# IUSBController Interface Reference

List of all members.

## Public Member Functions
void | createDeviceFilter (in wstring name,[retval] out IUSBDeviceFilter filter)
| Creates a new USB device filter.
void | insertDeviceFilter (in unsigned long position, in IUSBDeviceFilter filter)
| Inserts the given USB device to the specified position in the list of filters.
void | removeDeviceFilter (in unsigned long position,[retval] out IUSBDeviceFilter filter)
| Removes a USB device filter from the specified position in the list of filters.
## Public Attributes
attribute boolean | enabled
| Flag whether the USB controller is present in the guest system.
attribute boolean | enabledEhci
| Flag whether the USB EHCI controller is present in the guest system.
readonly attribute boolean | proxyAvailable
| Flag whether there is an USB proxy available.
readonly attribute unsigned short | USBStandard
| USB standard version which the controller implements.
readonly attribute IUSBDeviceFilter[] | deviceFilters
| List of USB device filters associated with the machine.

## Member Function Documentation

void IUSBController::createDeviceFilter | ( | in wstring | name,
|  | [retval] out IUSBDeviceFilter | filter |
| ) |  |  |

Creates a new USB device filter.

All attributes except the filter name are set to empty (any match), active is `false` (the filter is not active).

The created filter can then be added to the list of filters using insertDeviceFilter.

Parameters:

  | name | Filter name. See IUSBDeviceFilter::name for more info.
  | filter | Created filter object.

Expected result codes:

  VBOX_E_INVALID_VM_STATE | The virtual machine is not mutable.

See also:
  deviceFilters

void IUSBController::insertDeviceFilter | ( | in unsigned long | position,
|  | in IUSBDeviceFilter | filter |
| ) |  |  |

Inserts the given USB device to the specified position in the list of filters.

Positions are numbered starting from `0`. If the specified position is equal to or greater than the number of elements in the list, the filter is added to the end of the collection.

Parameters:

  | position | Position to insert the filter to.
  | filter | USB device filter to insert.

Expected result codes:

  VBOX_E_INVALID_VM_STATE | Virtual machine is not mutable.
  E_INVALIDARG | USB device filter not created within this VirtualBox instance.
  VBOX_E_INVALID_OBJECT_STATE | USB device filter already in list.

Note:
  Duplicates are not allowed, so an attempt to insert a filter that is already in the collection, will return an error.

See also:
  deviceFilters

void IUSBController::removeDeviceFilter | ( | in unsigned long | position,
|  | [retval] out IUSBDeviceFilter | filter |
| ) |  |  |

Removes a USB device filter from the specified position in the list of filters.

Positions are numbered starting from `0`. Specifying a position equal to or greater than the number of elements in the list will produce an error.

Parameters:

  | position | Position to remove the filter from.
  | filter | Removed USB device filter.

Expected result codes:

  VBOX_E_INVALID_VM_STATE | Virtual machine is not mutable.
  E_INVALIDARG | USB device filter list empty or invalid position.

See also:
  deviceFilters

## Member Data Documentation

attribute boolean IUSBController::enabled

Flag whether the USB controller is present in the guest system.

If disabled, the virtual guest hardware will not contain any USB controller. Can only be changed when the VM is powered off.

attribute boolean IUSBController::enabledEhci

Flag whether the USB EHCI controller is present in the guest system.

If disabled, the virtual guest hardware will not contain a USB EHCI controller. Can only be changed when the VM is powered off.

readonly attribute boolean IUSBController::proxyAvailable

Flag whether there is an USB proxy available.

readonly attribute unsigned short IUSBController::USBStandard

USB standard version which the controller implements.

This is a BCD which means that the major version is in the high byte and minor version is in the low byte.

readonly attribute IUSBDeviceFilter [] IUSBController::deviceFilters

List of USB device filters associated with the machine.

If the machine is currently running, these filters are activated every time a new (supported) USB device is attached to the host computer that was not ignored by global filters (IHost::USBDeviceFilters).

These filters are also activated when the machine is powered up. They are run against a list of all currently available USB devices (in states USBDeviceState_Available, USBDeviceState_Busy, USBDeviceState_Held) that were not previously ignored by global filters.

If at least one filter matches the USB device in question, this device is automatically captured (attached to) the virtual USB controller of this machine.

See also:
  IUSBDeviceFilter, IUSBController