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<TITLE>BCB中派生VCL类及动态地创建控件</TITLE>



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          BCB中派生VCL类及动态地创建控件</b></font>

        <p>以生成一个TMemo的派生类及动态地创建该VCL控件为例。&nbsp;<br>

          Class&nbsp;TMemoEx&nbsp;:&nbsp;public&nbsp;TMemo&nbsp;<br>

          {&nbsp;<br>

          &nbsp;.&nbsp;<br>

          &nbsp;.&nbsp;<br>

          }&nbsp;<br>

          extern&nbsp;TMemoEx&nbsp;memoex;&nbsp;<br>

          &nbsp;<br>

          Class&nbsp;TForm1&nbsp;:&nbsp;Class&nbsp;TForm&nbsp;<br>

          {&nbsp;<br>

          public:&nbsp;<br>

          &nbsp;TMemoEx&nbsp;&nbsp;&nbsp;*MemoEx;&nbsp; &nbsp;.&nbsp;<br>

          &nbsp;.&nbsp;<br>

          }&nbsp;<br>

          &nbsp;<br>

          void&nbsp;_fastcall&nbsp;&nbsp;TForm1::FormShow(TObject&nbsp;*Sender)&nbsp;<br>

          {&nbsp;<br>

          &nbsp;MemoEx=new&nbsp;TMemoEx(this);&nbsp;<br>

          &nbsp;MemoEx-&gt;Parent=this;&nbsp;<br>

          &nbsp;.&nbsp;<br>

          &nbsp;.&nbsp;<br>

          }&nbsp;<br>

          总之，遵循以下步骤即可：&nbsp;<br>

          &nbsp;类定义;&nbsp;<br>

          &nbsp;extern&nbsp;TMemoEx&nbsp;memoex;&nbsp;<br>

          &nbsp;TMemoEx&nbsp;&nbsp;&nbsp;*MemoEx;&nbsp;<br>

          &nbsp;MemoEx=new&nbsp;TMemoEx(this);&nbsp;<br>

          &nbsp;MemoEx-&gt;Parent=this;&nbsp; 

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