---
title: IOUSBHost Constants
framework: IOUSBHost
role: collectionGroup
role_heading: API Collection
path: iousbhost/iousbhost-constants
---

# IOUSBHost Constants

## Topics

### Constants

- [IOUSBHostCIControllerStateActive](iousbhost/iousbhostcicontrollerstateactive.md)
- [IOUSBHostCIControllerStateOff](iousbhost/iousbhostcicontrollerstateoff.md)
- [IOUSBHostCIControllerStatePaused](iousbhost/iousbhostcicontrollerstatepaused.md)
- [IOUSBHostCIDeviceSpeedFull](iousbhost/iousbhostcidevicespeedfull.md)
- [IOUSBHostCIDeviceSpeedHigh](iousbhost/iousbhostcidevicespeedhigh.md)
- [IOUSBHostCIDeviceSpeedLow](iousbhost/iousbhostcidevicespeedlow.md)
- [IOUSBHostCIDeviceSpeedNone](iousbhost/iousbhostcidevicespeednone.md)
- [IOUSBHostCIDeviceSpeedSuper](iousbhost/iousbhostcidevicespeedsuper.md)
- [IOUSBHostCIDeviceSpeedSuperPlus](iousbhost/iousbhostcidevicespeedsuperplus.md)
- [IOUSBHostCIDeviceSpeedSuperPlusBy2](iousbhost/iousbhostcidevicespeedsuperplusby2.md)
- [IOUSBHostCIDeviceStateActive](iousbhost/iousbhostcidevicestateactive.md)
- [IOUSBHostCIDeviceStateDestroyed](iousbhost/iousbhostcidevicestatedestroyed.md)
- [IOUSBHostCIDeviceStatePaused](iousbhost/iousbhostcidevicestatepaused.md)
- [IOUSBHostCIEndpointStateActive](iousbhost/iousbhostciendpointstateactive.md)
- [IOUSBHostCIEndpointStateDestroyed](iousbhost/iousbhostciendpointstatedestroyed.md)
- [IOUSBHostCIEndpointStateHalted](iousbhost/iousbhostciendpointstatehalted.md)
- [IOUSBHostCIEndpointStatePaused](iousbhost/iousbhostciendpointstatepaused.md)
- [IOUSBHostCIExceptionTypeCapabilitiesInvalid](iousbhost/iousbhostciexceptiontypecapabilitiesinvalid.md)
- [IOUSBHostCIExceptionTypeCommandFailure](iousbhost/iousbhostciexceptiontypecommandfailure.md)
- [IOUSBHostCIExceptionTypeCommandReadCollision](iousbhost/iousbhostciexceptiontypecommandreadcollision.md)
- [IOUSBHostCIExceptionTypeCommandTimeout](iousbhost/iousbhostciexceptiontypecommandtimeout.md)
- [IOUSBHostCIExceptionTypeCommandWriteFailed](iousbhost/iousbhostciexceptiontypecommandwritefailed.md)
- [IOUSBHostCIExceptionTypeDoorbellOverflow](iousbhost/iousbhostciexceptiontypedoorbelloverflow.md)
- [IOUSBHostCIExceptionTypeDoorbellReadCollision](iousbhost/iousbhostciexceptiontypedoorbellreadcollision.md)
- [IOUSBHostCIExceptionTypeFrameUpdateError](iousbhost/iousbhostciexceptiontypeframeupdateerror.md)
- [IOUSBHostCIExceptionTypeInterruptInvalid](iousbhost/iousbhostciexceptiontypeinterruptinvalid.md)
- [IOUSBHostCIExceptionTypeInterruptOverflow](iousbhost/iousbhostciexceptiontypeinterruptoverflow.md)
- [IOUSBHostCIExceptionTypeProtocolError](iousbhost/iousbhostciexceptiontypeprotocolerror.md)
- [IOUSBHostCIExceptionTypeTerminated](iousbhost/iousbhostciexceptiontypeterminated.md)
- [IOUSBHostCIExceptionTypeUnknown](iousbhost/iousbhostciexceptiontypeunknown.md)
- [IOUSBHostCILinkStateCompliance](iousbhost/iousbhostcilinkstatecompliance.md)
- [IOUSBHostCILinkStateDisabled](iousbhost/iousbhostcilinkstatedisabled.md)
- [IOUSBHostCILinkStateInactive](iousbhost/iousbhostcilinkstateinactive.md)
- [IOUSBHostCILinkStatePolling](iousbhost/iousbhostcilinkstatepolling.md)
- [IOUSBHostCILinkStateRecovery](iousbhost/iousbhostcilinkstaterecovery.md)
- [IOUSBHostCILinkStateReset](iousbhost/iousbhostcilinkstatereset.md)
- [IOUSBHostCILinkStateResume](iousbhost/iousbhostcilinkstateresume.md)
- [IOUSBHostCILinkStateRxDetect](iousbhost/iousbhostcilinkstaterxdetect.md)
- [IOUSBHostCILinkStateTest](iousbhost/iousbhostcilinkstatetest.md)
- [IOUSBHostCILinkStateU0](iousbhost/iousbhostcilinkstateu0.md)
- [IOUSBHostCILinkStateU1](iousbhost/iousbhostcilinkstateu1.md)
- [IOUSBHostCILinkStateU2](iousbhost/iousbhostcilinkstateu2.md)
- [IOUSBHostCILinkStateU3](iousbhost/iousbhostcilinkstateu3.md)
- [IOUSBHostCIMessageStatusBadArgument](iousbhost/iousbhostcimessagestatusbadargument.md)
- [IOUSBHostCIMessageStatusEndpointStopped](iousbhost/iousbhostcimessagestatusendpointstopped.md)
- [IOUSBHostCIMessageStatusError](iousbhost/iousbhostcimessagestatuserror.md)
- [IOUSBHostCIMessageStatusMissedServiceError](iousbhost/iousbhostcimessagestatusmissedserviceerror.md)
- [IOUSBHostCIMessageStatusNoResources](iousbhost/iousbhostcimessagestatusnoresources.md)
- [IOUSBHostCIMessageStatusNotPermitted](iousbhost/iousbhostcimessagestatusnotpermitted.md)
- [IOUSBHostCIMessageStatusOffline](iousbhost/iousbhostcimessagestatusoffline.md)
- [IOUSBHostCIMessageStatusOverrunError](iousbhost/iousbhostcimessagestatusoverrunerror.md)
- [IOUSBHostCIMessageStatusProtocolError](iousbhost/iousbhostcimessagestatusprotocolerror.md)
- [IOUSBHostCIMessageStatusReserved](iousbhost/iousbhostcimessagestatusreserved.md)
- [IOUSBHostCIMessageStatusStallError](iousbhost/iousbhostcimessagestatusstallerror.md)
- [IOUSBHostCIMessageStatusSuccess](iousbhost/iousbhostcimessagestatussuccess.md)
- [IOUSBHostCIMessageStatusTimeout](iousbhost/iousbhostcimessagestatustimeout.md)
- [IOUSBHostCIMessageStatusTransactionError](iousbhost/iousbhostcimessagestatustransactionerror.md)
- [IOUSBHostCIMessageTypeCommandMax](iousbhost/iousbhostcimessagetypecommandmax.md)
- [IOUSBHostCIMessageTypeCommandMin](iousbhost/iousbhostcimessagetypecommandmin.md)
- [IOUSBHostCIMessageTypeControllerCapabilities](iousbhost/iousbhostcimessagetypecontrollercapabilities.md)
- [IOUSBHostCIMessageTypeControllerFrameNumber](iousbhost/iousbhostcimessagetypecontrollerframenumber.md)
- [IOUSBHostCIMessageTypeControllerPause](iousbhost/iousbhostcimessagetypecontrollerpause.md)
- [IOUSBHostCIMessageTypeControllerPowerOff](iousbhost/iousbhostcimessagetypecontrollerpoweroff.md)
- [IOUSBHostCIMessageTypeControllerPowerOn](iousbhost/iousbhostcimessagetypecontrollerpoweron.md)
- [IOUSBHostCIMessageTypeControllerStart](iousbhost/iousbhostcimessagetypecontrollerstart.md)
- [IOUSBHostCIMessageTypeDeviceCreate](iousbhost/iousbhostcimessagetypedevicecreate.md)
- [IOUSBHostCIMessageTypeDeviceDestroy](iousbhost/iousbhostcimessagetypedevicedestroy.md)
- [IOUSBHostCIMessageTypeDevicePause](iousbhost/iousbhostcimessagetypedevicepause.md)
- [IOUSBHostCIMessageTypeDeviceStart](iousbhost/iousbhostcimessagetypedevicestart.md)
- [IOUSBHostCIMessageTypeDeviceUpdate](iousbhost/iousbhostcimessagetypedeviceupdate.md)
- [IOUSBHostCIMessageTypeEndpointCreate](iousbhost/iousbhostcimessagetypeendpointcreate.md)
- [IOUSBHostCIMessageTypeEndpointDestroy](iousbhost/iousbhostcimessagetypeendpointdestroy.md)
- [IOUSBHostCIMessageTypeEndpointPause](iousbhost/iousbhostcimessagetypeendpointpause.md)
- [IOUSBHostCIMessageTypeEndpointReset](iousbhost/iousbhostcimessagetypeendpointreset.md)
- [IOUSBHostCIMessageTypeEndpointSetNextTransfer](iousbhost/iousbhostcimessagetypeendpointsetnexttransfer.md)
- [IOUSBHostCIMessageTypeEndpointUpdate](iousbhost/iousbhostcimessagetypeendpointupdate.md)
- [IOUSBHostCIMessageTypeEndpoint_reserved_](iousbhost/iousbhostcimessagetypeendpoint_reserved_.md)
- [IOUSBHostCIMessageTypeFrameNumberUpdate](iousbhost/iousbhostcimessagetypeframenumberupdate.md)
- [IOUSBHostCIMessageTypeFrameTimestampUpdate](iousbhost/iousbhostcimessagetypeframetimestampupdate.md)
- [IOUSBHostCIMessageTypeIsochronousTransfer](iousbhost/iousbhostcimessagetypeisochronoustransfer.md)
- [IOUSBHostCIMessageTypeLink](iousbhost/iousbhostcimessagetypelink.md)
- [IOUSBHostCIMessageTypeNormalTransfer](iousbhost/iousbhostcimessagetypenormaltransfer.md)
- [IOUSBHostCIMessageTypePortCapabilities](iousbhost/iousbhostcimessagetypeportcapabilities.md)
- [IOUSBHostCIMessageTypePortDisable](iousbhost/iousbhostcimessagetypeportdisable.md)
- [IOUSBHostCIMessageTypePortEvent](iousbhost/iousbhostcimessagetypeportevent.md)
- [IOUSBHostCIMessageTypePortPowerOff](iousbhost/iousbhostcimessagetypeportpoweroff.md)
- [IOUSBHostCIMessageTypePortPowerOn](iousbhost/iousbhostcimessagetypeportpoweron.md)
- [IOUSBHostCIMessageTypePortReset](iousbhost/iousbhostcimessagetypeportreset.md)
- [IOUSBHostCIMessageTypePortResume](iousbhost/iousbhostcimessagetypeportresume.md)
- [IOUSBHostCIMessageTypePortStatus](iousbhost/iousbhostcimessagetypeportstatus.md)
- [IOUSBHostCIMessageTypePortSuspend](iousbhost/iousbhostcimessagetypeportsuspend.md)
- [IOUSBHostCIMessageTypeSetupTransfer](iousbhost/iousbhostcimessagetypesetuptransfer.md)
- [IOUSBHostCIMessageTypeStatusTransfer](iousbhost/iousbhostcimessagetypestatustransfer.md)
- [IOUSBHostCIMessageTypeTransferComplete](iousbhost/iousbhostcimessagetypetransfercomplete.md)
- [IOUSBHostCIPortStateActive](iousbhost/iousbhostciportstateactive.md)
- [IOUSBHostCIPortStateOff](iousbhost/iousbhostciportstateoff.md)
- [IOUSBHostCIPortStatePowered](iousbhost/iousbhostciportstatepowered.md)
- [IOUSBHostCIPortStateSuspended](iousbhost/iousbhostciportstatesuspended.md)
- [IOUSBHostCIUserClientVersion100](iousbhost/iousbhostciuserclientversion100.md)

## See Also

### Reference

- [IOUSBHost Structures](iousbhost/iousbhost-structures.md)
- [IOUSBHost Enumerations](iousbhost/iousbhost-enumerations.md)
- [IOUSBHost Functions](iousbhost/iousbhost-functions.md)
- [IOUSBHost Data Types](iousbhost/iousbhost-data-types.md)