• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Crashing when updating the User Interface from a detached NSThread
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Crashing when updating the User Interface from a detached NSThread


  • Subject: Crashing when updating the User Interface from a detached NSThread
  • From: Simone Manganelli <email@hidden>
  • Date: Thu, 2 Feb 2006 01:43:42 -0800

I'm having a particular problem with using NSThreads. I'm detaching a method that runs in a separate thread, but in the process of this method, it needs to update the user interface a bit. (I'm multithreading the app because this method takes a particularly long time to execute and I want the user interface to be responsive.) Whenever this detached thread tries to update the user interface, it seems to crash a lot.

To give a specific reason why it's necessary to update the user interface inside this method, consider this scenario: I'm trying to create an image from a movie by laying out each of the frames next to each other in an image. But I want the user to know how far the process has progressed, so I want the movie view that I'm using to step forward and display the current frame that it's processing. I also want to update an NSImageView to show the current assembled image in a preview window.

Are there ways to export drawing commands back to the main application thread so that the application doesn't crash? I tried using an NSNotification, but that doesn't seem to work.

-- Simone Manganelli
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden


  • Follow-Ups:
    • Re: Crashing when updating the User Interface from a detached NSThread
      • From: Glen Simmons <email@hidden>
  • Prev by Date: drawing/graphing package
  • Next by Date: Re: Spotlight importer question
  • Previous by thread: Re: drawing/graphing package
  • Next by thread: Re: Crashing when updating the User Interface from a detached NSThread
  • Index(es):
    • Date
    • Thread