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Technical Q&As are short question and answer formatted pages that provide answers to questions frequently received at Apple Developer Technical Support.

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Using static versions of existing dynamic libraries (HTML)
QA1393: Illustrates how to select a static version of a library when a dynamic version of the library exists.
Tools 2006-10-24
Java on Intel-based Macs (HTML)
QA1295: Required changes (if any) for Java applications to run on Intel-based Macs.
Java, Porting, Tools 2006-10-17
Mixing AWT/Swing and Cocoa-Java (HTML)
QA1342: Recommended alternatives to mixing Cocoa-Java and AWT/Swing.
Java 2006-10-12
Finding EXC_BAD_ACCESS bugs in a Cocoa project (HTML)
QA1367: Discusses how to find memory protection violations or EXC_BAD_ACCESS bugs in Cocoa projects.
Cocoa 2006-10-10
What is the "main bundle" of a command-line foundation tool? (HTML)
QA1436: Reveals the location of the main bundle of a command-line foundation tool.
Cocoa 2006-10-10
How to make NSTextField accept tab, return and enter keys. (HTML)
QA1454: Describes how to make the NSTextField control accept tab, return and enter keys by using the control's dispatch delegate method.
Cocoa, Text & Fonts, User Experience 2006-10-09
Interface element identification in Interface Builder (HTML)
QA1323: Describes a way to easily visually identify interface elements in a nib file.
Tools 2006-10-06
Building Objective-C static libraries with categories (HTML)
QA1490: Describes how to properly build Objective-C static libraries that contain categories on existing classes.
Cocoa, Tools 2006-10-03
Programmatically Accessing and Manipulating Multiple Keychain Items (HTML)
QA1486: An explanation on what is and is not possible using the SecKeychain API to manipulate Keychain Items.
Cocoa, Enterprise IT, Mac OS X Server, Security 2006-10-03
The state of mDNSResponder (HTML)
QA1339: Explains how to obtain information regarding the internal state of mDNSResponder.
Darwin, Hardware & Drivers, Networking 2006-10-03
Compression Sessions - Multipass encoding and the pass mode flags (HTML)
QA1457: Discusses how the pass mode flags work when performing multipass compression operations.
Carbon, QuickTime 2006-10-02
Embedding Hyperlinks in NSTextField and NSTextView (HTML)
QA1487: Shows how a Cocoa app can embed a hyperlink inside both NSTextField and NSTextView using NSAttributedString.
Cocoa, User Experience 2006-10-02
Where are the LiveConnect classes on Mac OS X? (HTML)
QA1364: Locating classes necessary to build Java-Javascript communication into Java Applets on Mac OS X.
Enterprise IT, Internet & Web, Java 2006-10-02
Disabling and Enabling an NSTextView (HTML)
QA1461: Shows how a Cocoa application can disable and enable an NSTextView.
Cocoa, Text & Fonts, User Experience 2006-09-11
Programmatically Performing an Open Directory Search (HTML)
QA1462: A short guide on how to programmatically search Open Directory for matching attribute values within records.
Core Foundation, Enterprise IT, Internet & Web, Mac OS X Server 2006-09-11
How to create a Cocoa Disclosure Button Control (HTML)
QA1485: Explains how to create a disclosure button control in Cocoa, not immediately available in Interface Builder.
Cocoa 2006-08-01
MovieAudioExtraction - Extracting all available audio samples (HTML)
QA1481: Describes how to correct for MovieAudioExtraction missing some audio samples at the end of audio files.
Audio, QuickTime 2006-07-18
Losing the character code when using the control key (HTML)
QA1446: Explains why the control key transforms the character code instead of simply setting the appropriate modifier bit.
Carbon, Text & Fonts 2006-07-17
How do I use asserts while debugging? (HTML)
QA1431: How do I enable asserts so they log their messages and/or break when I'm debugging?
Tools 2006-06-30
QuickTime Audio - Retrieving the correct audio format bit depth value (HTML)
QA1477: Discusses how to retrieve accurate audio format bit depth.
Audio, QuickTime 2006-05-17
Is dlopen available on all versions of Mac OS X? (HTML) (日本語 HTML)
QA1180: Describes how to dynamically link to libraries and plug-ins, typically done with dlopen.
Darwin, Open Source 2006-05-11
Changing the volume of audio devices (HTML)
QA1016: Demonstrates volume controls for audio devices
Audio, Carbon 2006-05-02
Tips for searching Headers, APIs and ADC reference material. (HTML)
QA1475: Presents a number of different ways to search for APIs and reference material on the system.
Tools 2006-04-27
Enumerating fonts with ATS (HTML)
QA1471: Describes the different ATS font enumeration methods
Carbon, Text & Fonts, User Experience 2006-04-14
UnsupportedClassVersionError With J2SE 5.0 Release 4 (HTML)
QA1474: Explains problems running existing Xcode projects after upgrading to J2SE 5.0 Release 4
Java, Tools 2006-04-14
Using the kQTPropertyClass_DRM properties with QuickTime (HTML)
QA1476: Explains how to use the kQTPropertyClass_DRM properties with QuickTime media.
QuickTime 2006-04-11
CoreAudio Overload Warnings (HTML)
QA1467: Describes CoreAudio overload warnings what they mean and how to avoid them.
Audio, Carbon, Cocoa 2006-03-29
MovieAudioExtraction - Ensure a Movie is fully loaded before starting an extraction session (HTML)
QA1469: Describes the importance of making sure a Movie is fully loaded before extracting audio.
Audio, Cocoa, QuickTime 2006-03-29
Using NSSound with CoreAudio on Mac OS 10.3.x (HTML)
QA1394: Workaround the NULL input buffers in a Core Audio IOProc callback when using NSSound by using AudioDeviceAddIOProc
Audio, Cocoa 2006-03-29
Creating a Movie from Movie Data in Memory (HTML)
QA1341: Describes how to create a movie from movie data in memory.
QuickTime 2006-03-21
ColorSync Color Matching on Intel-based Macs (HTML)
QA1464: Describes special considerations for byte ordering when performing ColorSync color matching on Intel-based Macs
Carbon, Graphics & Imaging 2006-03-16
Movie Export From Procedures - Providing k2vuyPixelFormat data to MovieExportGetDataProc (HTML)
QA1465: Discusses adding the missing 'rowb' ImageDescription extension when using MakeImageDescriptionFromPixMap with a k2vuyPixelFormat GWorld for a procedures export.
QuickTime 2006-03-03
Common QA and Roadmap for USB Software Development on Mac OS X (HTML)
QA1370: Roadmap for development of USB Software on Mac OS X and some Common Questions and Answers
Hardware & Drivers, Performance, Tools 2006-02-28
The "packages" node in the device tree (HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
Audio, Graphics & Imaging, Hardware & Drivers, Mac OS X Server, Networking, Performance, QuickTime 2006-02-22
Is QuickTime thread-safe? (HTML)
QA1088: Discusses thread-safety and reentrancy of the QuickTime library on both Mac & Windows.
QuickTime 2006-02-14
Integrating the QuickTime for Windows 7.0.3 Installer into your Application Installer (HTML)
QA1463: Describes new behavior for the QuickTime for Windows 7.0.3 Installer
QuickTime 2006-02-07
Sequence Grabber preallocates large file when recording (HTML)
QA1411: Describes how to prevent the Sequence Grabber from filling your entire disk when recording.
Carbon, QuickTime 2006-02-06
QuickTime Audio - Easy Frequency Level Metering with MovieAudio APIs (HTML)
QA1459: Describes how to perform frequency band level metering using MovieAudio metering APIs.
Audio, Carbon, Cocoa, QuickTime 2006-01-26
Compression Sessions - Configuring options using the Standard Compression dialog (HTML)
QA1456: Discusses how to configure Compression Session options using Standard Compression dialog.
Carbon, QuickTime 2006-01-12
Compression Sessions - Enabling muti-pass encoding (HTML)
QA1450: Describes how to enable multi-pass encoding when using ICM compression sessions.
Carbon, QuickTime 2006-01-12
Compression Sessions - Temporal compression options (HTML)
QA1455: Discusses the temporal compression option as it relates to quality and other compression session options.
Carbon, QuickTime 2006-01-12
Debugging Graphics with QuartzDebug (HTML) (日本語 HTML)
QA1236: Explains how to use QuartzDebug to debug graphics issues.
Carbon, Cocoa, Games, Graphics & Imaging, Java, Performance 2006-01-12
Decompression Sessions - Setting codec accuracy and field mode (HTML)
QA1460: Describes how to set codec accuracy and field mode options when creating a decompression sessions.
Carbon, Graphics & Imaging, QuickTime 2006-01-12
Limiting the component list in SCRequestImageSettings (HTML)
QA1062: Describes the scCompressionListType flag, which limits the list of compressors shown in the standard image settings dialog.
QuickTime 2006-01-12
Deprecated CALL_ON_[UN]LOAD pragmas (HTML)
QA1429: Replace deprecated CALL_ON_[UN]LOAD pragmas with constructor [destructor] function attributes.
Tools 2006-01-10
Setting default open Finder window (HTML)
QA1449: How to set the default Finder window to open when a disk is mounted
Carbon, Tools, User Experience 2006-01-03
How can I handle smooth mouse wheel scrolling? (HTML)
QA1453: Details an undocumented Carbon Event which will be added to the public headers in a later DevTools release.
Carbon 2005-11-29
Sound Manager Codec support in QuickTime 7 (HTML)
QA1448: Describes QuickTime 7 support for constant bitrate and variable bitrate Sound Manager codecs
Audio, QuickTime 2005-10-26
Final Cut Pro - Preferred Video Media Time Scales and Sample Durations (HTML)
QA1447: Lists the preferred time scales/sample durations for media created for use with FCP.
Apple Applications, QuickTime 2005-10-24
Apple RGB and Generic RGB profiles explained (HTML)
QA1430: Discusses use of the Apple RGB and Generic RGB profiles for untagged data on Mac OS X
Graphics & Imaging 2005-10-17
Compression Sessions - Configuring codec quality settings (HTML)
QA1444: Discusses how to set encoding quality for a Compression Sequence
Carbon, Graphics & Imaging, QuickTime 2005-10-17
Importer Components - What is the 'mcfg' resource used for? (HTML) (日本語 HTML)
QA1267: Discusses the Media Configuration 'mcfg' resource which lists Importer Component file type characteristics and its use.
QuickTime 2005-10-17
Registering and unregistering for sleep notifications (HTML)
QA1340: Explains how applications can register and unregister for sleep notifications on Mac OS X.
Carbon, Cocoa, Core Foundation, Darwin 2005-10-17
Creating color spaces that ensure color matching. (HTML)
QA1396: How to create color spaces that ensure color matching.
Graphics & Imaging 2005-10-04
QuickTime for Windows returns bdNamErr (-37) error with long Windows file names (HTML)
QA1413: Describes how QuickTime may return bdNamErr (-37) error on Windows if file name is > 63 characters
QuickTime 2005-10-04
StopAlert and NoteAlert now use the Application icon (HTML)
QA1378: System Alerts now use the Application icon to let the User easily identify the source of the alert.
Carbon, User Experience 2005-10-04
Using the QuickTime DVCompressor properties (HTML)
QA1438: Describes the function of the DVCompressor class component properties.
QuickTime 2005-10-04
How can I add the ability to read and write Keynote 2 documents to my application? (HTML)
QA1412: Describes where to find information about the Keynote 2 file format.
Apple Applications 2005-09-13
Implementing a CVFillExtendedPixelsCallBack (HTML)
QA1440: Discusses how you implement a Core Video custom extended pixel fill callback function.
Carbon, Graphics & Imaging, QuickTime 2005-09-06
Registering custom pixel formats with QuickTime and Core Video (HTML)
QA1401: Discusses how to register custom pixel formats with QuickTime & Core Video with QuickTime 7.
Carbon, Graphics & Imaging, QuickTime 2005-09-06
Adding Unicode characters to Text Media in a Text Track (HTML)
QA1400: Describes how to add Unicode characters to text media in a text track
QuickTime 2005-09-01
Specifiying if the CPU or the GPU should be used for rendering. (HTML)
QA1416: Which processor will be used for rendering in Core Image and how to affect it.
Graphics & Imaging, Hardware & Drivers, Performance 2005-08-16
Combinations of cupsColorSpace, cupsColorOrder and cupsBitsPerColor values supported by Mac OS X (HTML)
QA1368: Table of supported combinations of cupsColorSpace, cupsColorOrder and cupsBitsPerColor values supported by Mac OS X.
Printing 2005-08-10
Why am I not receiving kEventControlHit events for some of the parts of my custom HIView? (HTML)
QA1439: Explains why part codes greater than 127 should not be used
Carbon 2005-07-14
Mixing link-local IP addresses and routable IP addresses (HTML)
QA1357: Explains how to enable communication between devices with link-local addresses and devices with routable addresses.
Darwin, Hardware & Drivers, Networking, Printing 2005-07-06
Problems getting Bonjour TXT record information (HTML)
QA1389: Explains why you might have problems retrieving TXT record information from a CFNetServiceRef or NSNetService.
Carbon, Cocoa, Core Foundation, Networking 2005-07-06
What are the predefined macros for GCC? (HTML)
QA1424: Shows how to display a list of GCC predefined macros.
Tools 2005-07-06
Right- and Control-Drags on Mac OS X (HTML)
QA1362: Describes a difference in Drag and Drop on Mac OS X that affects all cross-platform Java applications
Java 2005-06-29
When does the RSS Feed patch in Quartz Composer refreshes its contents? (HTML)
QA1425: Explains how the RSS Feed patch in Quartz Composer refreshes its contents.
Graphics & Imaging 2005-06-24
Carbon Drawer problem in Mac OS X v10.4 and v10.4.1 (HTML)
QA1435: Workaround for a drawer problem present in Mac OS X v10.4 but fixed in v10.4.2
Carbon 2005-06-21
Unified window title and toolbar appearance in Carbon (HTML)
QA1423: How to use the unified window title and toolbar appearance for a Carbon window.
Carbon, User Experience 2005-06-17
What is the Timebase submenu available in the contextual menu of some patches in Quartz Composer? (HTML)
QA1427: Describes the timebase system used by patches in Quartz Composer.
Apple Applications, Graphics & Imaging, Tools 2005-06-15
Weak Linking To Spotlight (HTML)
QA1422: Describes a problem with weak linking to Spotlight (the Metadata framework), and its solution.
Carbon, Cocoa 2005-06-03
How can I optimize a Quartz Composer composition depending on the hardware it runs on? (HTML)
QA1433: Explains how to design compositions that adapt to the hardware limitations.
Apple Applications, Cocoa, Graphics & Imaging, Performance 2005-06-01
Why does my Quartz Composer composition render with a corrupted background in the QCView? (HTML)
QA1434: Describes the circumstances in which the QCView background may render corrupted.
Graphics & Imaging 2005-06-01
Sending SCSI or ATA commands to storage devices (HTML) (日本語 HTML)
QA1179: Explains that Mac OS X does not implement SCSI or ATA pass-through for many mass storage devices.
Hardware & Drivers, Mac OS X Server 2005-05-10
Loading Scripting Additions in Mac OS X (HTML)
QA1070: Explains how to load scripting additions so you can call them using Apple events.
Scripting & Automation 2005-05-06
Why is libstdc++.a missing in my Xcode project on Mac OS X v10.4 (Tiger)? (HTML)
QA1428: Explains the role of libstdc++ and why you do not need it in a Xcode project.
Tools 2005-04-29
Why is my Control/HIView not accepting drops on Mac OS X v10.4 (Tiger)? (HTML)
QA1426: Explains how to handle correctly the kEventControlDragEnter event so drops will work in a Control or HIView.
Carbon 2005-04-29
iSight - Configuring gain settings for IIDC cameras (HTML)
QA1421: Discusses how to configure features of IIDC cameras, specifically gain for the iSight
Carbon, Hardware & Drivers, QuickTime 2005-04-06
Crash in ABAddPropertiesAndTypes (HTML)
QA1404: How to correctly add custom Address Book properties using ABAddPropertiesAndTypes
Apple Applications, Carbon, Cocoa, User Experience 2005-04-04
Help Book Caching During Software Development (HTML)
QA1409: Development situations that can potentially confuse Help Viewer
Carbon, Cocoa, Tools, User Experience 2005-03-30
Defining and Using the kTransformFocused IconTransformType (HTML)
QA1414: Documents a new IconTransformType, available in Panther and later, which draws a focus ring around an icon.
Carbon 2005-03-29
Using ConvertMovieToFile or ConvertMovieToDataRef to convert movies without displaying the settings dialog (HTML)
QA1418: Describes how to perform movie export using ConvertMovieToFile or ConvertMovieToDataRef without displaying the dialog
QuickTime 2005-03-22
Finding an NSView's current magnification. (HTML)
QA1346: How to discover the current magnification (zoom level) of any NSView.
Cocoa, Graphics & Imaging, User Experience 2005-03-08
Movie Export Component - How to ensure Final Cut Pro recognizes your exporter (HTML)
QA1415: Explains how to make sure Final Cut Pro will recognizes a custom QuickTime movie export component.
Apple Applications, Carbon, QuickTime 2005-03-08
Determine the version of an Audio Unit (HTML)
QA1408: Determine the version of an Audio Unit
Audio 2005-03-07
Movie Export - Always fill in the MovieExportGetDataParams dataSize field (HTML)
QA1304: Outlines the importance of correctly filling in the MovieExportGetDataParams dataSize field when exporting from procedures.
Carbon, QuickTime 2005-02-25
Storing file references in CFPreferences (HTML)
QA1350: Storing file references in CFPreferences
Carbon 2005-02-23
CFBundleIdentifier and user application access (HTML)
QA1373: Describes the role of CFBundleIdentifier in limiting a user's application access.
Carbon, Cocoa, Core Foundation, Enterprise IT, Java, Tools 2005-02-08
Public UTIs supported by Mac OS X v10.3 (HTML)
QA1406: Lists the public UTIs (Uniform Type Identifiers) used by the Pasteboard in Mac OS X v10.3.
Carbon, Cocoa 2005-02-08
Context Sharing Tips (HTML) (日本語 HTML)
QA1248: How to correctly share OpenGL contexts and what the limits on this sharing are.
Carbon, Games, Graphics & Imaging 2005-02-07
Variable arguments in Objective-C methods (HTML)
QA1405: How to implement methods which take a variable number of arguments.
Cocoa 2005-01-13
Resolves may return an IPv6 address in Panther (HTML)
QA1298: Explains why you get an IP address of 0.0.0.0 when resolving a Bonjour service.
Carbon, Cocoa, Core Foundation, Networking 2005-01-10
Mach Absolute Time Units (HTML)
QA1398: Describes how to convert Mach absolute time units to real time, and vice versa.
Darwin 2005-01-06
Sequence Grabber - Determining the capture resolution of an IIDC device (HTML)
QA1403: Discusses how to determine the resolution of a captured image from an IIDC device
Carbon, Hardware & Drivers, QuickTime 2005-01-06
NSOpenGLView redraw problems after a window is closed and re-opened. (HTML)
QA1353: Workaround for NSOpenGLView failure to draw after its window is closed and re-opened.
Cocoa, Graphics & Imaging 2004-12-03
Hang launching signed Applets from JavaScript (HTML)
QA1395: Making a LiveConnect call to a signed Applet before that Applet has finished loading can cause a hang.
Internet & Web, Java 2004-12-02
Why aren't my tracking rects working? (HTML)
QA1355: Describes a common mistake in setting up cursor-tracking rectangles.
Cocoa 2004-12-02
Obtaining the name of an external MIDI Device from a MIDI Endpoint (HTML)
QA1374: Get the names of external MIDI Devices from MIDI Endpoints.
Audio, Hardware & Drivers 2004-12-01