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procedure ScreenCapture(Bmp: TBitmap);
var
  DeskWnd: HWnd;
  DeskDC: HDC;
  DeskCv: TCanvas;
  R: TRect;
  W, H: Integer;
begin
  if Bmp = nil then Exit;
  DeskWnd := GetDesktopWindow;
  DeskDC := GetWindowDC(DeskWnd);
  DeskCv := TCanvas.Create;
  DeskCv.Handle := DeskDC;
  W := Screen.Width;
  H := Screen.Height;
  R := Bounds(0, 0, W, H);
  try
    Bmp.HandleType := bmDIB;
    Bmp.PixelFormat := pf24Bit;
    Bmp.Width := W;
    Bmp.Height := H;
    Bmp.Canvas.CopyMode := cmSrcCopy;
    Bmp.Canvas.CopyRect(R, DeskCv, R);
  finally
    DeskCv.Free;
    ReleaseDC(DeskWnd, DeskDC);
  end;
end;                    

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procedure GenSceenshot(var BMP: TBitmap);
  var
    DC: THandle;
  begin
    if Assigned(BMP) then
      begin
        dc := GetDC(0);
          try
            With BMP do
              begin
                Width := Screen.Width;
                Height:= Screen.Height;
                BitBlt(Canvas.Handle,
                0,
                0,
                Screen.Width,
                Screen.Height,
                dc,
                0,
                0,
                SrcCopy);
              end;
          finally
            ReleaseDC(0, DC);
        end;
      end;
end;