HarmonyOS usbManager.claimInterface返回-1？

Question

1、getDevices返回设备列表，里面有对一个设备；

2、requestRight返回true；

3、connectDevice返回了USBDevicePipe；

4、读写需要的UsbEnpoint也已经找到；

5、setConfiguration返回0；

6、claimInterface返回-1；

let devicesList: Array<usbManager.USBDevice> = usbManager.getDevices();
devicesList.forEach((value: usbManager.USBDevice) => {

  if (value.vendorId == 0x5000 && value.productId == 0x500) {
    console.log("openDevice this._device 1");
    this._device = value
    return
  }
})
let right = usbManager.hasRight(this._device.name)
console.log("device hasRight " + right); //此处第一次返回false，requestRight后返回true
this._devicepipe = usbManager.connectDevice(this._device)
this._deviceInterface = this._device!!.configs[0].interfaces[0];
let endpoints = this._deviceInterface.endpoints
console.log("device endpoints " + endpoints.length); //有值
this._usbOut = endpoints.find(endpoint => endpoint.direction ==
  0)
console.log("usbOut " + JSON.stringify(this._usbOut)); //有值
this._usbIn = endpoints.find(endpoint => endpoint.direction ==
  128)
console.log("usbIn " + JSON.stringify(this._usbIn)); //有值
let config: usbManager.USBConfiguration = this._device!!.configs[0];
let ret1 = usbManager.setConfiguration(this._devicepipe, config);
console.log("device setConfiguration ret1 " + ret1); //返回0
let ret2: number = usbManager.claimInterface(this._devicepipe, this._deviceInterface);
console.log("device claimInterface ret2 " + ret2); //返回-1
ret2 = usbManager.setInterface(this._devicepipe, this._deviceInterface);
console.log("device setInterface ret2 " + ret2); //返回-1

Answer 1

let right = usbManager.hasRight(this._device.name)
console.log("device hasRight " + right); //此处第一次返回false，requestRight后返回true

可能是在返回的false的时候已经调用了claimInterface接口，可在requestRight接口回调中尝试调用claimInterface。

参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-usb-deprecated-V5\#usbhasright