---
title: "IOUSBGetBillboardDescriptor(_:)"
framework: iousbhost
role: symbol
role_heading: Function
path: "iousbhost/iousbgetbillboarddescriptor(_:)"
---

# IOUSBGetBillboardDescriptor(_:)

Obtains the first billboard capability descriptor in a BOS descriptor.

## Declaration

```swift
func IOUSBGetBillboardDescriptor(_ bosDescriptor: UnsafePointer<IOUSBBOSDescriptor>!) -> UnsafePointer<IOUSBDeviceCapabilityBillboard>!
```

## Parameters

- `bosDescriptor`: A BOS descriptor that contains the descriptors to iterate through.

## Return Value

Return Value A billboard capability descriptor pointer, or nil if no matching descriptor returns.

## Discussion

Discussion This method uses IOUSBGetNextCapabilityDescriptorWithType(_:_:_:) to find the first billboard capability descriptor.

## See Also

### BOS Descriptor Parsing

- [IOUSBGetUSB20ExtensionDeviceCapabilityDescriptor(_:)](iousbhost/iousbgetusb20extensiondevicecapabilitydescriptor(_:).md)
- [IOUSBGetNextCapabilityDescriptorWithType(_:_:_:)](iousbhost/iousbgetnextcapabilitydescriptorwithtype(_:_:_:).md)
- [IOUSBGetNextCapabilityDescriptor(_:_:)](iousbhost/iousbgetnextcapabilitydescriptor(_:_:).md)
- [IOUSBGetSuperSpeedDeviceCapabilityDescriptor(_:)](iousbhost/iousbgetsuperspeeddevicecapabilitydescriptor(_:).md)
- [IOUSBGetContainerIDDescriptor(_:)](iousbhost/iousbgetcontaineriddescriptor(_:).md)