IConnector::GetDeviceIdConnectedTo
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IConnector::GetDeviceIdConnectedTo
The GetDeviceIdConnectedTo method gets the device identifier of the audio device, if any, that this connector is connected to.
HRESULT GetDeviceIdConnectedTo( LPWSTR *ppwstrDeviceId );
Parameters
ppwstrDeviceId
[out] Pointer to a string pointer into which the method writes the address of a null-terminated, wide-character string that contains the device identifier of the connected device. The method allocates the storage for the string. The caller is responsible for freeing the storage, when it is no longer needed, by calling the CoTaskMemFree function. If the GetDeviceIdConnectedTo call fails, *ppwstrDeviceId is NULL. For information about CoTaskMemFree, see the Windows SDK documentation.
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 |
| E_POINTER | Pointer ppwstrDeviceId is NULL. |
| E_NOTFOUND | This connector is not connected, or the other side of the connection is not another device topology (for example, a Software_IO connection). |
| E_MEMORY | Out of memory. |
Remarks
The device identifier obtained from this method can be used as an input parameter to the IMMDeviceEnumerator::GetDevice method.
This method is functionally equivalent to, but more efficient than, the following series of method calls:
- Call the IConnector::GetConnectedTo method to obtain the IConnector interface of the "to" connector.
- Call the IConnector::QueryInterface method (with parameter iid set to REFIID IID_IPart) to obtain the IPart interface of the "to" connector.
- Call the IPart::GetTopologyObject method to obtain the IDeviceTopology interface of the "to" device (the device that contains the "to" connector).
- Call the IDeviceTopology::GetDeviceId method to obtain the device ID of the "to" device.
Requirements
Client: Windows Vista
Header: Include Devicetopology.h.
See Also
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