Registering Plug-in Properties

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Registering Plug-in Properties

You can specify additional information about a plug-in in the Properties subkey of each plug-in in the HKEY_CLASSES_ROOT\CLSID key. The following table contains the properties supported by Windows Media Services. You can use the IWMSNamedValues interface to access them.

Subkey Description
Name Contains the name of the plug-in. This is a required key. The maximum length of this key is 250 characters, and the following characters are not valid: & " < > ' ? \.
Author Contains the name of the plug-in author. This key is not required. All default plug-ins that are installed with Windows Media Services create this key.
Copyright Contains copyright information for the plug-in. This key is not required. All default plug-ins that are installed with Windows Media Services create this key.
Description Contains optional information about the plug-in. This key is not required. All default plug-ins that are installed with Windows Media Services create this key.
SubCategory Contains the subcategory used by event notification and authorization plug-ins to indicate what node they should appear under in the user interface. It should contain a string indicating either an Authorize, Logging, or Playlist Transform subcategory.
MMCMoniker Contains a string value corresponding to the CLSID of an MMC snap-in. This is used by Windows Media Administrator to load the MMC administration snap-in for a plug-in.

For plug-ins that use multiple property pages in their administration interface, you must enter a comma-delimited list of CLSIDs. The CLSIDs must be specified in the tab order in which the pages appear.

ASPMoniker Contains a string identifying the physical location of an ASP page. This is used by Windows Media Administrator to load the ASP administration page for a plug-in.
URLPrefix Contains the URL prefix for either a playlist parser plug-in or a data source plug-in. For example the WMS File Data Source plug-in has the following prefix:  file://
URLSuffix Contains the URL suffix of either a playlist parser plug-in or a data source plug-in. For example, the WMS SMIL Playlist Parser plug-in identifies both .wsx and.htm to indicate that the server can parse playlist files that use either file name extension.
InputFormat Contains a CLSID that further identifies the capabilities of selected plug-ins. For example, to indicate that a playlist parser plug-in can be used to create a playlist object from the media files in a directory, you can specify the CLSID that maps to IID_IWMSDirectoryFormat. To indicate that a playlist parser plug-in can only parse a document that contains SMIL 2.0 syntax, you can specify the CLSID that maps to IID_IWMSPlaylistSmilFormat.
UnsupportedLoadTypes Contains a value that identifies unsupported methods for loading authentication or event notification and authorization plug-ins. This can be one of the following values:

0 - The plug-in supports in-process and out-of-process loading.

1 - The plug-in does not support in-process loading.

2 - The plug-in does not support out-of-process loading.

WMSSystemPlugin Identifies a system plug-in. If this value is 1, the plug-in is a system plug-in and cannot be removed.
WMSCriticalSystemPlugin Identifies a critical system plug-in. If this value is 1, the plug-in provides critical functionality to the server and must not be disabled. This property is optional for custom plug-ins.

The following example illustrates how to use a registry file to specify attribute information:

HKCR
{
NoRemove CLSID
{
ForceRemove {0B2A7C4B-AEFE-4503-952F-219240E707D7} = s 'SamplePlugin Class'
   {
      ForceRemove Properties
      {
         val Name = s 'My Sample Plug-in Name'
         val Author = s 'My Corporation'
         val Copyright = s 'My Corporation 2000'
         val SubCategory = s 'Authorize'
         val MMCMoniker = s 'CLSID:{7d44efad-bee9-468b-
                                be91-243a7bba6452}'
         val ASPMoniker = s 'SampleAdmin.asp'
      }
   }
}
}

See Also

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