Share via

IWMSCacheProxyCallback::OnAddCacheItem

  • Article

banner art

Previous Next

IWMSCacheProxyCallback::OnAddCacheItem

The OnAddCacheItem method is called by the cache plug-in to respond when the server calls IWMSCacheProxy::AddCacheItem. The AddCacheItem method prestuffs a cache.

Syntax

  HRESULT OnAddCacheItem(
  
  HRESULT
  
  hr
  ,
  
  IWMSCacheItemDescriptor*
  
  pCacheDescriptor
  ,
  
  VARIANT
  
  varContext
  
  );

Parameters

hr

[in] HRESULT indicating whether the call to IWMSCacheProxy::AddCacheItem was successful.

pCacheDescriptor

[in] Pointer to an IWMSCacheItemDescriptor interface containing the size, version number, and expiration date of the cache item.

varContext

[in] VARIANT containing a value defined by the server to identify which call to IWMSCacheProxy::AddCacheItem the plug-in is responding to when it calls OnAddCacheItem. The plug-in must pass this value back unaltered.

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.

Example Code

      if (FAILED(hr)) goto EXIT;











































    if (FAILED(hr)) goto EXIT;






EXIT:
    // TODO: Release temporary objects.

Requirements

Header: streamcache.h.

Library: WMSServerTypeLib.dll.

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

See Also

Previous Next