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IOUSBGetNextAssociatedDescriptorWithType(_:_:_:_:)

Obtains the next associated descriptor in a configuration descriptor and matches the type.

Declaration

func IOUSBGetNextAssociatedDescriptorWithType(_ configurationDescriptor: UnsafePointer<IOUSBConfigurationDescriptor>!, _ parentDescriptor: UnsafePointer<IOUSBDescriptorHeader>!, _ currentDescriptor: UnsafePointer<IOUSBDescriptorHeader>!, _ type: UInt8) -> UnsafePointer<IOUSBDescriptorHeader>!

Parameters

  • configurationDescriptor:

    A configuration descriptor that contains the descriptors to iterate through.

  • parentDescriptor:

    A descriptor pointer within the bounds of configurationDescriptor.

  • currentDescriptor:

    A descriptor pointer within the bounds of configurationDescriptor, or nil.

  • type:

    The descriptor type to find.

Return Value

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

Discussion

This method uses IOUSBGetNextAssociatedDescriptor(_:_:_:), and further validates that the returned descriptor’s bDescriptorType field matches the type that the parameter passes.

See Also

Configuration Descriptor Parsing