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The GetSubunit method gets the subunit that is specified by a subunit number.
Syntax
HRESULT GetSubunit(
[in] UINT nIndex,
[out] ISubunit **ppSubunit
);
Parameters
[in] nIndex
The subunit number. If a device topology contains n subunits, the subunits are numbered from 0 to n– 1. To get the number of subunits in the device topology, call the IDeviceTopology::GetSubunitCount method.
[out] ppSubunit
Pointer to a pointer variable into which the method writes the address of the ISubunit interface of the subunit object. Through this method, the caller obtains a counted reference to the interface. The caller is responsible for releasing the interface, when it is no longer needed, by calling the interface's Release method. If the GetSubunit call fails, *ppSubunit is NULL.
Return value
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 |
|---|---|
|
Parameter nIndex is out of range. |
|
Pointer ppSubunit is NULL. |
Requirements
| 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 |