Problems with global hook! HELP!

This is a discussion on Problems with global hook! HELP! within the Windows Programming forums, part of the Platform Specific Boards category; Hi 2 all! I have a problem with hooks! I wrote a function in my dll, wich i call from ...

  1. #1
    LMZ
    LMZ is offline
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    Problems with global hook! HELP!

    Hi 2 all!
    I have a problem with hooks! I wrote a function in my dll, wich i call from the main program. Here is the text of my dll and the main code:

    dll:
    Code:
    #include <windows.h>
    
    
    __declspec(dllexport)LRESULT CALLBACK HookProcedure(int code, WPARAM wParam, LPARAM lParam)
    {	
    	HHOOK hHook;
    	if(code<0) return CallNextHookEx(hHook, code, wParam, lParam );
    	MessageBox(NULL, "HOOK!", "hook", 0);
    	return CallNextHookEx(hHook, code, wParam, lParam );
    }
    main prog:
    Code:
    #include <windows.h>
    
    #pragma comment(lib, "myhookdll")
    __declspec(dllimport)LRESULT CALLBACK HookProcedure(int ,WPARAM, LPARAM); 
    
    ......
    
    		case WM_CREATE:
    
    			hHook = SetWindowsHookEx( WH_KEYBOARD, (HOOKPROC)HookProcedure, GetModuleHandle(NULL), 0 );
    			if( hHook == NULL )
    			{
    				wsprintf(c, "%d", GetLastError());
    				MessageBox(hwnd, c, "Can't set hooK", 0);
    			}
    When my program starts, it receives mesages from keyboard and show message box. But after i minimize my program the hook doesn't work. It seems like i set an a local hook, without using dll.
    Help, plz. What is the problem?!
    im from LMoldovaZ

  2. #2
    carry on JaWiB's Avatar
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    You need to call SetWindowsHookEx/UnhoookWindowsHookEx inside the DLL
    "Think not but that I know these things; or think
    I know them not: not therefore am I short
    Of knowing what I ought."
    -John Milton, Paradise Regained (1671)

    "Work hard and it might happen."
    -XSquared

  3. #3
    LMZ
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    it stil doesn't work. i add to my dll two functions which set and unset the hooks. i call it from the main program (this functions are imported from dll). the problem doesn't disappear!
    im from LMoldovaZ

  4. #4
    Yes, my avatar is stolen anonytmouse's Avatar
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    GetModuleHandle(NULL) always returns the module handle to the exe, rather than a dll. You need to use the hInstance provided by DllMain (you can save it in a global variable, and use it in your set function) or the hInstance provided by LoadLibrary if you use it (which your current code does not).

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