网上搜集资料 参考写的代码 实现控件的动态创建 完整代码如下：

 (实现界面)

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, ComCtrls;

type
  TControlClass =class of TControl ;
  TForm1 = class(TForm)
    RadioGroup1: TRadioGroup;
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

 

implementation

uses unit2;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
const
  ControlClassArry: array[0..2]of
         TControlClass= (TMonthCalendar,TMemo,TColorBox) ;
var
  i:integer;
  ControlObj:TObject ;
begin
  for i:=0 to controlcount-1 do
  if (Controls[i] is TMonthCalendar) or (controls[i] is TMemo)
     or (Controls[i] is TColorBox) then
  Controls[i].Free ;
  ControlObj:= TControlFactory.create(self,ControlClassArry[RadioGroup1.ItemIndex]);
  Label1.Caption :=ControlObj.ClassName ;
  if (ControlObj is TMemo) then TMemo(ControlObj).Lines.Add('测试成功！');
  if (ControlObj is TColorBox) then TColorBox(ControlObj).ItemIndex :=2;
end;

end.

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2009-11-04