1   
2   unit Unit1;
3   
4   interface
5   
6   uses
7     Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
8     Dialogs, StdCtrls;
9   
10  type
11    TForm1 = class(TForm)
12      Button1: TButton;
13      procedure Button1Click(Sender: TObject);
14    private
15      { Private declarations }
16    public
17      { Public declarations }
18    end;
19  
20  var
21    Form1: TForm1;
22  
23  implementation
24  
25  {$R *.dfm}
26  
27  function GetColorsCount : Int64;
28  var
29    h : hDC;
30    bitsperpixel:Int64;
31  begin
32    Result := 0;
33    bitsperpixel := 0;
34    try
35      h      := GetDC(0);
36      bitsperpixel := GetDeviceCaps(h, PLANES) *
37                        GetDeviceCaps(h, BITSPIXEL);
38      Result := 1 shl bitsperpixel;
39    finally
40      ReleaseDC(0, h);
41    end;
42  end;
43  
44  
45  procedure TForm1.Button1Click(Sender: TObject);
46  var
47  i:integer;
48  begin
49  showmessage('Colors:'+intToStr(GetColorsCount));
50  end;
51  
52  end.