[A5] User Event are giving me a hard time.

[A5] User Event are giving me a hard time.

ryancoboy

Member #14,468

July 2012

So I've been messing around with A5 some more and the next thing I've decided to learn is how to properly use/define User Defined Events in Allegro. So I made a simple project just to learn the basics. And I have been experiencing nothing but problems for a few days now. So, I would be very grateful if someone could tell me why the following does not work as intended. Thanks in advanced.

Note: this is a smaller snippet of my code and hopefully I have included all the relevant code here.

Main.cpp

int main()
{
//all basic allegro stuff has been initialized at this point
  ALLEGRO_EVENT_QUEUE *event_queue = NULL;

  SubMenu_UserEvent::Instance(); //this is here to call the "SubMenu_UserEvent" ctor

  al_register_event_source(event_queue, &SubMenu_UserEvent::Instance()->Get_Source());
  SubMenu_UserEvent::Instance()->TestEvent(); //fails.
//.
//.
//.

Example.h

#SelectExpand
  1//Singleton Class to manage this event.
  2class SubMenu_UserEvent
  3{
  4private:
  5  ALLEGRO_EVENT_SOURCE  subMenu_event_source;
  6  ALLEGRO_EVENT      subMenu_event;
  7  
  8public:
  9  static SubMenu_UserEvent* Instance();
 10
 11  ALLEGRO_EVENT_SOURCE Get_Source() {return subMenu_event_source;}
 12
 13  void SetDataAndEmit(int Data) {
 14    subMenu_event.user.data1 = Data; 
 15    TestEvent();
 16  }
 17  
 18  void TestEvent();
 19
 20private:
 21  SubMenu_UserEvent();
 22  //~SubMenu_UserEvent();
 23  SubMenu_UserEvent(const SubMenu_UserEvent&);
 24  SubMenu_UserEvent& operator=(const SubMenu_UserEvent&);
 25};

Example.cpp

#SelectExpand
  1SubMenu_UserEvent::SubMenu_UserEvent()
  2{
  3  al_init_user_event_source(&subMenu_event_source);
  4  subMenu_event.user.type = ALLEGRO_GET_EVENT_TYPE('M', 'S', 'M', 'E');
  5}
  6
  7void SubMenu_UserEvent::TestEvent()
  8{
  9  if(!al_emit_user_event(&subMenu_event_source, &subMenu_event, NULL))
 10  {
 11    std::cout << "fail";
 12  }  
 13}
 14
 15SubMenu_UserEvent* SubMenu_UserEvent::Instance()
 16{
 17  static SubMenu_UserEvent temp_instance;
 18
 19  return &temp_instance;
 20}

Thanks,

-Ryan
----------------------------------------------------
If I'm asking, it's because I failed for over 2 hours trying to find the answer on Google / trying to fix it myself.

Edgar Reynaldo

Major Reynaldo

May 2007

It's because you're using the address of a temporary copy of your ALLEGRO_EVENT_SOURCE.

Try this :
ALLEGRO_EVENT_SOURCE& Get_Source() {return subMenu_event_source;}

Otherwise you're just registering a copy. Which won't work.

Specifically, this expression fails to give you the address of your event source :
&SubMenu_UserEvent::Instance()->Get_Source()

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ryancoboy

Member #14,468

July 2012

hahahaha...I can't believe I missed that. Three days of staring at this thing and I didn't catch that. I guess I just needed a fresh pair of eyes to look at it. Thanks a lot Edgar.

-Ryan
----------------------------------------------------
If I'm asking, it's because I failed for over 2 hours trying to find the answer on Google / trying to fix it myself.