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IGraphVersion::QueryVersion

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Microsoft DirectShow 9.0

IGraphVersion::QueryVersion

The QueryVersion method retrieves the current graph version number.

Syntax

  HRESULT QueryVersion(
  LONG *pVersion
);

Parameters

pVersion

Pointer to the current graph version.

Return Values

Returns an HRESULT value that depends on the implementation. HRESULT can be one of the following standard constants, or other values not listed.

Return code Description
E_FAIL Failure.
E_POINTER Null pointer argument.
E_INVALIDARG Invalid argument.
E_NOTIMPL Method isn't supported.
S_OK or NOERROR Success.

Remarks

The version number is incremented every time there is a change in the set of filters in the graph or in their connections. If the version number has changed since the last enumeration, the graph must be re-enumerated.

Requirements

Header: Declared in Strmif.h; include Dshow.h.

Library: Use Strmiids.lib.

See Also