TImage - TBitmap und TmemoryStream

[bernhard_LA]

unten ein kleiner Testcode zum hin und her kopieren von Bildern auf einem TImage in einen TMemoryStream.
Wenn ich in der Delphi IDE zwei *.bmp#s in das TImage lade spielt der Code, wenn ich *.jpg in das TImage lade klappt das ganze nicht mehr.

Warum, ich dachte es egal was die quelle /Image typ war ?

Delphi-Quellcode:

procedure TForm1.Button1Click(Sender: TObject);
var aMemoryStream : TmemoryStream;
    BMemoryStream : TmemoryStream;
begin

    aMemoryStream := TmemoryStream.Create;

    aMemoryStream.Seek(0, soFromBeginning);

    image1.Picture.Graphic.SaveToStream(aMemoryStream);



    bMemoryStream := TmemoryStream.Create;

    bMemoryStream.Seek(0, soFromBeginning);

    image2.Picture.Graphic.SaveToStream(bMemoryStream);


    aMemoryStream.Position := 0;

    bMemoryStream.Position := 0;


    image2.Picture.Graphic.LoadFromStream(aMemoryStream);

    image1.Picture.Graphic.LoadFromStream(bMemoryStream);


    aMemoryStream.Free;


    bMemoryStream.Free;

end;

procedure TForm1.Button2Click(Sender: TObject);
var aMemoryStream : TmemoryStream;
    BMemoryStream : TmemoryStream;
begin

    aMemoryStream := TmemoryStream.Create;

    aMemoryStream.Seek(0, soFromBeginning);

    image1.Picture.Bitmap.SaveToStream(aMemoryStream);



    bMemoryStream := TmemoryStream.Create;

    bMemoryStream.Seek(0, soFromBeginning);

    image2.Picture.bitmap.SaveToStream(bMemoryStream);


    aMemoryStream.Position := 0;

    bMemoryStream.Position := 0;


    image2.Picture.bitmap.LoadFromStream(aMemoryStream);

    image1.Picture.bitmap.LoadFromStream(bMemoryStream);


    aMemoryStream.Free;


    bMemoryStream.Free;

end;