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cellspacing="1" cellpadding="1" bgcolor="#000000"><tr bgcolor="#FFFFFF"><td width="100%" colspan="4" align="left"><table width="95%" align="center"><tr><td class="font1"><p align="center"><br><font size="3">Delphi 小技巧两则</font><br><span class="nava"><font color="#CC9933">2000-07-28· -·逸仙时空</font></span></p><p>最近在研究类及类方法时发现一些很有趣的用法，这里挑出两则最有用的与大家分享。 <br> 一、访问保护属性 <br> <br> 众所周知，delphi的对象有private、protected和public三个级别的访问控制。而delphi有一个奇怪的规则，就是在同一个unit里的对象可以互相访问对方的protected 级别属性！<br> 利用这个特性，我们可以轻松访问任意对象的protected级别属性。虽然这样不是很符合面向对象编程的封装的思想，但有时的确是非常有用的。比如在使用TDBGrid时，我们对如何获得其Row和Col非常头疼，其实在TDBGrid中，Row和Col都是protected级别的属性，我们只要在需要使用这两个属性的unit的interface里声明 <br> <br> TFakeGrid = class(TDBGrid); <br> <br> 然后就可以使用TFakeGrid(ADBGrid).Row和TFakeGrid(ADBGrid).Col 轻松访问了，这个规则对protected里的方法同样适用。 <br> <br> <br> <br> 二、类方法的使用类方法（Class methods）是一类特殊的方法，它们在声明时要以class开头 <br> <br> type <br> <br> TFigure = class <br> <br> public ... <br> <br> class procedure GetInfo(var Info: TFigureInfo); <br> <br> virtual; <br> <br> ... <br> <br> end; <br> <br> 实现时也以class开头 <br> <br> class procedure TFigure.GetInfo(var Info: TFigureInfo); <br> <br> begin <br> <br> ... <br> <br> end; <br> <br> （具体意义请自行查看帮助） <br> <br> 乍一看好象平时没有遇到过这个东东，也没有看到过谁用过这个东东，好象这个东东也没有什么大作用，其实不然…… 比如我们有时为输入密码或其他常用数据专门做一个form，但由于其代码都在form定义的unit里面，所以在使用时仅仅需要几行代码，比如</p><p> with TfrmPassword.Create(nil) <br> <br> do <br> <br> try <br> <br> ShowModal; <br> <br> finally <br> <br> Free; <br> <br>⌨️ 快捷键说明
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