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For another example, Mac OS X on the PowerPC had the ability to run Mac OS 9 and earlier application software through Classic—but this did not make Mac OS X a binary compatible OS with Mac OS 9. Instead, the Classic environment was actually running Mac OS 9.1 in a virtual machine, running as a normal process inside of Mac OS X. [1] [2]
Cocoa is Apple's native object-oriented application programming interface (API) for its desktop operating system macOS.. Cocoa consists of the Foundation Kit, Application Kit, and Core Data frameworks, as included by the Cocoa.h header file, and the libraries and frameworks included by those, such as the C standard library and the Objective-C runtime.
The event loop almost always operates asynchronously with the message originator. When the event loop forms the central control flow construct of a program, as it often does, it may be termed the main loop or main event loop. This title is appropriate, because such an event loop is at the highest level of control within the program.
A task in Grand Central Dispatch can be used either to create a work item that is placed in a queue or assign it to an event source. If a task is assigned to an event source, then a work unit is made from the block or function when the event triggers, and the work unit is placed in an appropriate queue.
This API is a part of .NET Framework 3.0. A Windows Forms application is an event-driven application supported by Microsoft's .NET Framework.Unlike a batch program, it spends most of its time simply waiting for the user to do something, such as fill in a text box or click a button.
An event requires an accompanied event handler that is made from a special delegate that in a platform specific library like in Windows Presentation Foundation and Windows Forms usually takes two parameters: sender and the event arguments. The type of the event argument-object derive from the EventArgs class that is a part of the CLI base library.
Apple events form the basis of the Mac OS scripting system, the Open Scripting Architecture (the primary language of such being AppleScript). The starting point is a dynamically-typed, extensible descriptor format called an AEDesc , which is just an OSType code specifying the data type, together with a block of type-dependent data.
Event-driven programming is the dominant paradigm used in graphical user interfaces applications and network servers. In an event-driven application, there is generally an event loop that listens for events and then triggers a callback function when one of those events is detected.