IResourceManager::ReleaseFocus method (strmif.h)
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]
The ReleaseFocus method sets the focus object to NULL in the resource manager if the current focus object is the one specified in this method.
Syntax
HRESULT ReleaseFocus(
[in] IUnknown *pFocusObject
);
Parameters
[in] pFocusObject
Pointer to the focus object.
Return value
Returns an HRESULT value that depends on the implementation. HRESULT can be one of the following standard constants, or other values not listed.
| Return code | Description |
|---|---|
|
Failure. |
|
NULL pointer argument. |
|
Invalid argument. |
|
Method isn't supported. |
|
Success. |
Remarks
Use this method when the object of focus is about to be destroyed to ensure that the focus is not still being referenced.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | strmif.h (include Dshow.h) |
| Library | Strmiids.lib |