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Leopard Technical Q&As: Cocoa
File management consists of storing persistent information on a physical medium and retrieving that information later. Cocoa provides several programming interfaces for gaining access to stored files, folders, and disc recordings. Developers can also create and display dialogs that solicit choices from users when they are opening and saving files.

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Avoiding the -42 error with DiscRecording (HTML)
QA1292: Explains how to workaround the -42 error when using the DiscRecording API.
2004-05-25
Expanding Tilde-based paths (HTML)
QA1549: Demonstrates how to resolve tilde-based relevant paths.
2008-09-08
FSSetCatalogInfo versus UID and GID (HTML) (日本語 HTML)
QA1251: Describes why FSSetCatalogInfo does not set the UID and GID of the file, and provides a work around.
2003-03-26
NSOpenPanel - Choosing any file and ignoring packages (HTML)
QA1468: Explains how to configure NSOpenPanel to filter only files and ignoring packages.
2007-01-25
Sorting Like the Finder (HTML)
QA1159: Shows how to sort strings like the Finder's list view.
2004-10-27
Third party VFS can't unmount on Mac OS X 10.3 (HTML)
QA1308: Describes changes in unmounting behavior for VFS plug-ins under Mac OS X 10.3 "Panther."
2003-10-23
Using UTIs to Identify Image Files (HTML)
QA1518: Explains how to use Uniform Type Identifiers to identify what files can be opened at images.
2007-05-11
Weak Linking To Spotlight (HTML)
QA1422: Describes a problem with weak linking to Spotlight (the Metadata framework), and its solution.
2005-06-03