IUnregisterPhysicalConnection::UnregisterPhysicalConnectionToExternal method (portcls.h)
The UnregisterPhysicalConnectionToExternal method deletes the registration of a physical connection that was registered by a previous call to PcRegisterPhysicalConnectionToExternal.
Syntax
NTSTATUS UnregisterPhysicalConnectionToExternal(
[in] PDEVICE_OBJECT DeviceObject,
[in] PUNKNOWN FromUnknown,
[in] ULONG FromPin,
[in] PUNICODE_STRING ToString,
[in] ULONG ToPin
);
Parameters
[in] DeviceObject
Pointer to the device object for the adapter device. This parameter must point to a system structure of type DEVICE_OBJECT.
[in] FromUnknown
Pointer to the IPort interface of a port driver object. The port driver object that is associated with FromUnknown is bound to the subdevice that supplies the connection's data source pin.
[in] FromPin
Specifies a pin ID. This parameter identifies the data source (output) pin on the filter that is associated with the FromUnknown interface.
[in] ToString
Pointer to a null-terminated Unicode string that contains the name of the external filter that supplies the connection's data sink pin.
[in] ToPin
Specifies a pin ID. This parameter identifies the data sink (input) pin on the external filter that is named by the ToString parameter.
Return value
UnregisterPhysicalConnectionToExternal returns STATUS_SUCCESS if the call was successful. Otherwise, it returns an appropriate error code.
Remarks
For more information, see Dynamic Audio Subdevices.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Universal |
| Header | portcls.h (include Portcls.h) |
| IRQL | PASSIVE_LEVEL |