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# tIOUSBDescriptorType

Constants describing the types of descriptors available for a USB device.

```
enum tIOUSBDescriptorType : unsigned int;
```

## Overview

When you fetch descriptors from a USB device, the data includes a one-byte value that indicates the type of the descriptor. Use these constants to determine the type.

For detailed information about the descriptor types, see Table 9-5 of the USB 2.0 specification and Table 9-6 of the USB 3.0 specification at <https://www.usb.org/>.

## Topics

### Getting the Descriptor Type

[`kIOUSBDescriptorTypeDevice`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeDevice)

The type for a device descriptor.

[`kIOUSBDescriptorTypeConfiguration`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeConfiguration)

The type for a configuration descriptor.

[`kIOUSBDescriptorTypeString`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeString)

The type for a string descriptor.

[`kIOUSBDescriptorTypeInterface`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeInterface)

The type for an interface descriptor.

[`kIOUSBDescriptorTypeEndpoint`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeEndpoint)

The type for an endpoint descriptor.

[`kIOUSBDescriptorTypeDeviceQualifier`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeDeviceQualifier)

The type for a device qualifier descriptor.

[`kIOUSBDescriptorTypeOtherSpeedConfiguration`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeOtherSpeedConfiguration)

The type for an other speed configuration descriptor.

[`kIOUSBDescriptorTypeInterfacePower`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeInterfacePower)

The type for an interface power descriptor.

[`kIOUSBDescriptorTypeOTG`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeOTG)

The type for an on-the-go descriptor.

[`kIOUSBDescriptorTypeDebug`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeDebug)

The type for a debug descriptor.

[`kIOUSBDescriptorTypeInterfaceAssociation`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeInterfaceAssociation)

The type for an interface association descriptor.

[`kIOUSBDescriptorTypeBOS`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeBOS)

The type for a binary object store descriptor.

[`kIOUSBDescriptorTypeDeviceCapability`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeDeviceCapability)

The type for a capability descriptor.

[`kIOUSBDecriptorTypeHID`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDecriptorTypeHID)

The type for a human interaction device descriptor.

[`kIOUSBDecriptorTypeReport`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDecriptorTypeReport)

The type for a report descriptor.

[`kIOUSBDescriptorTypePhysical`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypePhysical)

The type for a physical descriptor.

[`kIOUSBDescriptorTypeHub`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeHub)

The type for a hub descriptor.

[`kIOUSBDescriptorTypeSuperSpeedHub`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeSuperSpeedHub)

The type for a super-speed hub descriptor.

[`kIOUSBDescriptorTypeSuperSpeedUSBEndpointCompanion`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeSuperSpeedUSBEndpointCompanion)

The type for a super-speed endpoint companion descriptor.

[`kIOUSBDescriptorTypeSuperSpeedPlusIsochronousEndpointCompanion`](/documentation/USBDriverKit/tIOUSBDescriptorType/kIOUSBDescriptorTypeSuperSpeedPlusIsochronousEndpointCompanion)

The type for a super-speed plus isochronous endpoint companion descriptor.


---

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