uni-app中uni.notifyBLECharacteristicValueChange报错 notifyBLECharacteristicValueChange:fail no descriptor
uni-app中uni.notifyBLECharacteristicValueChange报错 notifyBLECharacteristicValueChange:fail no descriptor
| 类别 | 信息 |
|---|---|
| 产品分类 | uniapp/App |
| PC开发环境 | Windows |
| PC版本号 | win11 |
| HBuilderX | 正式 |
| HBuilderX版本 | 4.29 |
| 手机系统 | Android |
| 手机版本号 | Android 10 |
| 手机厂商 | OnePlus 6 |
| 手机机型 | ONEPLUSA6000 |
| 页面类型 | vue |
| vue版本 | vue3 |
| 打包方式 | 离线 |
| 项目创建方式 | HBuilderX |
示例代码：
<script setup>
import { onLoad } from '@dcloudio/uni-app';
import { ref } from 'vue';
let deviceInfo = ref({});
let result = ref(null);
let device_service = ref([])
let device_characteristics = ref([])
let scanstorage = ref()
let tmp_predict = ref()
let NewMultiscan = ref()
let mresult = ref()
onLoad((options) => {
try {
deviceInfo.value = { ...JSON.parse(decodeURIComponent(options.device_info)) };
console.log("设备信息：", deviceInfo.value);
} catch (error) {
console.error("解析设备信息失败：", error);
}
});
function toScanAndPredict(){
console.log('开始扫描并且预测');
console.log(deviceInfo.value);
const deviceId = deviceInfo.value.deviceId;
let connect = false
uni.getBLEDeviceServices({
deviceId,
success(res){
console.log(res.services)
device_service.value = [...res.services]
const serviceId = device_service.value[9].uuid
uni.getBLEDeviceCharacteristics({
deviceId,
serviceId,
success(res){
const characteristicIdn = res.characteristics[17].uuid
const characteristicIdw = res.characteristics[16].uuid
console.log(res.characteristics)
device_characteristics.value = res.characteristics
console.log(device_characteristics.value[5])
addEventNotify(deviceId, device_service.value[9].uuid, device_characteristics.value[5])
},
fail(err){
console.log("获取特征值失败：", err);
}
})
},
fail(err){
console.log("获取服务失败：", err);
}
})
}
function addEventNotify(deviceId, serviceId, characteristicId){
uni.onBLECharacteristicValueChange(res => {
if(ab2ten(res.value)[0] == 255){
uni.offBLECharacteristicValueChange()
let scanIndex = ab2ten(res.value)
let buffer = new ArrayBuffer(4)
let dataView = new DataView(buffer)
dataView.setUint8(0, scanIndex[1])
dataView.setUint8(1, scanIndex[2])
dataView.setUint8(2, scanIndex[3])
dataView.setUint8(3, scanIndex[4])
uni.notifyBLECharacteristicValueChange({
deviceId: deviceId,
serviceId: serviceId,
characteristicId: characteristicIdn,
state: true,
success(res) {
console.log('return data n', res)
},
})
setTimeout(()=>{
uni.writeBLECharacteristicValue({
deviceId: deviceId,
serviceId: serviceId,
characteristicId: characteristicIdw,
value: buffer,
success(res) {
console.log('request data w', res)
},
})
},2000)
let d = ref([])
uni.onBLECharacteristicValueChange(res => {
let a = ab2ten(res.value)
console.log(a)
if (ab2ten(res.value)[0] != 0) {
a.shift()
Array.prototype.push.apply(d, a);
}
if (ab2ten(res.value)[0] == 202) {
uni.offBLECharacteristicValueChange()
if (that.data.multiscan) {
if (!scanstorage.value) {
var scanstorage = []
} else {
var scanstorage = scanstorage.value
}
Array.prototype.push.apply(scanstorage, d);
scanstorage.value = scanstorage
tmp_predict.value = scanstorage
NewMultiscan.value = false
mresult.value = '已完成' + String(scanstorage.length / 3822) + '次扫描'
}else{
console.log('d')
//发送数据
tmp_predict.value = d
}
}
})
}
});
uni.notifyBLECharacteristicValueChange({
deviceId: deviceId.toUpperCase(),
serviceId: serviceId.toUpperCase(),
characteristicId: device_characteristics.value[7].uuid.toUpperCase(),
state: true, // 启用 notify 功能
success: (res) => {
console.log('start scan n', res);
},
fail: (err)=>{
console.log({deviceId, serviceId})
console.log(device_characteristics.value[5])
console.log('开启扫描失败', err)
}
})
}
// ArrayBuffer转16进度字符串示例
function ab2hex(buffer) {
var hexArr = Array.prototype.map.call(
new Uint8Array(buffer),
function (bit) {
return ('00' + bit.toString(16)).slice(-2)
}
)
return hexArr.join('');
}
// ArrayBuffer转10进度字符串示例
function ab2ten(buffer) {
var hexArr = Array.prototype.map.call(
new Uint8Array(buffer),
function (bit) {
return (bit.toString(10))
}
)
return hexArr;
}
function ab2int(buffer) {
var hexArr = Array.prototype.map.call(
new Int16Array(buffer),
function (bit) {
return (bit.toString(10))
}
)
return hexArr;
}
</script>
操作步骤：
uni.notifyBLECharacteristicValueChange({
deviceId: deviceId.toUpperCase(),
serviceId: serviceId.toUpperCase(),
characteristicId: device_characteristics.value[7].uuid.toUpperCase(),
state: true, // 启用 notify 功能
success: (res) => {
console.log('start scan n', res);
},
fail: (err)=>{
console.log({deviceId, serviceId})
console.log(device_characteristics.value[5])
console.log('开启扫描失败', err)
}
})
预期结果：
console.log('start scan n', res);
实际结果：
console.log({deviceId, serviceId})
console.log(device_characteristics.value[5])
console.log('开启扫描失败', err)
bug描述：
报错信息
调用uni.notifyBLECharacteristicValueChange接口报错
“errMsg”: “notifyBLECharacteristicValueChange:fail no descriptor”,“code”: 10008
目前怀疑是uniapp识别不了相同特征值不同权限的蓝牙接口
