蓝牙模块封装代码
class BluetoothClass{
constructor(deviceId,serviceId,notifyId,writeId){
this.deivceList_find = []
this.deviceId = deviceId
this.serviceId = serviceId
this.notifyId = notifyId
this.writeId = writeId
}
//获取所有蓝牙设备列表
GetDeviceList(){
this.deivceList_find = []
//初始化蓝牙模块
uni.openBluetoothAdapter({
success(res) {
console.log(res)
},
fail(err) {
console.log(err)
console.log(初始化蓝牙模块)
}
})
//开始搜素蓝牙模块
setTimeout(() => {
uni.startBluetoothDevicesDiscovery({
success(res) {
console.log(res)
},
fail(err) {
console.log(err)
},
complete() {
console.log('寻找蓝牙设备')
}
})
}, 1000)
uni.onBluetoothDeviceFound(function(devices) {
// console.log('添加搜索到的名字不为空的设备')
if (devices.devices[0].name != '') {
console.log(devices)
var flag = true
this.deivceList_find.forEach(item => {
if (item.name == devices.devices[0].name) {
flag = false
}
})
if (flag) {
this.deivceList_find.push(devices.devices[0])
}
}
})
}
//监听蓝牙设备
Notify(){
uni.stopBluetoothDevicesDiscovery({
success(res) {
console.log('停止蓝牙搜索')
console.log(res)
}
})
uni.startBluetoothDevicesDiscovery({
success(res) {
console.log(res)
},
fail(err) {
console.log(err)
}
})
//创建蓝牙连接,需要延时2s~5s
async function CreateBLEConnection() {
return new Promise((resolve, reject) => {
console.log('开始创建蓝牙连接')
setTimeout(() => {
uni.createBLEConnection({
deviceId: this.deviceId,
success(res) {
console.log(res)
resolve(res)
},
fail(err) {
console.log(err)
reject(err)
},
complete() {
}
})
}, 1000)
})
}
//获取所有蓝牙服务
async function GetBLEDeviceServices() {
return new Promise((resolve, reject) => {
console.log('开始获取所有蓝牙服务')
setTimeout(() => {
uni.getBLEDeviceServices({
deviceId: this.deviceId,
success(res) {
console.log(res)
resolve(res)
},
fail(err) {
console.log(err)
reject(err)
}
})
}, 5000)
})
}
//获取蓝牙特征值
async function GetBLEDeviceCharacteristics() {
return new Promise((resolve, reject) => {
console.log('开始获取蓝牙特征值')
setTimeout(() => {
uni.getBLEDeviceCharacteristics({
deviceId: this.deviceId,
serviceId: this.serviceId,
success(res) {
console.log(res)
resolve(res)
},
fail(err) {
console.log(err)
reject(err)
}
})
}, 1000)
})
}
//开始蓝牙监听
async function NotifyBLECharacteristicValueChange() {
return new Promise((resolve, reject) => {
console.log('开始蓝牙监听')
uni.notifyBLECharacteristicValueChange({
deviceId: this.deviceId,
serviceId: this.serviceId,
characteristicId: this.notifyId,
success(res) {
resolve(res)
console.log(res)
console.log('蓝牙连接成功！')
},
fail(err) {
console.log(err)
reject(err)
}
})
})
}
async function BluetoothConnect() {
console.log('开始异步连接通讯')
await CreateBLEConnection()
await GetBLEDeviceServices()
await GetBLEDeviceCharacteristics()
await NotifyBLECharacteristicValueChange().then(res => {
})
}
BluetoothConnect()
}
//写入蓝牙通讯信息，maxCount用于记录蓝牙模块循环次数，因为蓝牙一次最大只能发送20字节的数据
Write(sendMsg,maxCount){
uni.stopBluetoothDevicesDiscovery({
success(res) {
console.log('停止蓝牙搜索')
console.log(res)
}
})
async function writeBLECharacteristicValue(e) {
var typedArray = new Uint8Array(e.match(/[\da-f]{2}/gi).map(function(h) {
return parseInt(h, 16)
}))
var buffer = typedArray.buffer
console.log('开始写入蓝牙')
return new Promise((resolve, reject) => {
setTimeout(() => {
uni.writeBLECharacteristicValue({
deviceId: this.deviceId,
serviceId: this.serviceId,
characteristicId: this.writeId,
value: buffer,
success(res) {
console.log(res)
resolve(res)
},
fail(err) {
console.log(err)
reject(err)
}
})
}, 2000)
})
}
async function write() {
await writeBLECharacteristicValue(sendMsg).catch(err => {
})
}
write()
function ab2hex(buffer) {
const hexArr = Array.prototype.map.call(
new Uint8Array(buffer),
function(bit) {
return ('00' + bit.toString(16)).slice(-2)
}
)
return hexArr.join('')
}
var count = 0
//返回一个Promise对象，请用async和await进行异步
return new Promise((rejects, resolve) => {
uni.onBLECharacteristicValueChange(function(res) {
console.log('接受到订阅值！')
console.log(ab2hex(res.value))
data += ab2hex(res.value)
count++
if (count == maxCount) {
console.log('返回值为：' + data)
rejects(data)
}
})
})
}
}
module.exports = BluetoothClass
代码介绍
实例化
//在js文件的开头引用
const BluetoothClass = require('@/utils/BluetoothHelper.js')
//实例化js对象
const _bluetoothClass = new BluetoothClass('84:C2:E4:40:86:47', '9ECADC24-0EE5-A9E0-93F3-A3B50100406E',
'9ECADC24-0EE5-A9E0-93F3-A3B50300406E', '9ECADC24-0EE5-A9E0-93F3-A3B50200406E')
测试代码
BluetoothTest(index) {
switch (index) {
case 1:
//获取有名字的蓝牙设备列表
_bluetoothClass.GetDeviceList()
break
case 2:
//先监听
_bluetoothClass.Notify()
break
case 3:
//监听之后写入才有返回值
_bluetoothClass.Write('AA0103009800940000', 2).then(res=>{
console.log(res)
})
break
case 4:
//打印获取的蓝牙设备列表
console.log(_bluetoothClass.deivceList_find)
break
}
},