check if object exists in room.

[FanOfHumor]

I have  some script that runs if an object exists in the room but I get a "invalid object specified" error.

Code: ags

function on_event (EventType event, int data)
{
	if(event==eEventEnterRoomBeforeFadein)
	{
		if(version==0)
		{
			Room.SetProperty("versionnumber", 0);
		}

		
		

		
	}	
}	
int remtime;
// called on every game cycle, even when the game is blocked
function repeatedly_execute_always()
{	
	if(Room.GetProperty("versionnumber")==0)
	{
		if(object[0]!=null&&object[1]!=null)
		{
			object[0].Visible=true;
			object[1].Visible=true;
		}	
		if(object[2]!=null&&object[3]!=null)
		{
			object[2].Visible=false;
			object[3].Visible=false;
		}			
		
	}	
	if(Room.GetProperty("versionnumber")==1)
	{
		if(object[0]!=null&&object[1]!=null)
		{
			object[0].Visible=false;
			object[1].Visible=false;
		}	
		if(object[2]!=null&&object[3]!=null)
		{
			object[2].Visible=true;
			object[3].Visible=true;
		}			
	}	
	
	
	
	
	
	
	
	
	
	
	
	
	
	Object* o=Object.GetAtScreenXY(mouse.x, mouse.y);
	if(o!=null&&mouse.IsButtonDown(eMouseLeft))
	{
		o.Graphic=15;
		o.Graphic=16;
		GiveScore(-1);
	}	
	
}

How can I check if an object exists in the room?

[Crimson Wizard]

Please tell, on which line exactly do you get "invalid object specified" error?

I don't know what is going on in your game, but you probably also need to test the Room.ObjectCount to know how many objects are there, before accessing object[] array; because if there are 0 objects then you should not get object[0], and so on.