nbsp&nbsp&nbspend;&nbsp<br><br>&nbsp&nbsp&nbsp&nbsp在Win2000上运行的delphi&nbsp4上测试通过。在其它windows版本上的delphi上应该能正常运行。&nbsp<br>2000年4月28日最后编写完成。很高兴Paul&nbspKlerlein提出这个问题。&nbsp<br><br></span> 
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  中文开发在线<a href="http://www.codelphi.com" target="_blank">www.codelphi.com</a>授权使用。
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