HarmonyOS 设备管理开发：USB 服务开发指导

```ts// 导入USB接口api包。import usb from '@ohos.usbManager';// 获取设备列表。let deviceList : Array<usb.USBDevice> = usb.getDevices();/deviceList结构示例[  {    name: "1-1",    serial: "",    manufacturerName: "",    productName: "",    version: "",    vendorId: 7531,    productId: 2,    clazz: 9,    subClass: 0,    protocol: 1,    devAddress: 1,    busNum: 1,    configs: [      {        id: 1,        attributes: 224,        isRemoteWakeup: true,        isSelfPowered: true,        maxPower: 0,        name: "1-1",        interfaces: [          {            id: 0,            protocol: 0,            clazz: 9,            subClass: 0,            alternateSetting: 0,            name: "1-1",            endpoints: [              {                address: 129,                attributes: 3,                interval: 12,                maxPacketSize: 4,                direction: 128,                number: 1,                type: 3,                interfaceId: 0,              }            ]          }        ]      }    ]  }]/

```ts import usb from '@ohos.usbManager'; import { BusinessError } from '@ohos.base'; let deviceName : string = deviceList[0].name;// 申请操作指定的device的操作权限。usb.requestRight(deviceName).then((hasRight : boolean) => {  console.info("usb device request right result: " + hasRight);}).catch((error : BusinessError)=> {  console.info("usb device request right failed : " + error);});```

```ts// 打开设备，获取数据传输通道。let interface1 = deviceList[0].configs[0].interfaces[0];let interface1 : number = deviceList[0].configs[0].interfaces[0];/ 打开对应接口，在设备信息（deviceList）中选取对应的interface。interface1为设备配置中的一个接口。/usb.claimInterface(pipe, interface1, true);

import usb from '@ohos.usbManager'; import { BusinessError } from '@ohos.base';/* 读取数据，在device信息中选取对应数据接收的endpoint来做数据传输（endpoint.direction == 0x80）；dataUint8Array是要读取的数据，类型为Uint8Array。*/let inEndpoint : USBEndpoint = interface1.endpoints[2];let outEndpoint : USBEndpoint = interface1.endpoints[1];let dataUint8Array : Array<number> = new Uint8Array(1024);usb.bulkTransfer(pipe, inEndpoint, dataUint8Array, 15000).then((dataLength : number) => {if (dataLength >= 0) {  console.info("usb readData result Length : " + dataLength);} else {  console.info("usb readData failed : " + dataLength);}}).catch((error : BusinessError) => {console.info("usb readData error : " + JSON.stringify(error));});// 发送数据，在device信息中选取对应数据发送的endpoint来做数据传输。（endpoint.direction == 0）usb.bulkTransfer(pipe, outEndpoint, dataUint8Array, 15000).then((dataLength : number) => {  if (dataLength >= 0) {    console.info("usb writeData result write length : " + dataLength);  } else {    console.info("writeData failed");  }}).catch((error : BusinessError) => {  console.info("usb writeData error : " + JSON.stringify(error));});

```tsusb.releaseInterface(pipe, interface1);usb.closePipe(pipe);```