Global Hook Spam

DECLDIR LRESULT CALLBACK CallWndProc(int nCode, WPARAM wParam, LPARAM lParam)
   {
 
	   if(nCode == HC_ACTION){
 
		   CWPSTRUCT *msg = reinterpret_cast<CWPSTRUCT *>(lParam);
 
		   if(msg->message == WM_ACTIVATEAPP){
				
				struct appActiveEvent *notification = (struct appActiveEvent*)malloc(sizeof(appActiveEvent));
 
			   if(msg->wParam){
 
				   notification->pid = GetCurrentProcessId();
 
 
				   DWORD bufSz = sizeof(notification->appName);
				   if( GetModuleFileName(NULL, notification->appName, bufSz) >= bufSz)
					   notification->appName[wcslen(notification->appName)-1] = NULL;
				   
                                   // This gets called about 10x per focus change event
				   WriteEventToFile(notification);
			   }
			   
			   free(notification);
			   // only care about app being activated, so do nothing in the else case
		   }
	   }
 
	   return CallNextHookEx(NULL, nCode, wParam, lParam);
   }