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Delphi

MainUnit.pas：源码内容

							unit MainUnit;
interface
uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls;
type
  TForm1 = class(TForm)
    Image1: TImage;
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1: TForm1;
implementation
uses  JpegDecode;
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
   fileName:string;
   Bf:BITMAPFILEHEADER;
   MS:TMemoryStream;
   pImg:Pointer;
begin
  if OpenDialog1.Execute then
  begin
     fileName:=OpenDialog1.FileName;
     if LoadJpegFile(FileName,pImg) then
     begin
        MS:=TMemoryStream.Create;
        CopyMemory(@bf,pImg,sizeof(BITMAPFILEHEADER));
        MS.Write(pImg^,bf.BfSize);
        MS.Position:=0;
        Image1.Picture.Bitmap.LoadFromStream(MS);
        MS.Free;
        FreeMem(pImg);
     end else
        ShowMessage('调用失败');
  end;
end;
end.

						