AS3 Error #1009

• CyBrain

  I'm running a simple flash movie to mentally prepare myself for a larger application of an array in a website. Here's an array of 10 buttons which position correctly.

  http://talesfromthehead.com/rand…

  and here is my document class:
  http://pastebin.com/f61762b06

  After a for loop generates 10 squares, I randomly drop one of them down 5 pixels. (to prove I can reference each by array index). It all works fine except about 10% of the time, I get good old "error #1009 Cannot access a property or method of a null object reference. at ArrayNests()" (very informative)

  I'm guessing that you have to wait for ThePressBtnsMC class to load and that I would need some kind of init eventListener. Anyone have and example of how that could be done?

  CyBrain

  Flag

• skelly_b0

  I think it's because you're populating the array from 1 instead of 0. Then your Math.floor random call at the bottom is occasionally looking for an object at 0.

  I'm assuming that class is compiled so nothing to load.

  skelly_b 0Permalink

  UpvoteDownvote

  Dogear

  Flag

  • Yeah, changing from floor to ceil fixed everything. Thanks.CyBrain

  Show [[ numHiddenNotes ]] more notesAdd Note

  SaveCancel

• CyBrain0

  Uh... nevermind, I was exactly right about this being wrong 10% of the time. When I used the line
  pressBtn_array[Math.floor(Math.r... * pressBtnTotal)].y += 5;

  floor was creating an index result of 0 and my for loop went from 1 to 10. I initialized the array with null as the zeroeth entry — hence the "null object reference".

  CyBrain 0Permalink

  UpvoteDownvote

  Dogear

  Flag

  Show [[ numHiddenNotes ]] more notesAdd Note

  SaveCancel

• Autokern0

  Yep exactly.
  When navigating/populating you array do this:
  for (var i:uint = 0; i < pressBtnTotal; i++)
  So you'll populate the thing starting from 0 which will give you less headaches

  Autokern 0Permalink

  UpvoteDownvote

  Dogear

  Flag

  • In general, keeping things zero-based will make life simpler.acrossthesea

  Show [[ numHiddenNotes ]] more notesAdd Note

  SaveCancel