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IWMSCacheProxy::QuerySpaceForCacheItem

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IWMSCacheProxy::QuerySpaceForCacheItem

The QuerySpaceForCacheItem method is called by the server to retrieve a Boolean value indicating whether the cache has adequate storage for a specific content item.

Syntax

  HRESULT QuerySpaceForCacheItem(
  
  long
  
  lContentSizeHigh
  ,
  
  long
  
  lContentSizeLow
  ,
  
  VARIANT_BOOL*
  
  pvarfSpaceAvail
  
  );

Parameters

lContentSizeHigh

[in] long containing the high DWORD of a 64-bit integer.

lContentSizeLow

[in] long containing the low DWORD of a 64-bit integer.

pvarfSpaceAvail

[out] Pointer to a VARIANT_BOOL that indicates whether the cache has enough available storage.

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

lContentSizeHigh and lContentSizeLow are 32-bit signed long integers that represent the upper and lower DWORDs of a 64-bit integer. Because the values are passed in as signed long integers, they must be cast to unsigned longs before applying them to the 64-bit unsigned integer.

Example Code

Requirements

Header: streamcache.h.

Library: WMSServerTypeLib.dll.

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

See Also

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