IWMReaderAdvanced4::AddLogParam method (wmsdkidl.h)

Artikel
4/26/2023

[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The AddLogParam method adds a named value to the logging information that the reader object will send to the sever.

Syntax

HRESULT AddLogParam(
  [in] LPCWSTR wszNameSpace,
  [in] LPCWSTR wszName,
  [in] LPCWSTR wszValue
);

Parameters

[in] wszNameSpace

Optional wide-character string that contains the namespace for the log entry. This parameter can be NULL. Namespace names are limited to 1024 wide characters.

[in] wszName

Wide-character string that contains the name of the log entry. Log entry names are limited to 1024 wide characters.

[in] wszValue

Wide-character string that contains the value of the log entry. Log entry values are limited to 1024 wide characters.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.
E_INVALIDARG	One of the parameters exceeded the allowed string length.
E_OUTOFMEMORY	Insufficient memory.

Remarks

The reader object sends logging data to the server in the form of an XML stream. The AddLogParam method enables the client to specify additional logging entries. The wszNameSpace parameter can be used to specify an XML namespace for the new entry. If you do not specify a namespace, the default namespace is used. However, the reader will not override log entries already defined by the server, with the following exception: If the server specifies an empty string ("") for the cs-media-role or cs-media-name entry, you can overwrite these entries. By default, a server running Windows Media Services 9 Series sends an empty string for cs-media-role, and the name of the file for cs-media-name.

To send the logging information to the server, call the SendLogParams method. To retrieve the log entries on the server, you must provide a custom logging plug-in, using the Windows Media Services 9 Series SDK. The default logging plug-in writes just the W3C-compliant log summary, so custom log entries are not included in the log.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only],Windows Media Format 9 Series SDK, or later versions of the SDK
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	wmsdkidl.h (include Wmsdk.h)
Library	Wmvcore.lib; WMStubDRM.lib (if you use DRM)

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