IDeviceTopology::GetSubunitCount method (devicetopology.h)

The GetSubunitCount method gets the number of subunits in the device topology.

Syntax

HRESULT GetSubunitCount(
  [out] UINT *pCount
);

[out] pCount

Pointer to a UINT variable into which the method writes the subunit count (the number of subunits in the device topology).

If the method succeeds, it returns S_OK. If it fails, possible return codes include, but are not limited to, the values shown in the following table.

Return code	Description
E_POINTER	Pointer pCount is NULL.

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Target Platform	Windows
Header	devicetopology.h