PATHHardware Documentation > USB Devices > Mac OS USB DDK API Reference

Device Notification Parameter Block

The parameter block for the device notification callback routine is defined as:

Field descriptions

--> pbLength

Length of parameter block

--> pbVersion

Version number of this parameter block

--> pbVersion

--> pbVersion

--> pbVersion

<--> usbDeviceNotification

The type of notification

The following notifications are defined:

kNotifyAnyEvent

kNotifyAddDevice

kNotifyAddInterface

kNotifyRemoveDevice

kNotifyRemoveInterface

--> reserved1[1]

Reserved, needed because of 2-byte 68k alignment

<-- usbDeviceRef

The device reference for the target device

<--> usbClass

The class of the target device, use kUSBAnyClass for any class

<--> usbSubClass

The subclass of the target device, use kUSBAnySubClass for any subclass

<--> usbProtocol

The protocol of the target device, use kUSBAnyProtocol for any protocol

<--> usbVendor

The vendor ID of the target device, use kUSBAnyVendor for any vendor

<--> usbProduct

The product ID of the target device, use kUSBAnyProduct for any product

<-- result

The status of the call

<-- token

The value returned to uniquely identify this particular device notification. You pass this value to the USBRemoveDeviceNotification function.

--> callback

A pointer to the callback routine to be called when the notification criteria is satisfied

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