EC_ACTIVATE

EC_ACTIVATE

A video window is being activated or deactivated.

Parameters

lParam1

(BOOL) TRUE if the window is activated, or FALSE if the window is deactivated.

lParam2

(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

  Header: Dshow.h.

See Also

• Event Notification Codes