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 bi-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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2008-08-27 Getting the pixel data from a CGImage object (HTML)
Updated to refer to CGDataProviderCopyData(), available as of Mac OS X 10.5.
 Content Update Games, Graphics & Imaging
2008-08-08 Gathering all PostScript Printer Descriptions (PPDs) (HTML)
Note that this issue has been resolved for Mac OS X 10.5
 Minor Change Printing
2008-08-08 Registering and unregistering for sleep and wake notifications (HTML)
Added information about forced/idle sleep, how to receive sleep/wake notification in Cocoa, and expanded IOKit sample to include wake messages and IOPMAssert.
Content Update Resource Management
2008-08-08 Requirements for Quartz GL (HTML)
Document the QuartzGLEnable property list key and HIWindowSetBackingLocation(). Fixed typos.
 Content Update Games, Graphics & Imaging, Performance, User Experience
2008-08-08 Using QTPixelBufferContextCreate with NewMovieFromProperties (HTML)
Editorial
 Minor Change QuickTime
2008-06-03 Getting a Packet Trace (HTML) (日本語 HTML)
Streamlined product descriptions and reorganized the Miscellaneous notes. Restructured entire document and added additional packages. Added additional Hub/Switch information.
 Minor Change Internet & Web, Networking
2008-04-14 Determining console user login status (HTML)
A complete rewrite to account for fast user switching, and to simplify the code.
 Minor Change Process Management
2008-03-25 Bonjour Printer Subtype for HTTP (HTML)
Restructured the document to clarify possible ambiguities.
 Minor Change Networking
2008-03-11 How to work around HIMovieViewCreate failing (HTML)
Editorial
 Minor Change QuickTime
2008-03-11 Suppressing the "unexpectedly quit" alert (HTML)
Updated content for Mac OS X 10.4 and 10.5. Fixed a typographical error. "~Library/Preferences/com.apple.CrashReporter.plist" should be "~/Library/Preferences/com.apple.CrashReporter.plist."
 Minor Change User Experience
2008-02-20 Customizing Process Stack Size (HTML)
Updated NSThread section for Leopard.
 Minor Change Process Management, Resource Management
2008-01-23 Programmatically causing restart, shutdown and/or logout (HTML) (日本語 HTML)
Added information for daemon authors.
 Content Update Events & Other Input, Process Management, Resource Management