EC_ACTIVATE
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
A video window is being activated or deactivated.
Parameters
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lParam1
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(BOOL) TRUE if the window is activated, or FALSE if the window is deactivated.
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lParam2
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(IUnknown*) Pointer to the renderer's IBaseFilter interface.
Default Action
The filter graph manager sets the focus, through the IResourceManager interface. It does not send the event notification to the application.
Remarks
A video renderer sends this event whenever its window is activated or deactivated (that is, when it receives a WM_ACTIVATEAPP message). Window activation or deactivation can occur because the window has gained or lost focus, or because the renderer has switched between full-screen mode and windowed mode.
This event enables the filter graph manager to allocate resources that depend on window focus, such as audio devices.
Requirements
| Requirement | Value |
|---|---|
| Header |
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