This method returns the current graph version number.

HRESULT QueryVersion(
 LONG* pVersion


  • pVersion
    [out] Pointer to the current graph version number.

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.

Value Description
E_FAIL Failure.
E_POINTER Null pointer argument.
E_INVALIDARG Invalid argument.
E_NOTIMPL Method is not supported.
S_OK or NOERROR Success.


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.


DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.

See Also

IGraphVersion Interface

Last updated on Wednesday, April 13, 2005

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