EC_ACTIVATE
| Microsoft DirectShow 9.0 |
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