IWMSCacheProxy.RemoveCacheItem (C#)
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IWMSCacheProxy.RemoveCacheItem (C#)
The RemoveCacheItem method is called by the server to remove a specific cache item.
Syntax
Parameters
bstrOriginUrl
[in] string containing a URL identifying the location of the content to be removed.
pCallback
[in] IWMSCacheProxyCallback object containing the callback function.
varContext
[in] object containing a value defined by the server to identify which call to RemoveAllCacheItems the plug-in is responding to when it calls IWMSCacheProxyCallback.OnRemoveCacheItem. You must pass this value back unaltered.
Return Values
This method does not return a value. To report an error, the plug-in can throw a COMException object to the server. If the plug-in uses the IWMSEventLog object to log error information, it is recommended that it throw NS_E_PLUGIN_ERROR_REPORTED (0xC00D157D). 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 object to send custom error information to the Windows Event Viewer, throwing NS_E_PLUGIN_ERROR_REPORTED stops the server from also logging to the event viewer. For more information about plug-in error information, see Identifying Plug-in Errors.
Example Code
The following example assumes that the cache plug-in makes use of the .NET DataSet collection of DataTable objects. Each DataRow object in the data table represents one IWMSCacheDescriptor object.
using System.Data;
using Microsoft.WindowsMediaServices.Interop;
using System.Runtime.InteropServices;
void IWMSCacheProxy.RemoveCacheItem(
string stringOriginUrl,
IWMSCacheProxyCallback pCallback,
object varContext)
{
try
{
// Call a user-defined function to remove
// an entry from the cache item database.
RemoveEntryFromDatabase(stringOriginUrl,true);
// Call IWMSCacheProxyCallback.OnRemoveCacheItem.
pCallback.OnRemoveCacheItem(0,varContext);
}
catch(Exception e)
{
throw new COMException();
}
return;
}
Requirements
Reference: Add a reference to Microsoft.WindowsMediaServices.
Namespace: Microsoft.WindowsMediaServices.Interop.
Assembly: Microsoft.WindowsMediaServices.dll.
Library: WMSServerTypeLib.dll.
Platform: Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition; Windows Server 2008.
See Also
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