IWMOutputMediaProps::GetConnectionName method (wmsdkidl.h)

[アーティクル]
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 It has been superseded by Source Reader and Sink Writer.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 GetConnectionName method retrieves the name of the connection to be used for output.

Syntax

HRESULT GetConnectionName(
  [out]     WCHAR *pwszName,
  [in, out] WORD  *pcchName
);

Parameters

[out] pwszName

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

[in, out] pcchName

On input, a pointer to a variable containing the length of the pwszName array in wide characters. On output, if the method succeeds, it specifies a pointer to the length of the connection 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	The pwszName parameter is NULL.
ASF_E_BUFFERTOOSMALL	The buffer pointed to by pcchName is not large enough for the requested name.

Remarks

The reader creates a default connection name for each output that is simply a string representation of the output number, for example "1", "2", "3" and so on.

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

This connection name is used to match stream numbers to output numbers. All streams in the file are associated with an IWMStreamConfig object whose connection name matches this one (which can be obtained by a call to IWMStreamConfig::GetConnectionName).

Requirements


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)