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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.


The ON_EVENT_REFLECT macro, when used in the event sink map of an OLE control's wrapper class, receives events fired by the control before they are handled by the control's container.

ON_EVENT_REFLECT(theClass, dispid, pfnHandler, vtsParams )



The class to which this event sink map belongs.


The dispatch ID of the event fired by the control.


Pointer to a member function that handles the event. This function should have a BOOL return type and parameter types that match the event's parameters (see vtsParams). The function should return TRUE to indicate the event was handled; otherwise FALSE.


A sequence of VTS_ constants that specifies the types of the parameters for the event. These are the same constants that are used in dispatch map entries such as DISP_FUNCTION.

The vtsParams argument is a space-separated list of values from the VTS_ constants.

One or more of these values separated by spaces (not commas) specifies the function's parameter list. For example:


specifies a list containing a short integer followed by a BOOL.

For a list of the VTS_ constants, see EVENT_CUSTOM.

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