IAMNetShowPreroll::put_Preroll method (qnetwork.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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 put_Preroll method specifies whether the filter should start prerolling.
Syntax
HRESULT put_Preroll(
VARIANT_BOOL fPreroll
);
Parameters
fPreroll
Specifies one of the following values:
| Value | Description |
|---|---|
| VARIANT_TRUE | Begin prerolling. |
| VARIANT_FALSE | Stop prerolling. |
Return value
If the method succeeds, it returns S_OK. If it fails, it returns an HRESULT error code.
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 | qnetwork.h |