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 AppFrozen(H: HWND) : Boolean;
28  var
29    dwResult: DWord;
30  const
31    timeout = 3000; // ms
32  begin
33    AppFrozen := SendMessageTimeout(H, WM_NULL, 0, 0,
34                                    SMTO_ABORTIFHUNG or SMTO_BLOCK,
35                                    timeout, dwResult) <> 0
36  end;
37  
38  
39  
40  procedure TForm1.Button1Click(Sender: TObject);
41  var
42    H: HWND;
43  
44  begin
45  
46    H := FindWindow(nil, 'Name of Application');
47    if H<>0 then
48      if AppFrozen(H) then
49        ShowMessage('This Application is Frozen!');
50  
51  
52  end;
53  
54  end.
55