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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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