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ºÜ¶à¶«Î÷ÎÒÃÇÒѾ­ÔÚÉÏÃæ˵¹ýÁË£¬ÕâÀï²»¶à˵ÁË£¬ÎÒÒªÖ±ÈëͼÐοؼþµÄÖص㡣ͼÐοؼþ²»ÊÇ·â×°WindowsµÄ¿Ø¼þ£¬¶øÊÇDelphi×Ô¼º»­³öÀ´µÄ£¬ÄÇôËü¿Ï¶¨ÓÐÒ»¸ö»­¿Ø¼þµÄº¯Êý¡£Õâ¸öº¯Êý¾ÍÊÇ:
Paint;
 ¿´Ò»ÏÂVCLÔ´Â룬¿ÉÒÔÖªµÀËü¶¨ÒåÔÚTGraphicControl¡£ÖУº
 procedure Paint; virtual;
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procedure TGraphicControl.Paint;
begin
end;
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ÄÇôÊÇË­µ÷ÓÃÁËÕâ¸öº¯ÊýÀ´ÒýÆ𻭿ؼþÄØ¡£WindowsÓÐÒ»¸öWM_PAINT;ÏûÏ¢£¬µ±Ò»ÇÐÒýÆðÖØ»­µÄÌõ¼þ·¢Éú£¬Ôò»á·¢ËÍÕâÌõÏûÏ¢£¬ÔÙ¿´¿´TGraphicControl£¬¹ûÈ»ÓнػñÕâ¸öÏûÏ¢£º
procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
ÔÚ´¦Àíº¯ÊýÀïÃ棬µ÷ÓÃÁËPaint·½·¨£¬´Ó¶øʵÏÖÁË»­Í¼Ðοؼþ¿ÉÄÜ£º
procedure TGraphicControl.WMPaint(var Message: TWMPaint);
begin
  if Message.DC <> 0 then
  begin
    Canvas.Lock;
    try
      Canvas.Handle := Message.DC;
      try
        Paint;   //µ÷ÓÃÁËÕâ¸öº¯ÊýÀ´»­Í¼Ðοؼþ
      finally
        Canvas.Handle := 0;
      end;
    finally
      Canvas.Unlock;
    end;
  end;
end;
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delphi_ÊÖ¹¤´´½¨dataset

procedure TForm1.Button3Click(Sender: TObject);
begin
    //ÏÔʾ´´½¨µÄÊý¾Ý¼¯: dbgrid->datasource->clientdataset
    //Èç¹ûÊÖ¹¤¿ØÖÆdbgridÏÔʾ¿í¶È,dbgridÓÒ¼ü´´½¨Á½¸ö×Ö¶Îaa,bb,·Ö±ðÉèÖÿí¶È¼´¿É
    cds1.FieldDefs.Add('aa',ftString,40);
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