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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Event Handling

Event handling is primarily supported for COM classes (C++ classes that implement COM objects, typically using ATL classes or the coclass attribute). For more information, see Event Handling in COM.

Event handling is also supported for native C++ classes (C++ classes that do not implement COM objects), however, that support is deprecated and will be removed in a future release. For more information, see Event Handling in Native C++.

Event handling supports single- and multithreaded usage and protects data from simultaneous multithread access. It also allows you to derive subclasses from event source or receiver classes and support extended event sourcing/receiving in the derived class.

Visual C++ includes attributes and keywords for declaring events and event handlers. The event attributes and keywords can be used in CLR programs and in native C++ programs.

Topic

Description

event_source

Creates an event source.

event_receiver

Creates an event receiver (sink).

__event

Declares an event.

__raise

Emphasizes the call site of an event.

__hook

Associates a handler method with an event.

__unhook

Dissociates a handler method from an event.

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