IAVIStream::FindSample method (vfw.h)
The FindSample method obtains the position in a stream of a key frame or a nonempty frame. Called when an application uses the AVIStreamFindSample function.
Syntax
LONG FindSample(
LONG lPos,
LONG lFlags
);
Parameters
lPos
Position of the sample or frame.
lFlags
Applicable flags. The following values are defined.
| Value | Description |
|---|---|
| FIND_ANY | Searches for a nonempty frame. |
| FIND_FORMAT | Searches for a format change. |
| FIND_KEY | Searches for a key frame. |
| FIND_NEXT | Searches forward through a stream, beginning with the current frame. |
| FIND_PREV | Searches backward through a stream, beginning with the current frame. |
The FIND_ANY, FIND_KEY, and FIND_FORMAT flags are mutually exclusive, as are the FIND_NEXT and FIND_PREV flags. You must specify one value from each group.
Return value
Returns the location of the key frame corresponding to the frame specified by the application.
Remarks
If key frames are not significant in your custom format, return the position specified for lPos.
For handlers written in C++, FindSample has the following syntax:
LONG FindSample(LONG lPos, LONG lFlags)
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 | vfw.h |
| Library | Vfw32.lib |