CBaseControlVideo.OnVideoSizeChange method
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]
Passes an EC_VIDEO_SIZE_CHANGED message to the filter graph manager.
Syntax
virtual HRESULT OnVideoSizeChange();
Parameters
This method has no parameters.
Return value
Returns an HRESULT value that depends on the implementation; can be one of the following values, or other values not listed.
| Return code | Description |
|---|---|
|
Failure. |
|
Out of memory. |
Remarks
A video renderer should call this member function each time the video size is changed; this will typically be called once after initial connection. If the renderer can support dynamic format changes (from 320 x 240 to 160 x 120), it should also call it after each change.
Requirements
| Requirement | Value |
|---|---|
| Header |
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| Library |
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