Solved

Systemwide Mousehook

Posted on 1997-10-12
1
404 Views
Last Modified: 2010-04-03
Hi!

I tried to install a systemwide mousehook with
SetWindowsHookEx(WH_MOUSE, MouseHookCallBack, HInstance, 0)
inside a DLL. According to any articles I read about hooking this usually installs a systemwide mousehook, but it does not!

I use the DLL from my application, both coded with Delphi3. Inside the DLL all mouseevents are filtered and if there is the right one, a WM_USER message is posted to my application to inform it of the event.
But this only recognizes mouseevents on the application's form and not on the desktop or somewhere else.

What's wrong?
Is there any other way than using a DLL and hook procedures?

I tried to subclass the desktop window, but it does not work (as I read later). I think I declared everything as it should be (export and stdcall).

I saw several applications that are obviously able to receive systemwide events, but I did not manage.

Thanks in advance,
Harro
0
Comment
Question by:tier
1 Comment
 
LVL 1

Accepted Solution

by:
olmy earned 100 total points
ID: 1347326
Hi Tier

This keyboard hook is systemwide. It calls another program, but that part you can change.

library hookdll;
uses
  SysUtils,
  Classes,
  Windows,
  Messages;
var
  MyHook: HHOOK;

function MyHookProc(code: Integer; wparam: WPARAM; lparam: LPARAM): LRESULT stdcall;
var
  h: HWND;
begin
  Result := CallNextHookEx(MyHook, code, wparam, lparam);
  if (code = HC_ACTION) and ((lparam and $80000000) = 0) then begin
    // this is a keypress - tell caller
    h := FindWindow(nil, 'HookCaller');
    if h <> 0 then
      PostMessage(h, WM_APP, 0, 0);
  end;
end;

procedure Hook;
begin
  MyHook:= SetWindowsHookEx(WH_KEYBOARD, MyHookProc, hInstance, 0);
end;

procedure UnHook;
begin
  UnhookWindowsHookEx(MyHook);
end;

exports
  Hook, UnHook;

begin
end.


I Hope this helps :)

0

Featured Post

Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
This tutorial gives a high-level tour of the interface of Marketo (a marketing automation tool to help businesses track and engage prospective customers and drive them to purchase). You will see the main areas including Marketing Activities, Design …

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question