[Lazarus] How to save screenshot to jpg and png format files

[Bo Berglund]

I have an application which can capture a regon of the desktop into an image.
It uses TBgraBitmap since it has a method for grabbing data from the screen.

So I can assign this to the clipboard and also save to a file:

var
  MyCapture : TBgraBitmap;
  Clip: TRect;
  ...
begin
  ...
  Clip := Bounds(Self.Left, Self.Top, Self.Width, Self.Height);
  MyCapture := TBgraBitmap.Create();
  MyCapture.TakeScreenShot(Clip);
  Clipboard.Assign(MyCapture.Bitmap);
  MyCapture.Bitmap.SaveToFile(ChangeFileExt(ParamStr(0), '.jpg'));
  MyCapture.Free;
  ...
end;

But the SaveToFile results in a file that is NOT a jpeg file at all...

How could I save it to a specific (known) format, like jpg or png?


-- 
Bo Berglund
Developer in Sweden