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procedure TFrm.CheckImgType(Sender: TObject);  
var   //ÉùÃ÷±äÁ¿
   MyImage:TMemoryStream;   //ÄÚ´æÁ÷¶ÔÏó
   Buffer:Word;
   i:integer;
begin
   if OpenDialog1.Execute then   //OpenDialog1ÊÇÒ»¸öÎļþ´ò¿ª¶Ô»°¿ò
   begin
     MyImage:=TMemoryStream.Create; //½¨Á¢ÄÚ´æÁ÷¶ÔÏó
     try
        MyImage.LoadfromFile(OpenDialog1.FileName); //°Ñ¸Õ¸ÕÓû§Ñ¡ÔñµÄÎļþÔØÈëµ½ÄÚ´æÁ÷ÖÐ
         MyImage.Position := 0;   //ÒÆ¶¯Ö¸Õëµ½×ͷµÄλÖÃ
        if MyImage.Size = 0 then   //Èç¹ûÎļþ´óСµÈÓÚ0£¬ÄÇô
        begin
           ShowMessage('´íÎó');
           Exit;
        end;
        MyImage.ReadBuffer(Buffer,2); //¶ÁÈ¡ÎļþµÄǰ£²¸ö×Ö½Ú£¬·Åµ½BufferÀïÃæ
        if Buffer=$4D42 then //Èç¹ûǰÁ½¸ö×Ö½ÚÊÇÒÔ4D42[µÍλµ½¸ßλ]
        begin
            ShowMessage('BMP'); //ÄÇôÕâ¸öÊÇBMP¸ñʽµÄÎļþ
        end
        else if Buffer=$D8FF then //Èç¹ûǰÁ½¸ö×Ö½ÚÊÇÒÔD8FF[µÍλµ½¸ßλ]
       begin
          ShowMessage('JPEG'); //........Ò»Ñù¡¡ÏÂÃæ²»×¢ÊÍÁË
       end
       else if Buffer=$4947 then
       begin
          ShowMess


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uses 
    Windows,  
    SysUtils,  
    Classes,  
    ShellAPI;  
function RunAndWait(FileName: string; Visibility: Integer): THandle;&nbs ......

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  Perform($000B, 0, 0); //ËøÆÁÄ»  ·ÀÖ¹ÉÁ˸
  // ×öһЩ»á·¢ÉúÑÏÖØÉÁ˸µÄÊÂÇé..
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Delphi²Ù×÷XML

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