# Usb_DeviceArray
<!--Kit: Driver Development Kit-->
<!--Subsystem: Driver-->
<!--Owner: @lixinsheng2-->
<!--Designer: @w00373942-->
<!--Tester: @dong-dongzhen-->
<!--Adviser: @w_Machine_cc-->

## Overview

Defines the device ID list, which is used to store the device IDs and device quantity obtained using **OH_Usb_GetDevices**.

**Since**: 16

**Related module**: [UsbDDK](capi-usbddk.md)

**Header file:** [usb_ddk_types.h](capi-usb-ddk-types-h.md)

## Summary

### Member Variables

| Name| Description|
| -- | -- |
| uint64_t* deviceIds | Defines the start address of the device ID array. The number of device IDs cannot exceed 128.|
| uint32_t num | Defines the device quantity. Device IDs are obtained by traversing **deviceIds** based on the value of this parameter. If the value is **0**, there is no USB device.|