001：格式
<script> const LAST_CONNECTED_DEVICE = 'last_connected_device' import PrinterJobs from '../../common/printer/printerjobs' import printerUtil from '../../common/printer/printerutil' function inArray(arr, key, val) { for (let i = 0; i < arr.length; i ) { if (arr[i][key] === val) { return i } } return -1 } // ArrayBuffer转16进度字符串示例 function ab2hex(buffer) { const hexArr = Array.prototype.map.call( new Uint8Array(buffer), function(bit) { return ('00' bit.toString(16)).slice(-2) } ) return hexArr.join(',') } function str2ab(str) { // Convert str to ArrayBuff and write to printer let buffer = new ArrayBuffer(str.length) let dataView = new DataView(buffer) for (let i = 0; i < str.length; i ) { dataView.setUint8(i, str.charAt(i).charCodeAt(0)) } return buffer; } export default { data() { return { devices: [], } }， onLoad(e) { const lastDevice = uni.getStorageSync(LAST_CONNECTED_DEVICE); this.lastDevice = lastDevice // 初始化蓝牙 this.openBluetoothAdapter() }, } </script>蓝牙的初始化
// 蓝牙模块的初始化 openBluetoothAdapter() { if (!uni.openBluetoothAdapter) { uni.showModal({ title: this.$t('wechat.w102'), /提示， content: this.$t('wechat.w226') //目前微信版本太低，如果您不能使用此功能，请在升级到最新的微信版本后重试。' }) return } uni.openBluetoothAdapter({ success: (res) => { console.log('openBluetoothAdapter success', res) // 搜索附近的蓝牙 this.startBluetoothDevicesDiscovery() }, fail: (res) => { console.log('openBluetoothAdapter fail', res) if (res.errCode === 10001) { uni.showModal({ title: this.$t('wechat.w227'), //错误 content: this.$t('wechat.w228'), 没有找到蓝牙设备， 打开蓝牙后请重试。', showCancel: false }) // 监控蓝牙适配器状态变化 uni.onBluetoothAdapterStateChange((res) => { console.log('onBluetoothAdapterStateChange', res) // available：蓝牙适配器是否可用 if (res.available) { // 取消监听，否则stopBluetoothDevicesDiscovery之后还会继续触发onBluetoothAdapterStateChange， // 导致再次调用startBluetoothDevicesDiscovery uni.onBluetoothAdapterStateChange(() => {}); // 开始搜索附近的蓝牙外围设备 this.startBluetoothDevicesDiscovery() } }) } } }) uni.onBLEConnectionStateChange((res) => { // 该方法可用于处理连接意外断开等异常情况 console.log('onBLEConnectionStateChange', `device ${res.deviceId} state has changed, connected: ${res.connected}`) this.connected = res.connected if (!res.connected) { uni.showModal({ title: this.$t('wechat.w227'), //错误 content: this.$t('wechat.w229'), //蓝牙连接已断开 showCancel: false }) } }); },2.搜索附近的蓝牙设备
// 开始搜索附近的蓝牙外围设备 startBluetoothDevicesDiscovery() { if (this._discoveryStarted) { return } this._discoveryStarted = true uni.startBluetoothDevicesDiscovery({ success: (res) => { console.log('startBluetoothDevicesDiscovery success111', res) // 监控寻找新设备的事件 this.onBluetoothDeviceFound() }, fail: (res) => { console.log('startBluetoothDevicesDiscovery fail', res) } }) },3.监控寻找新设备的事件
// 监控寻找新设备的事件 onBluetoothDeviceFound() { uni.onBluetoothDeviceFound((res) => { console.log( res) res.devices.forEach(device => { if (!device.name && !device.localName) { return } const foundDevices = this.devices const idx = inArray(foundDevices, 'deviceId', device.deviceId) const data = {} if (idx === -1) { this.$set(this.devices, `${foundDevices.length}`, device) } else { this.$set(this.devices, `${idx}`, device) } // console.log(this.devices) }) }) },点击连接蓝牙
// 点击链接蓝牙 createBLEConnection(e) { console.log(点击连接蓝牙， e) const deviceId = e.deviceId const name = e.name this._createBLEConnection(deviceId, name) }, // 连接蓝牙设备 _createBLEConnection(deviceId, name) { this.$myToast(this.$t('wechat.w224'), 'loading') ///连接设备 // 连接低功耗蓝牙设备 uni.createBLEConnection({ deviceId, // 用于区分设备 id success: () => { console.log('createBLEConnection success', this.devices); this.devices.forEach((item, index) => { this.$set(this.devices[index], 'isShowConnect', false) if (item.deviceId == deviceId) { this.$set(this.devices[index], 'isShowConnect', true) } }) this$myToast(this.$t('wechat.w225'), 'success') //设备连接成功
this.connected = true
this.isConnected = false
this.name = name
this.deviceId = deviceId
//延迟1.5s获取设备的services
setTimeout(() => {
// 获取蓝牙设备所有服务(service)
this.getBLEDeviceServices(deviceId)
}, 3000);
// 最后连接设备
uni.setStorage({
key: LAST_CONNECTED_DEVICE,
data: name + ':' + deviceId
})
},
complete() {
uni.hideLoading()
},
fail: (res) => {
// 连接蓝牙接口调用失败
console.log('createBLEConnection fail', res)
}
})
// 已经找到需要的蓝牙设备,停止搜寻附近的蓝牙外围设备
this.stopBluetoothDevicesDiscovery()
},
// 已经找到需要的蓝牙设备,停止搜寻附近的蓝牙外围设备
stopBluetoothDevicesDiscovery() {
uni.stopBluetoothDevicesDiscovery({
complete: () => {
// console.log('stopBluetoothDevicesDiscovery')
this._discoveryStarted = false
}
})
},5.获取蓝牙设备所有服务
// 获取蓝牙设备所有服务(service)
getBLEDeviceServices(deviceId) {
uni.getBLEDeviceServices({
deviceId,
success: (res) => {
console.log('获取蓝牙设备所有服务getBLEDeviceServices', res)
for (let i = 0; i < res.services.length; i++) {
// #ifdef MP-WEIXIN
if (res.services[i].isPrimary) {
this.getBLEDeviceCharacteristics(deviceId,res.services[i].uuid)
return
}
// #endif
// #ifdef APP-PLUS
if (res.services[i].uuid === '0000FF00-0000-1000-8000-00805F9B34FB') {
console.log('App的服务序号', res.services[i].uuid)
this.getBLEDeviceCharacteristics(deviceId, res.services[i].uuid)
return
}
// #endif
}
}
})
},6.获取特征值
/*
获取蓝牙设备某个服务中所有特征值(characteristic)
characteristic:
uuid:蓝牙设备特征值的 uuid
properties:该特征值支持的操作类型
*/
getBLEDeviceCharacteristics(deviceId, serviceId) {
uni.getBLEDeviceCharacteristics({
// 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
deviceId,
// 这里的 serviceId(蓝牙服务 uuid) 需要在 getBLEDeviceServices 接口中获取
serviceId,
success: (res) => {
console.log('特征值getBLEDeviceCharacteristics success', deviceId, serviceId, res, res
.characteristics)
// 这里会存在特征值是支持write，写入成功但是没有任何反应的情况
// 只能一个个去试
// characteristics：设备服务列表
for (let i = 0; i < res.characteristics.length; i++) {
const item = res.characteristics[i]
if (item.properties.write) {
this.canWrite = true
this._deviceId = deviceId
this._serviceId = serviceId
this._characteristicId = item.uuid
break;
}
}
},
fail(res) {
console.error('getBLEDeviceCharacteristics', res)
}
})
},7.点击打印写入数据
// 点击打印：写入数据
writeBLECharacteristicValue() {
this.isLoading = true
setTimeout(() => {
this.isDisabled = false
this.isLoading = false
}, 3000)
let printerJobs = new PrinterJobs();
const {
channels,
header,
dataList
} = this.printInfo
console.log('通道数据', dataList)
let title = ''
header.forEach(item => {
title = `${item.name} `
})
// 要打印的头部信息
printerJobs
.setAlign('ct')
.setSize(2, 2)
.print(this.$t('wechat.w221')) //'记录报告'
.setSize(0, 0)
.print()
.setAlign('lt')
.setSize(1, 1)
.print(`${this.$t('wechat.w51')}：${this.info.name}`) //设备名称
.print(`${this.$t('wechat.w76')}：${this.info.modelName}`) //设备型号
.print(`${this.$t('wechat.w46')}：${this.info.deviceSerial}`) //序列号
.print(`${this.$t('wechat.w100')}：${this.userInfo.relName}`) //用户名
.print(`${this.$t('wechat.w101')}：${this.remark}`) //备注
if (this.isEn) {
channels.forEach(item => {
printerJobs.print(`${item.name}(Max)：${item.max}${item.unitIcon}`)
.print(`${this.$t('wechat.w148')}：${this.$timestampToTimeEn(item.maxDate)}`) //时间
.print(`${item.name}(Min)：${item.min}${item.unitIcon}`)
.print(`${this.$t('wechat.w148')}：${this.$timestampToTimeEn(item.minDate)}`) //时间
})
} else {
channels.forEach(item => {
printerJobs.print(`${item.name}(Max)：${item.max}${item.unitIcon}`)
.print(`${this.$t('wechat.w148')}：${this.$timestampToTime2(item.maxDate)}`) //时间
.print(`${item.name}(Min)：${item.min}${item.unitIcon}`)
.print(`${this.$t('wechat.w148')}：${this.$timestampToTime2(item.minDate)}`) //时间
})
}
printerJobs.print(printerUtil.fillLine())
.setSize(1, 1)
let titleStr = ''
header.forEach((item, index) => {
titleStr = titleStr + `${index==0?'':' '}` + `${item.name}`
})
printerJobs.print(printerUtil.inline(this.$t('wechat.w222'),
`${titleStr}`)) //记录时间
// 打印'----------------'
printerJobs.print(printerUtil.fillLine())
// 要打印的内容
dataList.forEach(item => {
let str = ''
header.forEach((item2, index2) => {
// 暂无
str = str + `${index2==0?'':' '}` +
`${item[item2.columnName]?item[item2.columnName].toFixed(2):this.$t('wechat.w71empty')}`
})
if (this.isEn) {
printerJobs.print(printerUtil.inline(`${this.$timestampToTimeEn2(item.dataTime)}`,
`${str}`))
} else {
printerJobs.print(printerUtil.inline(`${this.$timestampToTime3(item.dataTime)}`,
`${str}`))
}
// console.log(`${item.dataTime}`, str);
})
// 结尾
printerJobs.println()
.print(`${this.$t('wechat.w223')}：`) //'签名
.println()
.println()
let buffer = printerJobs.buffer();
// console.log('ArrayBuffer', 'length: ' + buffer.byteLength, ' hex: ' + ab2hex(buffer));
// 1.并行调用多次会存在写失败的可能性
// 2.建议每次写入不超过20字节
// 分包处理，延时调用
const maxChunk = 20;
const delay = 40;
for (let i = 0, j = 0, length = buffer.byteLength; i < length; i += maxChunk, j++) {
let subPackage = buffer.slice(i, i + maxChunk <= length ? (i + maxChunk) : length);
// subPackage：参数
setTimeout(this._writeBLECharacteristicValue, j * delay, subPackage);
}
},
// 向低功耗蓝牙设备特征值中写入二进制数据。注意：必须设备的特征值支持 write 才可以成功调用。
_writeBLECharacteristicValue(buffer) {
uni.writeBLECharacteristicValue({
deviceId: this._deviceId, // 蓝牙设备 id
serviceId: this._serviceId, // 蓝牙特征值对应服务的 uuid
characteristicId: this._characteristicId, // 蓝牙特征值的 uuid
value: buffer, // 蓝牙设备特征值对应的二进制值
success(res) {
console.log('writeBLECharacteristicValue success', res)
},
fail(res) {
console.log('writeBLECharacteristicValue fail', res)
}
})
},8.离开关闭蓝牙
//关闭蓝牙
onUnload() {
this.closeBluetoothAdapter()
},
closeBluetoothAdapter() {
uni.closeBluetoothAdapter()
this._discoveryStarted = false
},