IDDrawExclModeVideoCallback::OnUpdateSize 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 OnUpdateSize method informs the application that the size of the video rectangle is about to change.
Syntax
HRESULT OnUpdateSize(
[in] DWORD dwWidth,
[in] DWORD dwHeight,
[in] DWORD dwARWidth,
[in] DWORD dwARHeight
);
Parameters
[in] dwWidth
The new width, in pixels, of the video stream.
[in] dwHeight
The new height, in pixels, of the video stream.
[in] dwARWidth
The new horizontal value of the aspect ratio.
[in] dwARHeight
The new vertical value of the aspect ratio.
Return value
Returns an HRESULT value.
Remarks
This method is called when the size of the rectangle in the video stream changes, for example from 704x480 to 640x480.
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 |