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Taskbar buttons

Posted on 2004-05-02
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Last Modified: 2010-04-04
I want to list apps that have Taskbar Buttons, I know it should be unowned apps.
But...
how do I get a message when an app loads (my app is the taskbar), and how do I check if its owned?
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Question by:The_SnifF
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32 Comments
 
LVL 12

Accepted Solution

by:
Ivanov_G earned 125 total points
ID: 10970735
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    ListBox1: TListBox;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

function EnumWindowsFunc (Handle: THandle; List: TStringList) : Boolean ; stdcall;
var
  Caption: array[0..256] of Char;
begin
  if (IsWindowVisible(Handle)) and (GetParent(Handle) = 0) then
    if GetWindowText(Handle, Caption, SizeOf(Caption)-1) <> 0 then
      begin
        List.Add(Caption);
      end;
  Result :=True;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ListBox1.Items.Clear;
  EnumWindows(@EnumWindowsFunc, LParam(ListBox1.Items));
end;

end.
0
 

Author Comment

by:The_SnifF
ID: 10970820
Thats great, but I want to be informed when an app loads.
that would be terrific :)
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LVL 3

Expert Comment

by:Kunfufaresi
ID: 10970836
you could add a timer and check old list and new list at intervals.
0
 
LVL 12

Expert Comment

by:Ivanov_G
ID: 10970838

   Put timer on the form and execute this in OnTimer event
0
 
LVL 4

Expert Comment

by:ceoworks
ID: 10970849
Download Cool Tray Icon from here http://subsimple.com/delphi.asp. It's really a great component(which i personally prefer..) which supports animated icons too.

Cheers,

Oktay
0
 

Author Comment

by:The_SnifF
ID: 10970918
Hmm... knowing when an app is created is kinda important, so i won't habe to redrew it with the timer.
I'll use it, as last resort, but if I can find somthing better I'll use it :)
0
 
LVL 4

Expert Comment

by:ceoworks
ID: 10970991
Ohh i'm so sorry about my comment. Maybe i didn't read your question completely and i thought that you are asking for a component or code which you can use for to create tray icons :)))

I'm sorry again..

Cheers,

Oktay
0
 

Author Comment

by:The_SnifF
ID: 10971082
np, BTW i'm working on a small shell for windows :)
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LVL 12

Expert Comment

by:Ivanov_G
ID: 10971571

  I don't know another way to monitor the opened application except this - enumerating all windows...
0
 

Author Comment

by:The_SnifF
ID: 10971584
It helped, but I don't want to make it with a timer.
I heard smth about system wide hooks... Help would be appreciated :)
0
 

Expert Comment

by:vinifreis
ID: 10972546
I think you can do this using hooks WH_GETMESSAGE and wait for messages WM_CREATE..
I'll do an simple example and post here..;-)
0
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 10975085
If ur Working on a shell application ..

use shell Hook ...

here is the link for details

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/Windowing/Hooks.asp
0
 

Author Comment

by:The_SnifF
ID: 10978341
If using global Hook and a DLL, how do i send a message to my app?
or how I can have my app's Handle for use in the DLL?
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LVL 19

Expert Comment

by:Melih SARICA
ID: 10978426
Here is an Example
'*****************************
library khook;
uses
  Windows,classes,
  Messages;

procedure SetHook; export; forward;
procedure UnSetHook; export; forward;
procedure SetMainHandle(Handle: HWND); export; forward;

exports
 SetHook ,
 UnSetHook ,
 SetMainHandle ;
const
   mGet_message = WM_user+6666;
   mSet_Focus   = WM_user+6667;
type
 PHookRec = ^THookRec;
 THookRec = record
   MainWindow: HWND;
   HookID: HHOOK;
 end;

var
 rHookRec: PHookRec = nil;
 hMapObject: THandle = 0;

procedure SetMainHandle(Handle: HWND);
begin
 rHookRec^.MainWindow := Handle;
end;

// WndProcRet hook proc
function WNDPROCRET_HookProc(nCode: Integer; iWPARAM: INTEGER; iLPARAM: INTEGER): integer; stdcall;
begin
 result := 0;
 if (nCode >= 0) And (nCode=HC_ACTION) And ((iLPARAM and (1 shl 31)) <> 0) then begin
   SendMessage(rHookRec^.MainWindow, mGet_message, iWPARAM,iLPARAM);
 end else
   Result:=CallNextHookEx(rHookRec^.HookID, nCode, iWPARAM,iLPARAM);
end;


procedure SetHook;
begin
 rHookRec^.HookID := SetWindowsHookEx(WH_KEYBOARD, @WNDPROCRET_HookProc, hInstance, 0);
end;

procedure UnSetHook;
begin
 UnHookWindowsHookEx(rHookRec^.HookID);
end;

procedure EntryPointProc(Reason: Integer);
begin

 case reason of
   DLL_PROCESS_ATTACH:
     begin
       hMapObject := CreateFileMapping($FFFFFFFF, nil, PAGE_READWRITE, 0, SizeOf(rHookRec^), 'Keyb_Hook');
       rHookRec := MapViewOfFile(hMapObject, FILE_MAP_WRITE, 0, 0, sizeof (rHookRec^));
       sethook;
     end;

   DLL_PROCESS_DETACH:
     begin
       try
         unsethook;
         UnMapViewOfFile(rHookRec);
         CloseHandle(hMapObject);
      except
       end;
     end;

   DLL_THREAD_ATTACH:
     begin
     end;
   DLL_THREAD_DETACH:
     begin
     end;
 end;
end;

begin
 DllProc := @EntryPointProc;
 EntryPointProc(DLL_PROCESS_ATTACH);
end.

'*** End of Dll
**********************
'unit.pas
unit Unit1;

interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
const
   mGet_message = WM_user+6666;
type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
     Procedure GetHook(var msg:TMessage); message mget_message;
    { Private declarations }
  public
    { Public declarations }
  end;
                                       
var
  Form1: TForm1;                                          

  mproc : procedure;
  mlib  : Cardinal;
  capt  : pAnsiChar;
  tmps  : string;
  mhnd  : cardinal;

procedure SetMainHandle(Handle: HWND);external 'khook.dll';
procedure SetHook;external 'khook.dll';
procedure UnSetHook;external 'khook.dll';
implementation

{$R *.dfm}

{ TForm1 }

procedure TForm1.GetHook(var msg: TMessage);
 var
    added : boolean;
begin
   added :=false;
   if (mhnd=msg.LParam)then
      begin
        tmps:=tmps+chr(msg.wParamlo);
        added:=true;
      end;
   if (msg.wParamlo <> 13) then
      begin
        tmps:=tmps+chr(msg.wParamlo);
        added:=true;
      end;
   if not added then
    begin
     Memo1.Lines.add('['+string(capt)+']');
     memo1.Lines.add(tmps);
     tmps:='';
    end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  mhnd := 0;
//  SetHook;
  SetMainHandle(Handle);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  UnSetHook;
end;

end.


'End of unit1.pas



0
 

Author Comment

by:The_SnifF
ID: 10978997
GetHook never gets called
0
 

Author Comment

by:The_SnifF
ID: 10980701
Hmm, I ment it never gets the message though it is sent.
0
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LVL 19

Expert Comment

by:Melih SARICA
ID: 10981671
its a working example
 that i am using as a keylogger
0
 

Author Comment

by:The_SnifF
ID: 10987007
But the app never gets the message, I have no idea why.
0
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 10987075
btw... this gettes the key strokes
0
 
LVL 12

Expert Comment

by:Ivanov_G
ID: 10987077

  Because here SetHook is in comment

procedure TForm1.Button1Click(Sender: TObject);
begin
  mhnd := 0;
//  SetHook;
  SetMainHandle(Handle);
end;

0
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 10987121
Sethook proc is in Dll's entry..

when ever dll loaded.. sethook proc executed

And i ll copy paste the all source here.. hold on...
0
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 10987315
first
Click Hook buttom to set the window handle of the application


then  if u wanna see keystrokes.. u must hit enter....


when u press enter.. chars  u did write ll be added in to the memo
0
 
LVL 12

Expert Comment

by:Ivanov_G
ID: 10987359

   non_zero, in the code you supplied, note that SetHook is in remark

procedure TForm1.Button1Click(Sender: TObject);
begin
  mhnd := 0;
//  SetHook;
  SetMainHandle(Handle);
end;
0
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 10987390
yeah i know.. same in my application ..

But as u see

***
procedure EntryPointProc(Reason: Integer);
begin

 case reason of
   DLL_PROCESS_ATTACH:
     begin
       hMapObject := CreateFileMapping($FFFFFFFF, nil, PAGE_READWRITE, 0, SizeOf(rHookRec^), 'Keyb_Hook');
       rHookRec := MapViewOfFile(hMapObject, FILE_MAP_WRITE, 0, 0, sizeof (rHookRec^));
       sethook;  // its called here when u load dll  with the code below
     end;
.
.
.
.

// Calling code of the Sethook

begin
 DllProc := @EntryPointProc;
 EntryPointProc(DLL_PROCESS_ATTACH);  // <-- this line calls the entrpoint proc.. and execute the sethook proc rite?
end.
0
 

Author Comment

by:The_SnifF
ID: 10987932
The thing is the app never gets GetHook called!
The dll gets the hook, sends a message, but the app never gets it :x
0
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 10988035

Pls its working..

Do not tell that its not getting or something like that

copy paste the code and try pls..

other files ( unit1.dfm and testhook.dpr)
//******************  save this part as testhook.dpr
program testhook;

uses
  Forms,
  Unit1 in 'Unit1.pas' {Form1};

{$R *.res}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.
//****************

//******************  save this as unit1.dfm
object Form1: TForm1
  Left = 504
  Top = 300
  Width = 358
  Height = 424
  Caption = 'Form1'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object Memo1: TMemo
    Left = 0
    Top = 8
    Width = 337
    Height = 297
    Lines.Strings = (
      'Memo1')
    TabOrder = 0
  end
  object Button1: TButton
    Left = 32
    Top = 320
    Width = 75
    Height = 25
    Caption = 'hook'
    TabOrder = 1
    OnClick = Button1Click
  end
  object Button2: TButton
    Left = 32
    Top = 352
    Width = 75
    Height = 25
    Caption = 'Un Hook'
    TabOrder = 2
    OnClick = Button2Click
  end
end
//********************



save all code in a directory
and try it...

Press Hook on the main form ... ( dont delete //  before sethook; )

open notepad

type some chars
and press enter... u ll see ur line is in the memo field

( I ve just copy paste the code's that i send u above  and try it.. and again it works fine)


0
 

Author Comment

by:The_SnifF
ID: 10989451
But I don't want it to log keys, I wanted to know when an app is created.
And i'll get to it, but when setting a breakpoint inside GetHook, it never stops there.
ofcourse i've changed it a bit, but the hook itself is still the same.
0
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 10993278
Ok..
Here is a code for Hooking new Window Creation ..
Change the units with this one.. Works fine and it gives u the handle of the new windows

//************** Main Unit ..
unit Unit1;

interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
const
   mGet_message = WM_user+6666;
type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
     Procedure GetHook(var msg:TMessage); message mget_message;
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1: TForm1;

  mproc : procedure;
  mlib  : Cardinal;
  capt  : pAnsiChar;
  tmps  : string;
  mhnd  : cardinal;

procedure SetMainHandle(Handle: HWND);external 'khook.dll';
procedure SetHook;external 'khook.dll';
procedure UnSetHook;external 'khook.dll';
implementation

{$R *.dfm}

{ TForm1 }

procedure TForm1.GetHook(var msg: TMessage);
begin
      memo1.Lines.Add(' New Window Handle : '+inttostr(msg.WParam));
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  mhnd := 0;
  SetHook;
  SetMainHandle(Handle);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  UnSetHook;
end;
end.

// end of main unit..

// Start of khook.dll
library khook;
uses
  Windows,classes,
  Messages;

procedure SetHook; export; forward;
procedure UnSetHook; export; forward;
procedure SetMainHandle(Handle: HWND); export; forward;

exports
 SetHook ,
 UnSetHook ,
 SetMainHandle ;
const
   mGet_message = WM_user+6666;
   mSet_Focus   = WM_user+6667;
type
 PHookRec = ^THookRec;
 THookRec = record
   MainWindow: HWND;
   HookID: HHOOK;
 end;

var
 rHookRec: PHookRec = nil;
 hMapObject: THandle = 0;

procedure SetMainHandle(Handle: HWND);
begin
 rHookRec^.MainWindow := Handle;
end;

// WndProcRet hook proc
function WNDPROCRET_HookProc(nCode: Integer; iWPARAM: INTEGER; iLPARAM: INTEGER): integer; stdcall;
begin
 result := 0;
 if (nCode >= 0) And (nCode=HCBT_CREATEWND) then begin
   SendMessage(rHookRec^.MainWindow, mGet_message, iWPARAM,iLPARAM);
 end else
   Result:=CallNextHookEx(rHookRec^.HookID, nCode, iWPARAM,iLPARAM);
end;


procedure SetHook;
begin
 rHookRec^.HookID := SetWindowsHookEx(WH_CBT, @WNDPROCRET_HookProc, hInstance, 0);
end;

procedure UnSetHook;
begin
 UnHookWindowsHookEx(rHookRec^.HookID);
end;

procedure EntryPointProc(Reason: Integer);
begin

 case reason of
   DLL_PROCESS_ATTACH:
     begin
       hMapObject := CreateFileMapping($FFFFFFFF, nil, PAGE_READWRITE, 0, SizeOf(rHookRec^), 'Keyb_Hook');
       rHookRec := MapViewOfFile(hMapObject, FILE_MAP_WRITE, 0, 0, sizeof (rHookRec^));
     end;

   DLL_PROCESS_DETACH:
     begin
       try
         unsethook;
         UnMapViewOfFile(rHookRec);
         CloseHandle(hMapObject);
      except
       end;
     end;

   DLL_THREAD_ATTACH:
     begin
     end;
   DLL_THREAD_DETACH:
     begin
     end;
 end;
end;

begin
 DllProc := @EntryPointProc;
 EntryPointProc(DLL_PROCESS_ATTACH);
end.
// End of dll
0
 
LVL 12

Expert Comment

by:Ivanov_G
ID: 10993418

   If you want to monitor messages you should not use WH_KEYBOARD in SetWindowsHookEx function. You have to look at the MSDN, but I think you need to use WH_CALLWNDPROC.

  WH_CALLWNDPROC      - Installs a hook procedure that monitors messages before the system sends them to the destination window procedure. For more information, see the CallWndProc hook procedure.
0
 

Author Comment

by:The_SnifF
ID: 11008935
@non_zero, It works, and I get the message, but i get it every second, even when no app was loaded.
And it eventually get windows stuck.
Have any solution?
0
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 11012323
H&#305;mmm..
it happens because, a hint is an window also..
An edit box is an window.. everything that is created is a window..

so u ave to select the main window using the handle..

Get the parent window
if handle(HWND) of parent  window is 0 (zero) it means that it s a new window.. not a child one ..

I hope it helps

Melih SARICA

And u can get detail about CBTPROC hook from the link below

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/Windowing/Hooks/HookReference/HookFunctions/CBTProc.asp
0
 

Author Comment

by:The_SnifF
ID: 11013452
I changed the func as so:

function WNDPROCRET_HookProc(nCode: Integer; iWPARAM: INTEGER; iLPARAM: INTEGER): integer; stdcall;
begin
 Result := 0;
 if (nCode >= 0) and (nCode=HCBT_CREATEWND) then
  begin
  if (IsWindowVisible(iWPARAM)) and (GetParent(iWPARAM) = 0) then
    if GetWindowText(iWPARAM, Caption, SizeOf(Caption)-1) <> 0 then
     SendMessage(rHookRec^.MainWindow, mGet_message, iWPARAM,iLPARAM);
  end
 else
  Result:=CallNextHookEx(rHookRec^.HookID, nCode, iWPARAM,iLPARAM);
end;

And I still get "flooded" by the messages and windows freezes.
0

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