IWMSyncReader::SetRange method (wmsdkidl.h)
[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The SetRange method enables you to specify a start time and duration for playback by the synchronous reader.
Syntax
HRESULT SetRange(
[in] QWORD cnsStartTime,
[in] LONGLONG cnsDuration
);
Parameters
[in] cnsStartTime
Offset into the file at which to start playback. This value is measured in 100-nanosecond units.
[in] cnsDuration
Duration in 100-nanosecond units, or zero to continue playback to the end of the file.
Return value
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Return code | Description |
|---|---|
|
The method succeeded. |
|
The cnsDuration parameter is negative. |
|
The method is unable to allocate memory for an internal object. |
|
No file is loaded in the synchronous reader. |
Remarks
This method specifies a range for the whole file only. You cannot specify a range for an individual stream.
You can call SetRange at any time after a file has been loaded.
The start time you specify might not be the presentation time of the first sample received. The synchronous delivers video samples starting with the key frame before the specified time.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only],Windows Media Format 9 Series SDK, or later versions of the SDK |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | wmsdkidl.h (include Wmsdk.h) |
| Library | Wmvcore.lib; WMStubDRM.lib (if you use DRM) |