1   
2   //---------------------------------------------------------------------------
3   
4   #include <vcl.h>
5   #pragma hdrstop
6   
7   #include "Unit1.h"
8   //---------------------------------------------------------------------------
9   #pragma package(smart_init)
10  #pragma resource "*.dfm"
11  TForm1 *Form1;
12  //---------------------------------------------------------------------------
13  __fastcall TForm1::TForm1(TComponent* Owner)
14          : TForm(Owner)
15  {
16  }
17  //---------------------------------------------------------------------------
18  bool  __fastcall TForm1::IsActiveDeskTopOn(void)
19  {
20  
21  HWND Hd ;
22  bool  bOn;
23  bOn = true;
24  
25    Hd = FindWindow("Progman", NULL);
26    Hd = FindWindowEx( Hd, 0, "SHELLDLL_DefView", NULL);
27    Hd = FindWindowEx( Hd, 0, "Internet Explorer_Server", NULL);
28    if (Hd == 0)
29      bOn = false;
30  
31  return bOn;
32  }
33  //---------------------------------------------------------------------------
34  void __fastcall TForm1::Button1Click(TObject *Sender)
35  {
36  if (IsActiveDeskTopOn()){
37     ShowMessage("Active Desktop is ON");
38   }
39  else
40   ShowMessage("Active Desktop is OFF");
41  
42  }
43  //---------------------------------------------------------------------------
44