C / C++ / MFC

void HookManager::Init(ListenerWindow *l) {
	l->GetListeners().push_back(this);

	TCHAR dllPath[MAX_PATH];
	GetCurrentDirectory(MAX_PATH,dllPath);
	
#ifdef XWS_64
	_tcscat_s(dllPath,MAX_PATH,_T("\\XWSHook64.dll"));
#else
	_tcscat_s(dllPath,MAX_PATH,_T("\\XWSHook.dll"));
#endif

	mHookInstance = LoadLibrary(dllPath);

	if(!mHookInstance)
		throw _T("Could not load the hook DLL.");

	//this is a little function I use to set the DLL's 
	//shared data segment
	void (*pfnSetSharedHookHandles)(HWND,HHOOK) = (void(*)(HWND,HHOOK))
		GetProcAddress(mHookInstance,"SetSharedHookHandles");

	HOOKPROC pfnShellHookProc = (HOOKPROC)
		GetProcAddress(mHookInstance,"ShellHookProc");

	if(!pfnSetHookHandles || !pfnShellHookProc) {
		FreeLibrary(mHookInstance);
		mHookInstance = NULL;
		throw _T("Could not locate the hook procedures.");
	}

	mShellHook = SetWindowsHookEx(WH_SHELL,pfnShellHookProc,mHookInstance,0);
	if(!mShellHook) {
		FreeLibrary(mHookInstance);
		mHookInstance = NULL;
		throw _T("Could not establish the system hook.");
	}

	pfnSetSharedHookHandles(l->GetHwnd(),mShellHook);
}