IWMLicenseBackup::BackupLicenses method (wmsdkidl.h)

Статья
4/26/2023

[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 It has been superseded by Source Reader and Sink Writer.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.]

[BackupLicenses is available for use in the operating systems specified in the Requirements section. It may be altered or unavailable in subsequent versions. Instead, use Microsoft PlayReady. ]

The BackupLicenses method saves copies of the licenses.

Syntax

HRESULT BackupLicenses(
  [in] DWORD             dwFlags,
  [in] IWMStatusCallback *pCallback
);

Parameters

[in] dwFlags

DWORD containing the flags.

Flag	Description
WM_BACKUP_OVERWRITE	Indicates that any existing backup file should be overwritten. If this is not set, and a backup file exists, the NS_E_DRM_BACKUP_EXISTS error code is returned.

[in] pCallback

Pointer to an object that implements the IWMStatusCallback interface.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.
E_INVALIDARG	The pCallback parameter is NULL.
E_OUTOFMEMORY	Not enough memory available to perform the task.

Remarks

For more information on how to specify the location of the backup file (there are predefined properties for the backup path and restore path for this purpose), see IWMBackupRestoreProps Interface.

This method operates asynchronously, and an IWMStatusCallback object can be used to track progress.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only],Windows Media Format 7 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)

Поделиться через