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IWMSDataContainerVersion::Compare

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IWMSDataContainerVersion::Compare

The Compare method compares two IWMSDataContainerVersion interfaces to determine whether they are equal.

Syntax

  HRESULT Compare(
  IWMSDataContainerVersion*  pVersion,
  VARIANT_BOOL*  pvfEqual
);

Parameters

pVersion

[in] Pointer to the IWMSDataContainerVersion interface to which the current interface must be compared.

pvfEqual

[out] Pointer to a VARIANT_BOOL containing the result of the comparison.

Return Values

If the method succeeds, the plug-in must return S_OK. To report an error, the plug-in can return any HRESULT other than S_OK. If the plug-in uses the IWMSEventLog interface to log error information directly to the Windows Event Viewer, it is recommended that it return NS_E_PLUGIN_ERROR_REPORTED. Typically, the server attempts to make plug-in error information available to the server object model, the Windows Event Viewer, and the troubleshooting list in the details pane of the Windows Media Services MMC. However, if the plug-in uses the IWMSEventLog interface to send custom error information to the Windows Event Viewer, returning NS_E_PLUGIN_ERROR_REPORTED stops the server from also logging to the event viewer. For more information about retrieving plug-in error information, see Identifying Plug-in Errors.

Remarks

If the IWMSDataContainerVersion interface for the cache server equals the IWMSDataContainerVersion interface for the origin server, the content on the cache server is current.

Example Code

IWMSDataContainerVersion *pNewVersion = NULL;
IWMSDataContainerVersion *pOldVersion = NULL; 
VARIANT_BOOL vfEqual;

// Both pContentInfo and m_pContentInfo are pointers to cache 
// content information contexts.
hr = pContentInfo->GetAndQueryIUnknownValue(
        WMS_CACHE_CONTENT_INFORMATION_DATA_CONTAINER_VERSION,
        WMS_CACHE_CONTENT_INFORMATION_DATA_CONTAINER_VERSION_ID,
        IID_IWMSDataContainerVersion,
        (IUnknown **) &pNewVersion,
        0 );

hr = m_pContentInfo->GetAndQueryIUnknownValue(
        WMS_CACHE_CONTENT_INFORMATION_DATA_CONTAINER_VERSION,
        WMS_CACHE_CONTENT_INFORMATION_DATA_CONTAINER_VERSION_ID,
        IID_IWMSDataContainerVersion,
        (IUnknown **) &pOldVersion,
        0 );

// Compare the two IWMSDataContainerVersion interfaces.
hr = pOldVersion->Compare( pNewVersion, &vfEqual );

Requirements

Header: datacontainerversion.h.

Library: WMSServerTypeLib.dll.

Platform: Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition; Windows Server 2008.

See Also

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