IKsTopologyInfo::get_NumCategories method (vidcap.h)

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The get_NumCategories method returns the number of categories for this filter.

Syntax

HRESULT get_NumCategories(
  [out] DWORD *pdwNumCategories
);

Parameters

[out] pdwNumCategories

Receives the number of categories.

Return value

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

Requirements

See also

Error and Success Codes

IKsTopologyInfo Interface