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var 
fs : TFileStream
begin 
   
  fs := tfilestream.Create('Test.jpg',fmCreate);
  s := TMemoryStream.Create;         
  jpg := Tjpegimage.Create;    
  
  bitmap := TakeScreenShot();        
  jpg.CompressionQuality := Quality;     
  jpg.Compress;                          
  jpg.Assign(bitmap);                         
  jpg.SaveToStream(fs);                   
                                          

    S.Write('Bild', length('Bild') );
    S.CopyFrom( fs, fs.Size );   -> EReadError - Warum? egal ob Memory oder sonstewas steram;

...
...

    bitmap.Free;
    jpg.Free;
    fs.Free;