Technical Q&As
This page lists new and recently changed Technical Q&As.

Items are listed in reverse chronological order by publication date. To see the list sorted by the type of revision, click Sort by Revision Type. Items published for the first time (First Version) will be at the top of the list, followed by items with new or changed content (Content Update), followed by items with small fixes, such as typos and format errors, but no significant content changes (Minor Change).

New and updated Technical Q&As are announced in the weekly Apple Developer Connection News, available as an option to ADC members. See the Membership Overview page for details on joining.
Document Revision Descriptions
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2005-01-13 Variable arguments in Objective-C methods (HTML)
First Version
 First Version Objective-C Language
2004-12-03 NSOpenGLView redraw problems after a window is closed and re-opened. (HTML)
First Version
 First Version Graphics & Imaging
2004-12-02 Why aren't my tracking rects working? (HTML)
First Version
 First Version Events & Other Input, User Experience
2004-12-01 OpenGL Sample Code (HTML)
First Version
 First Version Games, Graphics & Imaging
2004-11-05 Sending an Email (HTML)
First Version
 First Version Interapplication Communication, Internet & Web, Networking
2004-10-27 Sorting Like the Finder (HTML)
First Version
 First Version File Management, Text & Fonts
2004-10-25 Registering for sleep notifications (HTML)
First Version
 First Version Resource Management
2004-10-22 Preventing sleep (HTML)
First Version
 First Version Resource Management
2004-10-11 How do I determine how much VRAM is available on my video card? (HTML)
First Version
 First Version Graphics & Imaging
2004-10-04 NSTimers and Rendering Loops (HTML)
First Version
 First Version Events & Other Input, Games, Graphics & Imaging
2004-09-14 Movies - Saving movie playback hints (HTML)
First Version
 First Version QuickTime
2004-09-08 Setting the ColorSync profile for a NSBitmapImageRep object (HTML)
First Version
 First Version Graphics & Imaging
2004-10-28 Using Interface Builder's NSOpenGLView or Custom View objects for an OpenGL application (HTML)
Edited out the capital 'I' in NSOpenGLPixelFormat, Edited code block for -awakeFromNib to be more accurate, Edited code block to add the @interface section to show an instance variable, Added additional descriptive information regarding a dragged-in NSOpenGLView, Added 'NOTE:' box for text following code listing
 Content Update Graphics & Imaging
2004-09-09 CGBitmapContextCreate Supported Color Spaces (HTML)
Removed two combinations in the Gray color space that had been incorrectly documented as supported.
 Content Update Games, Graphics & Imaging
2004-07-14 Rendezvous enforces the TXT record format in Panther (HTML)
Updated TXT record example
 Content Update Networking
2004-07-13 Getting a Packet Trace (HTML) ()
Added a reference to FrameSeer. Converted text to TNT and fixed formatting and link problems.
 Content Update Internet & Web, Networking
2005-01-10 Resolves may return an IPv6 address in Panther (HTML)
Updated example code to be more robust against changes in callback behavior that might occur in the future.
 Minor Change Networking
2004-12-13 Finding an NSView's current magnification. (HTML)
There was a mistake in the implementation of -resetScaling. I was doing a -convertSize:toView: that should have been a -convertSize:fromView:
 Minor Change Graphics & Imaging, User Experience
2004-07-14 Updating the TXT record of a Rendezvous service (HTML)
Simplified description of work around.
 Minor Change Networking