// Capture primary window to a bmp
var
  bmp: TIEBitmap;
  IO: TImageEnIO;
begin
    bmp := TIEBitmap.Create;
    IO := TImageEnIO.CreateFromBitmap( bmp );
    try
      IO.CaptureFromScreen( iecsPrimary );
      ... do something with bmp ...
    finally
      IO.Free;
      bmp.Free;
    end;
end;

var
  bmp: TIEBitmap;
  IO: TImageEnIO;
begin
  bmp := TIEBitmap.Create;
  IO := TImageEnIO.CreateFromBitmap(bmp);
  try
    IO.CaptureFromScreen(iecsSpecifiedWindowClient, -1, FAppWindowHandle);
    IO.IEBitmap := bmp;
    bmp.CopyToClipboard(False);
  finally
    IO.Free;
    bmp.Free;
  end;