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EC_ACTIVATE

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An audio or video renderer is losing or gaining activation. The audio or video renderer sends this event notification.

Parameters

  • lParam1
    Set to 1 if activation gained, or 0 if lost.
  • lParam2
    Pointer to the IBaseFilter interface that is sending the event notification.

Remarks

This event notification is not sent to the application. This notification is used for sound-follows-focus and full-screen switching. To interact in full-screen protocols, a video renderer should send an EC_ACTIVATE notification whenever its window is either activated or deactivated. In other words, an EC_ACTIVATE notification should be sent for each WM_ACTIVATEAPP message received by a renderer.

For information on how to use this event code, see CBaseFilter::NotifyEvent.

Requirements

DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
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Last updated on Wednesday, April 13, 2005

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