授权蓝牙并且搜索蓝牙设备

// 授权定位和蓝牙
authorizationBluetooth() {wx.getSetting({success: (res) => {if (res.authSetting.hasOwnProperty('scope.bluetooth')) {if (!res.authSetting['scope.bluetooth']) {this.setData({showManual: true})} else {this.bluetoothState()}} else {wx.authorize({scope: 'scope.bluetooth',success: () => {// 用户已经同意小程序使用手机蓝牙功能，后续调用 蓝牙 接口不会弹窗询问this.bluetoothState()},fail: () => {Toast('你已拒绝开启蓝牙功能')}})}}})
},
// 第一步，蓝牙初始化
bluetoothState() {wx.openBluetoothAdapter({mode: 'central',success: (res) => {console.log('第一步，蓝牙初始化成功', res)this.startBluetoothDevicesDiscovery()},fail: (err) => {console.log('蓝牙设备错误', err)if (err.errCode == 10001) {wx.onBluetoothAdapterStateChange((ress) => {if (ress.available) {this.startBluetoothDevicesDiscovery()} else {Toast('蓝牙设备不可用')}})} else {Toast('蓝牙设备不可用')}}})
},
// 第二步 开始搜索附近的蓝牙设备
startBluetoothDevicesDiscovery() {wx.startBluetoothDevicesDiscovery({allowDuplicatesKey: false,success: (res) => {this.onBluetoothDeviceFound()},})
},
// 第三步 监听发现附近的蓝牙设备
onBluetoothDeviceFound() {wx.showLoading({title: '重新搜索中',mask: true})wx.onBluetoothDeviceFound(() => {wx.getBluetoothDevices({success: res => {let deviceList = []if (res.devices.length > 0) {res.devices.forEach(v => {if (v.RSSI < 0 && v.name != '未知设备') {deviceList.push(v)}})}wx.hideLoading()this.setData({deviceList})}})})
},// 第四步、 建立连接
connectDevice(e) {const item = e.currentTarget.dataset.itemthis.setData({linkShow: true,activeItem: item}, () => {app.linkBluetooth(item.deviceId).then(res => {console.log('蓝牙连接成功', res)Toast('蓝牙连接成功')// 更新连接历史记录this.updateHisList(this.data.activeItem)this.setlinkDeviceId(this.data.activeItem.deviceId)this.setData({linkShow: false})}).catch(err => {console.log(err.message, err)Toast(err.message)this.closeBLEConnection(item.deviceId)this.setData({linkShow: false,})})})
},
// 断开蓝牙连接
closeBLEConnection(deviceId, tip) {app.closeBluetooth(deviceId).then(res => {this.setlinkDeviceId('')if (tip) {Toast(tip)}}).catch(err => {Toast('断开连接失败')})
},

连接断开方法

// 连接蓝牙
linkBluetooth(deviceId) {return new Promise((resolve, reject) => {wx.createBLEConnection({deviceId: deviceId,success: (res) => {setTimeout(() => {wx.getBLEDeviceServices({deviceId: deviceId,success: (res) => {for (let i = 0; i < res.services.length; i++) {if (res.services[i].isPrimary) {let serviceId = res.services[i].uuidlet Iswrite = falsewx.getBLEDeviceCharacteristics({deviceId,serviceId,success: (res) => {let characteristicId = ''for (let i = 0; i < res.characteristics.length; i++) {let item = res.characteristics[i]//支持写入就行了if (item.properties.write) {Iswrite = truecharacteristicId = item.uuid}}if (Iswrite) {wx.setStorageSync('linkDeviceId', deviceId)wx.setStorageSync('serviceId', serviceId)wx.setStorageSync('characteristicId', characteristicId)resolve({message: '蓝牙连接成功'})} else {reject({message: '蓝牙服务不支持此功能，已断开'})}},fail(err) {reject({message: '获取蓝牙低功耗设备某个服务中所有特征失败',err})}})return}}},fail(err) {reject({message: '获取蓝牙低功耗设备所有服务失败',err})}})}, 3000)},fail: (err) => {reject({message: '蓝牙连接失败',err})}})})
},
// 断开蓝牙连接
closeBluetooth(deviceId) {return new Promise((resolve, reject) => {wx.closeBLEConnection({deviceId: deviceId,success: res => {wx.removeStorageSync('linkDeviceId')wx.removeStorageSync('serviceId')wx.removeStorageSync('characteristicId')resolve(res)},fail: err => {wx.removeStorageSync('linkDeviceId')wx.removeStorageSync('serviceId')wx.removeStorageSync('characteristicId')reject(err)}})})
},

打印命令

// GBK的方法随便找一个就行
import GBK from './gbk.min.js';// 打印商品标签
export const printGoodsTag = (option) => {if (!wx.getStorageSync('linkDeviceId')) {wx.showToast({title: '请连接打印机',icon: 'none',mask: true})return}let data ='SIZE 40 mm,30 mm\n' +'GAP 2 mm,0 mm\n' +'DIRECTION 1\n' +'CLS\n' +`TEXT 20,30,"0",0,1,1,"商品名称:${option.goodsName}"\n` +`TEXT 20,80,"0",0,1,1,"规格:${option.skuName || ''}"\n` +`QRCODE 20,130,M,3,M,0,M1,S2,"${option.id}_1"\n` +`TEXT 120,140,"0",0,1,1,"零售价"\n` +`TEXT 120,180,"0",0,1.5,1.5,"￥${option.price || ''}"\n` +'PRINT 1,1'sendDataToDevice(new Uint8Array([...GBK.encode(data), ...[10]]).buffer);
}
// 打印维修单标签
export const printRepairTag = (option) => {if (!wx.getStorageSync('linkDeviceId')) {wx.showToast({title: '请连接打印机',icon: 'none',mask: true})return}let data ='SIZE 40 mm,30 mm\n' +'GAP 2 mm,0 mm\n' +'DIRECTION 1\n' +'CLS\n' +`QRCODE 20,30,M,3,M,0,M1,S2,"${option.id}_2"\n` +`TEXT 110,30,"0",0,1,1,"${option.equModel || ''}"\n` +`TEXT 110,60,"0",0,1,1,"${option.okey || ''}"\n` +`TEXT 110,90,"0",0,1,1,"${option.imei || ''}"\n`let str = option.reason || ''if (str) {let length = str.lengthlet maxNum = 12let top = 130for (let i = 0, len = length; i <= len; i += 12) {let text = str.slice(i, maxNum)data = data + `TEXT 20,${top},"0",0,1,1,"${text}"\n`maxNum += 12top += 30}}data = data + 'PRINT 1,1'sendDataToDevice(new Uint8Array([...GBK.encode(data), ...[10]]).buffer);
}const sendDataToDevice = value => {let byteLength = value.byteLength;const speed = 20;if (byteLength > 0) {wx.writeBLECharacteristicValue({deviceId: wx.getStorageSync('linkDeviceId'),characteristicId: wx.getStorageSync('characteristicId'),serviceId: wx.getStorageSync('serviceId'),value: value.slice(0, byteLength > speed ? speed : byteLength),success: res => {if (byteLength > speed) {sendDataToDevice(value.slice(speed, byteLength));} else {console.log('已完成打印   laster success', res);}},fail: err => {console.log(err)},});}
}