IWMReaderAdvanced2::GetOutputSetting method (wmsdkidl.h)

项目
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 It has been superseded by Source Reader and Sink Writer.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 GetOutputSetting method retrieves a setting for a particular output by name.

Syntax

HRESULT GetOutputSetting(
  [in]      DWORD             dwOutputNum,
  [in]      LPCWSTR           pszName,
  [out]     WMT_ATTR_DATATYPE *pType,
  [out]     BYTE              *pValue,
  [in, out] WORD              *pcbLength
);

Parameters

[in] dwOutputNum

DWORD containing the output number.

[in] pszName

Pointer to a wide-character null-terminated string containing the setting name. For a list of global constants representing setting names, see Output Settings.

[out] pType

Pointer to a member of the WMT_ATTR_DATATYPE enumeration type that specifies the type of the value.

[out] pValue

Pointer to a byte buffer containing the value. Pass NULL to retrieve the length of the buffer required.

[in, out] pcbLength

On input, pointer to a variable containing the length of pValue. On output, the variable contains the number of bytes in pValue.

Return value

If the method succeeds, it returns S_OK. If it fails, it returns an HRESULT error code.

Remarks

You should make two calls to GetOutputSetting. On the first call, pass NULL for pValue. On return, the value pointed to by pcbLength is set to the buffer size required to hold the setting value. Then you can allocate the required amount of memory for the buffer and pass a pointer to it as pValue on the second call.

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)

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