• 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
Re: Cannot get pixel color from NSBitmapImageRep
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Cannot get pixel color from NSBitmapImageRep


  • Subject: Re: Cannot get pixel color from NSBitmapImageRep
  • From: David Hirsch <email@hidden>
  • Date: Thu, 01 Oct 2009 08:12:20 -0700

Jonathan, Dave-
Nothing works yet. Dave's NSLog statement prints "NSCalibratedRGBColorSpace 0 0 0 0", and restoring the graphics context does not help the problem. Still stumped.
-Dave


This is just as guess, but perhaps there's an issue with the drawing not being completed and flushed back to the bitmap buffer. Have you tried restoring the graphics context prior to querying for the pixel value?


-getRed:... accepts CGFloats as arguments, not floats. Depending on
your architecture, you're supplying a pointer to an incorrectly-sized
variable, and the bug you're seeing is the result of this error.

If you NSLog(@"%@", pixelColor); you'll see that the color is in fact correct.





_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden


  • Follow-Ups:
    • [Enigmatic semi-solution] Re: Cannot get pixel color from NSBitmapImageRep
      • From: David Hirsch <email@hidden>
References: 
 >Cannot get pixel color from NSBitmapImageRep (From: David Hirsch <email@hidden>)
 >Re: Cannot get pixel color from NSBitmapImageRep (From: Dave Keck <email@hidden>)

  • Prev by Date: Re: NSValueTransformer problem with NSTextField update
  • Next by Date: Re: Deleting CalTasks through an Array.
  • Previous by thread: Re: Cannot get pixel color from NSBitmapImageRep
  • Next by thread: [Enigmatic semi-solution] Re: Cannot get pixel color from NSBitmapImageRep
  • Index(es):
    • Date
    • Thread