IWMReaderNetworkConfig::GetSupportedProtocolName method (wmsdkidl.h)

發行項
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 It has been superseded by Source Reader and Sink Writer.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 GetSupportedProtocolName method retrieves a protocol name by index.

Syntax

HRESULT GetSupportedProtocolName(
  [in]      DWORD dwProtocolNum,
  [out]     WCHAR *pwszProtocolName,
  [in, out] DWORD *pcchProtocolName
);

Parameters

[in] dwProtocolNum

Specifies protocol name to retrieve, indexed from zero. To get the number of supported protocols, call the IWMReaderNetworkConfig::GetNumProtocolsSupported method.

[out] pwszProtocolName

Pointer to a wide-character null-terminated string containing the protocol name. Pass NULL to retrieve the length of the name.

[in, out] pcchProtocolName

On input, pointer to a DWORD containing the length of the pwszProtocolName, in characters. On output, pointer to the length of the protocol name, including the terminating null character.

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	NULL or invalid argument passed in.

Remarks

You should make two calls to GetSupportedProtocolName. On the first call, pass NULL for pwszProtocoName. On return, the value pointed to by pcchProtocolName is set to the number of wide characters, including the terminating null, required to hold the protocol name. Then you can allocate the required amount of memory for the string and pass a pointer to it as pwszProtocolName on the second call.

Use this method along with GetNumProtocolsSupported to iterate through the network protocols supported by the reader object.

This method only returns a list of protocols that are used to receive content from Windows Media servers. Protocols that are only used for retrieving content from local sources, or non-Windows Media servers (such as Web servers) are not included in this list.

Note The HTTPS support works only when downloading content from a Web server (because the player is using WININET). Streaming protocols supported are HTTP, RTSP, MMS, and, for multicasting, ASFM (by opening an ASF file with an .nsc extension). Download support includes HTTP, HTTPS, and FTP.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only],Windows Media Format 7 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)

共用方式為