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Core Foundation is a framework that provides fundamental software services. Developers can use Core Foundation to build cross-platform applications and can share code and data among frameworks, libraries, and applications. Core Foundation provides abstractions for common data types, facilitates internationalization through Unicode string storage, and offers a suite of utilities.

A guided introduction and learning path for developers new to Core Foundation.   Essential information for developers using the Core Foundation framework.   C API references organized by framework.
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Designing Network-Friendly Applications (HTML)
Learn to make your application management-aware and reliably accessible on a network.
Design Guidelines Articles 2005-10-24
Creating Cross-Platform Applications with Core Foundation and Open Source (HTML)
Learn how to import and export data types across a range of platforms using CF-Lite.
Design Guidelines Articles 2005-04-11
Tiger Develop Overview Series: Working with Spotlight (HTML)
Learn to make the most of Spotlight's powerful search technologies within your own applications.
File Management Articles 2004-10-07
Locales Programming Guide (HTML) (PDF)
Explains how to use locales to retrieve, interpret, and display localized information in Core Foundation.
Design Guidelines, Internationalization Guides 2008-07-11
Xcode Unit Testing Guide (HTML) (PDF)
Explains how to incorporate unit tests into your development process using Xcode.
Design Guidelines Guides 2008-05-02
CFNetwork Programming Guide (HTML) (PDF)
Explains how to use Core Foundation networking functions to work with low-level BSD sockets.
Networking Guides 2008-03-11
File System Events Programming Guide (HTML) (PDF)
Explains how applications can detect changes in the file system.
File Management Guides 2008-03-11
Strings Programming Guide for Core Foundation (HTML) (PDF)
Explains how to create, manipulate, and search strings in Core Foundation, and how strings interact with encodings and character sets.
Data Management, Internationalization Guides 2008-03-11
Threading Programming Guide (HTML) (PDF)
Explains how to use threads in Cocoa applications.
Performance, Process Management Guides 2008-02-08
Resource Programming Guide (HTML) (PDF)
Explains how to work with nib and bundle resources in Mac OS X applications.
Resource Management Guides 2007-09-04
Attributed Strings Programming Guide (HTML) (PDF)
Explains how to use attributed strings, which manage attributes of character strings or individual characters.
Data Management, Text & Fonts Guides 2007-06-04
Dictionary Services Programming Guide (HTML) (PDF)
Explains how to create a dictionary and access it programmatically.
Text & Fonts Guides 2007-05-30
Spotlight Importer Programming Guide (HTML) (PDF)
Describes the role of metadata importers and how to write them.
File Management Guides 2007-05-27
Spotlight Overview (HTML) (PDF)
Introduces the main components and services of Apple's metadata technology.
Design Guidelines Guides 2007-05-27
Identity Services Programming Guide (HTML) (PDF)
Explains how identities work and how to use them in applications.
Networking Guides 2007-05-15
Memory Management Programming Guide for Core Foundation (HTML) (PDF)
Explains how to allocate and deallocate objects in Core Foundation.
Resource Management Guides 2007-04-03
Data Formatting Guide for Core Foundation (HTML) (PDF)
Explains how to use Core Foundation formatters to create and validate text in text fields and other cells.
Data Management Guides 2006-12-21
Performance Overview (HTML) (PDF)
Introduces the factors that determine performance.
Performance Guides 2006-10-03
Preferences Programming Topics for Core Foundation (HTML) (PDF)
Explains how to manage Core Foundation user preferences.
Data Management Guides 2006-10-03
XML Programming Topics for Core Foundation (HTML) (PDF)
Explains how to parse XML documents into structured objects.
Data Management, Internet & Web Guides 2006-10-03
Memory Usage Performance Guidelines (HTML) (PDF)
Guidelines for improving the performance of memory-related code.
Performance Guides 2006-06-28
Launch Time Performance Guidelines (HTML) (PDF)
Guidelines for improving the launch performance of an application.
Performance Guides 2006-04-04
Spotlight Query Programming Guide (HTML) (PDF)
Describes how to add Spotlight searching to your applications.
File Management Guides 2006-03-08
Property List Programming Topics for Core Foundation (HTML) (PDF)
Explains how to use structured, textual representations of data in Core Foundation.
Data Management Guides 2006-02-07
Binary Data Programming Guide for Core Foundation (HTML) (PDF)
Explains how to create and use Core Foundation data objects, object-oriented wrappers for byte buffers.
Data Management Guides 2006-01-10
Bundle Programming Guide (HTML) (PDF)
Explains how to use Core Foundation bundle objects to organize resources.
Resource Management Guides 2005-11-09
Internationalization Programming Topics (HTML) (PDF)
Explains how to support multiple languages in software.
Internationalization Guides 2005-09-08
Core Foundation Design Concepts (HTML) (PDF)
Explains the fundamental design concepts that underlie all Core Foundation programming interfaces.
Design Guidelines Guides 2005-08-11
Dates and Times Programming Guide for Core Foundation (HTML) (PDF)
Explains how to manage Core Foundation dates and times.
Data Management, Internationalization Guides 2005-08-11
Code Speed Performance Guidelines (HTML) (PDF)
Guidelines for improving the performance and efficiency of code.
Performance Guides 2005-07-07
File-System Performance Guidelines (HTML) (PDF)
Guidelines for improving the performance of file-related code.
Performance Guides 2005-07-07
Plug-ins (HTML) (PDF)
Explains how to use the plug-in architecture provided by Core Foundation.
Process Management Guides 2005-03-03
Collections Programming Topics for Core Foundation (HTML) (PDF)
Explains how to group objects in arrays, sets, or dictionaries in Core Foundation.
Data Management Guides 2003-08-07
Debugging Programming Topics for Core Foundation (HTML) (PDF)
Tips and techniques for debugging Core Foundation code.
Performance Guides 2003-01-17
Run Loops (HTML) (PDF)
Explains how Core Foundation run loops process input.
Events & Other Input, Process Management Guides 2003-01-17
CFFTPStream Reference (HTML) (PDF)
Describes the C API for communicating with FTP servers.
Networking Reference 2008-07-11
CFHost Reference (HTML) (PDF)
Describes the C API for acquiring host information.
Networking Reference 2008-07-11
CFHTTPMessage Reference (HTML) (PDF)
Describes the C API for creating, sending, receiving and manipulating HTTP messages.
Networking Reference 2008-07-11
CFNetDiagnostics Reference (HTML) (PDF)
Describes the C API for diagnosing and fixing network related problems.
Networking Reference 2008-07-11
CFURL Reference (HTML) (PDF)
Describes the opaque type for representing an URL.
General Reference 2008-07-11
CFHTTPStream Reference (HTML) (PDF)
Describes the CFStream functions for working with HTTP connections.
Networking Reference 2008-07-08
CFNetServices Reference (HTML) (PDF)
Describes the C API for implementing Bonjour functionality in an application.
Networking Reference 2008-07-08
CFNetwork Error Codes Reference (HTML) (PDF)
Describes error codes used by the CFNetwork API.
Networking Reference 2008-07-07
CFProxySupport Reference (HTML) (PDF)
Describes the CFProxySupport API, which provides functions for managing network proxy information.
Networking Reference 2008-07-07
CFMachPort Reference (HTML) (PDF)
Describes the opaque type for representing a native Mach port.
General Reference 2008-04-08
Core Services Identity Reference (HTML)
Describes the C API for creating, maintaining and finding users and groups.
Networking Reference 2008-04-08
FSEvents Reference (HTML)
Describes the API used to provide lightweight notification of directory changes in a file-system subtree.
File Management Reference 2008-04-08
JavaScriptCore Framework Reference (HTML)
Describes the API for evaluating JavaScript programs from within a C-based program
Internet & Web Reference 2008-04-08
CFString Reference (HTML) (PDF)
Describes the opaque type for representing an immutable character string.
General Reference 2008-03-11
CFDictionary Reference (HTML) (PDF)
Describes the opaque type for managing an immutable collection of key-value pairs.
General Reference 2007-10-31
CFStringTokenizer Reference (HTML) (PDF)
Describes the opaque typed used to break a string into tokens (sub-strings) on the basis of words, sentences, or paragraphs.
Data Management, Internationalization, Text & Fonts Reference 2007-10-31
Core Foundation Framework Reference (HTML) (PDF)
Describes the C API for the Core Foundation framework.
General Reference 2007-10-31
Preferences Utilities Reference (HTML) (PDF)
Describes Core Foundation preferences functions.
General Reference 2007-10-31
CFBundle Reference (HTML) (PDF)
Describes the opaque type for representing a resource directory hierarchy.
General Reference 2007-10-18
Time Utilities Reference (HTML) (PDF)
Describes Core Foundation time functions.
General Reference 2007-08-23
Core Foundation Reference Update (HTML) (PDF)
Summarizes the symbols added to the Core Foundation framework.
General Reference 2007-07-18
CFType Reference (HTML) (PDF)
Describes the CFType opaque type.
General Reference 2007-07-12
Dictionary Services Reference (HTML) (PDF)
Describes the Objective-C and C routines that support programmatic access to dictionaries.
Text & Fonts Reference 2007-05-29
CFDateFormatter Reference (HTML) (PDF)
Describes the opaque type for describing the textual representation of dates and times.
General Reference 2007-05-23
CFFileDescriptor Reference (HTML) (PDF)
CFFileDescriptor provides an opaque type to monitor file descriptors for read and write activity via CFRunLoop.
File Management Reference 2007-05-23
CFLocale Reference (HTML) (PDF)
Describes the opaque type for representing a locale.
General Reference 2007-05-23
CFNumberFormatter Reference (HTML) (PDF)
Describes the opaque type for describing the textual representation of numbers.
General Reference 2007-05-23
CFTimeZone Reference (HTML) (PDF)
Describes the opaque type used to represent time zones.
General Reference 2007-05-23
CFArray Reference (HTML) (PDF)
Describes the opaque for managing an immutable ordered collection of values.
General Reference 2007-05-22
CFBag Reference (HTML) (PDF)
Describes the opaque type for managing an immutable unordered collection of values that may contain duplicates.
General Reference 2007-05-22
Spotlight Metadata Attributes Reference (HTML) (PDF)
Describes the usage and types of metadata attributes for various file types used with Spotlight.
File Management Reference 2007-05-22
CFHTTPAuthentication Reference (HTML) (PDF)
Describes the C API for applying authentication credentials to HTTP messages.
Networking Reference 2007-05-15
Identity Services Reference Collection (HTML) (PDF)
Describes the APIs for using identities and the Identity Picker.
Networking Reference 2007-05-14
CFReadStream Reference (HTML) (PDF)
Describes the opaque type for reading a byte stream.
General Reference 2007-05-03
CFStream Reference (HTML) (PDF)
Describes the C API for using streams.
Networking Reference 2007-05-03
CFWriteStream Reference (HTML) (PDF)
Describes the opaque type used for writing a byte stream.
General Reference 2007-05-03
NSHost Class Reference (HTML) (PDF)
Describes the class used to get information about a network resource.
Networking Reference 2007-03-24
CFMessagePort Reference (HTML) (PDF)
Describes the CFMessagePort opaque type.
General Reference 2007-03-20
CFMutableData Reference (HTML) (PDF)
Describes the opaque type for representing a mutable byte buffer.
General Reference 2007-03-07
CFNotificationCenter Reference (HTML) (PDF)
Describes the opaque type for sending notifications to registered observers.
General Reference 2007-01-22
Core Foundation URL Access Utilities Reference (HTML) (PDF)
Describes Core Foundation URL access functions.
General Reference 2007-01-19
Base Utilities Reference (HTML) (PDF)
Describes basic Core Foundation functions.
General Reference 2007-01-15
CFUUID Reference (HTML) (PDF)
Describes the CFUUID opaque type.
General Reference 2007-01-15
CFCalendar Reference (HTML) (PDF)
Describes the opaque type for representing a calendar.
Internationalization Reference 2006-12-11
CFAllocator Reference (HTML) (PDF)
Describes the opaque type for allocating and deallocating memory.
General Reference 2006-12-08
CFRunLoop Reference (HTML) (PDF)
Describes the opaque type used to manage input sources for a task.
General Reference 2006-12-08
CFCharacterSet Reference (HTML) (PDF)
Describes the opaque type for representing an immutable set of Unicode characters.
General Reference 2006-12-01
CFNumber Reference (HTML) (PDF)
Describes the opaque type for representing numbers.
General Reference 2006-12-01
CFMutableString Reference (HTML) (PDF)
Describes the opaque type for representing a mutable character string.
General Reference 2006-11-30
Socket Name Server Utilities Reference (HTML) (PDF)
Describes Core Foundation socket name functions.
General Reference 2006-10-27
CFError Reference (HTML) (PDF)
Describes the opaque type used to represent error information in Core Foundation.
Events & Other Input Reference 2006-07-12
CFSocket Reference (HTML) (PDF)
Describes the CFSocket opaque type.
General Reference 2006-07-06
CFStream Socket Additions (HTML) (PDF)
Describes the C API for using streams with sockets.
Networking Reference 2006-07-06
Byte-Order Utilities Reference (HTML) (PDF)
Describes Core Foundation byte-order functions.
Data Management Reference 2006-05-23
CFNetwork Reference Collection (HTML) (PDF)
Describes the C APIs for performing a variety network tasks.
Networking Reference 2006-05-23
CFData Reference (HTML) (PDF)
Describes the opaque type for representing an immutable byte buffer.
General Reference 2006-02-07
CFMutableBitVector Reference (HTML) (PDF)
Describes the opaque type for managing a mutable ordered collection of bit values.
General Reference 2006-02-07
CFPlugIn Reference (HTML) (PDF)
Describes the CFPlugIn opaque type.
General Reference 2006-02-07
CFPropertyList Reference (HTML) (PDF)
Describes the CFPropertyList opaque type.
General Reference 2006-02-07
CFRunLoopObserver Reference (HTML) (PDF)
Describes the CFRunLoopObserver opaque type.
General Reference 2006-02-07
CFRunLoopSource Reference (HTML) (PDF)
Describes the CFRunLoopSource opaque type.
General Reference 2006-02-07
CFRunLoopTimer Reference (HTML) (PDF)
Describes the CFRunLoopTimer opaque type.
General Reference 2006-02-07
CFUserNotification Reference (HTML) (PDF)
Describes the CFUserNotification opaque type.
General Reference 2006-02-07
CFXMLNode Reference (HTML) (PDF)
Describes the opaque type for representing an individual XML construct.
General Reference 2006-02-07
CFXMLParser Reference (HTML) (PDF)
Describes the opaque type for finding data in and extracting data from XML documents.
General Reference 2006-02-07