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  "identifier" : "/documentation/IOUSBHost/IOUSBGetNextDescriptor(_:_:)",
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  "title" : "IOUSBGetNextDescriptor(_:_:)"
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# IOUSBGetNextDescriptor(_:_:)

Obtains the next descriptor in a configuration descriptor.

```
func IOUSBGetNextDescriptor(_ configurationDescriptor: UnsafePointer<IOUSBConfigurationDescriptor>!, _ currentDescriptor: UnsafePointer<IOUSBDescriptorHeader>!) -> UnsafePointer<IOUSBDescriptorHeader>!
```

## Parameters

`configurationDescriptor`

A configuration descriptor that contains the descriptors to iterate through.

`currentDescriptor`

A description header within the bounds of `configurationDescriptor`, or `nil`.

## Return Value

A descriptor pointer, or `nil` if no matching descriptor returns.

## Discussion

This method advances the current descriptor by its length, and validates that the new descriptor fits within the bounds of `configurationDescriptor`. Use `nil` for `currentDescriptor` to return the first descriptor after the configuration descriptor.

---

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