IMDSPObjectInfo::SetPlayOffset
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The SetPlayOffset method sets the play offset of the object, in the units pertinent to the object. This specifies the starting point for the next invocation of IMDSPDeviceControl::Play.
Syntax
HRESULT SetPlayOffset(DWORDdwOffset);
Parameters
dwOffset
[in] DWORD containing the play offset to set for the object, in units pertinent to the object.
Return Values
The method returns an HRESULT. All the interface methods in Windows Media Device Manager can return any of the following classes of error codes:
- Standard COM error codes
- Windows error codes converted to HRESULT values
- Windows Media Device Manager error codes
For an extenstive list of possible error codes, see Error Codes.
Possible values include, but are not limited to, those in the following table.
| Return code | Description |
| S_OK | The method succeeded. |
| WMDM_E_NOTSUPPORTED | This device does not support setting play lengths. |
| E_INVALIDTYPE | The object that this interface is associated with is not a valid playable file or a folder or file system containing playable files. |
| E_FAIL | An unspecified error occurred. |
Remarks
If the value passed is greater than the total length of the object minus the current play length, it is clipped to the length of the object minus the play length.
For playable files, the value is specified in milliseconds. The play offset position value does not change when the user starts playing a file on the media device or when an application invokes the IMDSPDeviceControl::Play method.
For folders or file systems containing playable files, the value indicates the first track that is played when an application invokes the IMDSPDeviceControl::Play method.
Requirements
Header: Defined in mswmdm.h.
Library: mssachlp.lib
See Also