When I try to remove that listener after the object was removed I get an error
“attempt to call method ‘removeSelf’ (a nil value)”
How do I remove the listener? Just to note I am using the director class.
I am getting the same error:
attempt to call method ‘removeSelf’ (a nil value)
in the following function on the line that is removing the item “chesttop”. I can’t figure out why because it works just as I intend in the simulator.
local closechest = function()
chesttop:removeSelf() --error on this line
basketball:removeSelf()
audio.play( chestSound )
physics.pause()
if type(SQL:loadVar("highestfinished")) \>= levelNum then
SQL:saveVar( "highestfinished", 1 )
end
end
Hopefully someone can shed some light on this for me? I appreciate everyone’s help as always.
[import]uid: 31262 topic_id: 8366 reply_id: 308366[/import]
Sorry I mis-typed my code above and I forgot to mention, I am removing the ball object within the same listener I am trying to remove later.
local function removeMe ( event )
if event.phase == "ended" then
ball:removeSelf()
end
end
If I remove the listener first, the ball will never get removed. @Jmp
I am removing the listeners within a function that is called, these functions are called within the “began” phase. Is this incorrect?
I appreciate your help guys, always helpful as always not only to me but to everyone. [import]uid: 31262 topic_id: 8366 reply_id: 29983[/import]
are there any other collisions/transitions that would also remove it?
also if you’re removing the ball touched, why not use [lua]event.target:removeSelf()[/lua] rather than specificially referencing the ball object [import]uid: 6645 topic_id: 8366 reply_id: 30148[/import]
There is nothing else that would remove it. This function is only called once during the entire level (when you finish it). I didn’t use event.target because, well honestly I didn’t know you could do that. Still learning I’ll give it a try and see if it makes a difference. [import]uid: 31262 topic_id: 8366 reply_id: 30150[/import]
try [lua]print(ball)[/lua] in your removeMe function. is it nil? try [lua]print(event.target)[/lua]. is that nil? have you structured your code in a way that “ball” can actually be seen by the function? [import]uid: 6645 topic_id: 8366 reply_id: 30156[/import]
I think I know why I’m getting the error in the removeMe function. I just ordered the listeners wrong. Now I’m back to the other issue that has got me stumped.
local closechest = function()
print("chesttop")
print(chesttop)
chesttop:removeSelf() --Error on this line
audio.play( chestSound )
physics.pause()
if (SQL:loadVar("highestfinished")) \>= tostring(levelNum) then
SQL:saveVar( "highestfinished", 1 )
end
end
In this code, chesttop is never called until this function. chesttop contains an image which has already been delcared. I get the following error:
chesttop
table: 0x6d9340
chesttop
table: 0x6d9340
Runtime error
/Users/aaron/Documents/Game Project/level1.lua:60: attempt to call method ‘removeSelf’ (a nil value)
stack traceback:
[C]: in function ‘removeSelf’
/Users/aaron/Documents/Game Project/level1.lua:60: in function ‘_listener’
?: in function <?:441>
?: in function <?:214>
chesttop
table: 0x6d9340
Runtime error
/Users/aaron/Documents/Game Project/level1.lua:60: attempt to call method ‘removeSelf’ (a nil value)
stack traceback:
[C]: in function ‘removeSelf’
/Users/aaron/Documents/Game Project/level1.lua:60: in function ‘_listener’
?: in function <?:441>
?: in function <?:214>
The closechest function is called within the following listener:
local function onLocalCollision( self, event )
if ( event.phase == "began" ) then
timer.performWithDelay( 700, closechest, 1 )
timer.performWithDelay( 1400, endlevel, 1 )
end
end
Any ideas? Appreciated as always. [import]uid: 31262 topic_id: 8366 reply_id: 30264[/import]
if you’re getting a table address for your object, but it reports “removeSelf” as a nil function, this means your display object has been removed from the table and basically the whole object ready for removal (most likely a previous call to removeSelf). I’m not sure why it’s getting called twice but try setting [lua]chesttop=nil[/lua] after your [lua]:removeSelf[/lua]
Basically display objects are a table with a proxy to the graphic and physics body… when you call removeSelf, the table isn’t removed immediately, hence why you get a table address but no methods. it’s basically an empty table… {}.
maybe you have some other listeners on it that need removing, or most likely you’re getting 2 collisions…
chesttop + other item
other item + chesttop
try printing out your collisions. it’s best to give each item a “name” or a “type” eg [lua]chesttop.me = “chesttop”[/lua] then you can print out [lua]event.other.me[/lua], [lua]event.object1.me[/lua] etc in your collisions to see what’s colliding with what
you’ll most likely be setting your timer to run twice (put a print statement in again to check this), one from each side of the collision.
My guess is that’s what’s calling it to fail as you’re running 2 timers and therefore trying to remove it twice
Actually chesttop doesn’t have any collision listeners or even physics associated with it. It basically just displays an image then later removes it at the end of the level. I do have other listeners which I haven’t removed yet. Still trying to figure out where to do it properly (opened a separate thread in director forum). I’ll set chesttop to nil as well and give that a try. [import]uid: 31262 topic_id: 8366 reply_id: 30310[/import]
I’ll give it a try and see if it makes a difference. [import]uid: 31262 topic_id: 8366 reply_id: 30150[/import]