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// import './encoding.js'; // 如需要 中文乱码问题 new TextEncoder
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const printInteraction = {
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device_id: null,// 打印设备id
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service_id: '',
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write_id: '',
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notify_id: '',
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connFlag: false,
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services: [],
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stringData: [],
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callback: function () {},
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ab2hex: (buffer) => {//ArrayBuffer转16进度字符串示例
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const hexArr = Array.prototype.map.call(
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new Uint8Array(buffer),
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function (bit) {
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return ('00' + bit.toString(16)).slice(-2)
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}
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)
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return hexArr.join('')
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},
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// 获取蓝牙状态是否开启 准备
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getBluetooth: (callback) => {
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const _this = printInteraction;
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uni.getBluetoothAdapterState({
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success(res) {
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if (res.available) { // 蓝牙适配器是否可用
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callback && _this.startSearch(callback)
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} else {
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uni.showToast({
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title: '本机蓝牙不可用',
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duration: 2000,
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icon: 'none'
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});
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}
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},
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fail(err) {
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uni.showToast({
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title: '本机蓝牙不可用',
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duration: 2000,
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icon: 'none'
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});
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}
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});
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},
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// 初始化蓝牙
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init: () => {
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const _this = printInteraction;
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uni.openBluetoothAdapter({
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success(res) {
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uni.getBluetoothAdapterState({
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success(res) {
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if (res.available) { // 蓝牙适配器是否可用
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if (res.discovering) { // 蓝牙适配器是否处于搜索状态
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// 立即停止搜索 节约电
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_this.stopSearch();
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}
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}
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}
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});
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},
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fail(err) {
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setTimeout(function () {
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uni.showToast({
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title: '蓝牙打开失败，请打开蓝牙',
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duration: 2000,
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icon: 'none'
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});
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}, 200)
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}
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})
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},
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// 搜索附近蓝牙，并获取蓝牙列表
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startSearch: (callback) => {
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const _this = printInteraction;
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uni.showLoading({
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title: '正在搜索...'
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});
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uni.startBluetoothDevicesDiscovery({ // 开始搜索蓝牙设备
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allowDuplicatesKey: true,
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powerLevel: 'high',
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success(res) {
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setTimeout(function () {
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uni.getBluetoothDevices({ // 获取蓝牙列表
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success(re) {
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callback(re)
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},
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fail(err) {
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uni.showToast({
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title: '获取设备失败',
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duration: 2000,
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icon: 'error'
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});
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}
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});
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_this.stopSearch();
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uni.hideLoading();
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}, 5000);
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},
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fail(err) {
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uni.showToast({
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title: '搜索失败',
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duration: 2000,
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icon: 'error'
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});
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}
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})
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},
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// 连接蓝牙设备
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connectDevice: (device_id) => {
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const _this = printInteraction;
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if (_this.device_id) {
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// 对刚才的连接设备进行断开
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_this.breakConnction();
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}
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if (device_id) {
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uni.showLoading({
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title: '正在连接'
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});
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uni.createBLEConnection({
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// 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
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deviceId:device_id,
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success(res) {
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_this.device_id = device_id;
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uni.showToast({
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title: '连接成功',
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duration: 2000,
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icon: 'error'
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});
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// 安卓设备 需要等待1.5秒之后
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_this.getDeviceService();
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},
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fail(err) {
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uni.showToast({
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title: `连接失败！${err.code}`,
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duration: 2000,
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icon: 'none'
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});
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},
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complete() {
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uni.hideLoading();
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}
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});
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} else {
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uni.showToast({
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title: '请选择蓝牙设备',
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duration: 2000,
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icon: 'error'
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});
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}
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},
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// 获取蓝牙设备所有服务
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getDeviceService: () => {
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const _this = printInteraction;
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uni.getBLEDeviceServices({
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deviceId: _this.device_id,
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success(res) {
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_this.services = res.services;
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res.services.some(item => {
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if (item.isPrimary) {
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_this.service_id = item.uuid;
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return true;
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}
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});
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_this.getDeviceCharacter();
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}
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})
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},
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// 获取连接设备服务的所有特征值
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getDeviceCharacter: () => {
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const _this = printInteraction;
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uni.getBLEDeviceCharacteristics({
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deviceId: _this.device_id,
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serviceId: _this.service_id,
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success(res) {
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let notify_id, write_id, read_id;
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res.characteristics.forEach(item => {
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if (item.properties.notify) {
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notify_id = item.uuid;
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}
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if (item.properties.write) {
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write_id = item.uuid;
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}
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if (item.properties.read) {
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read_id = item.uuid;
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}
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});
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if (notify_id != null && write_id != null) {
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_this.notify_id = notify_id;
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_this.write_id = write_id;
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_this.read_id = read_id;
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if (_this.connFlag) { // 发送失败进来自动再次点击 | 或手动点击按钮重新打印
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_this.printer(_this.stringData, _this.callback);
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}
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}
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},
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fail(err) {
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// _this.getDeviceService(); // 再次获取服务uuid（可能导致死循环 需要进行判断）
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uni.showToast({
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title: err.code || '没有找到特征值',
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duration: 2000,
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icon: 'error'
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});
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}
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})
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},
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// 字符串转为ArrayBuffer
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stringToArrayBuffer: (str) => {
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const len = str.length * 2; // 一个中文占 二个字节， 其它字母 占二个字节
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const buf = new ArrayBuffer(len);
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const bufView = new Uint8Array(buf);
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for (let i = 0, strLen = str.length; i < strLen; i++) {
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// console.log('1',str.charCodeAt(i)); // 对特殊字符不支持 如：表情emoji,麻将图案等
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// console.log('2',str.codePointAt(i)); // 对特殊字符可以支持
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bufView[i] = str.charCodeAt(i);
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}
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return buf;
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},
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// 开始打印
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printer: (stringData, callback) => {
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const _this = printInteraction;
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if (!_this.device_id) {
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uni.showToast({
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title: "请选择蓝牙设备",
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duration: 2000,
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icon: 'error'
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});
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return;
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}
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uni.showLoading({
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title: '正在打印'
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});
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_this.connFlag = true;
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_this.stringData = stringData;
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_this.callback = callback;
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let buffer = null;
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stringData.forEach(item => {
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_this._writeBLECharacteristicValue(_this.stringToArrayBuffer(item));
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});
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},
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_writeBLECharacteristicValue: (buffer) => {
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const _this = printInteraction;
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// 字节长度小于等于20 只调用一次
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if (buffer.byteLength <= 20) {
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uni.writeBLECharacteristicValue({
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deviceId: _this.device_id,
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serviceId: _this.service_id,
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characteristicId: _this.notify_id,
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value: buffer,
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writeType: "write", //iOS 优先 write，安卓优先 writeNoResponse
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success(res) {
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_this.connFlag = false;
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_this.callback();
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},
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fail(err) {
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// 换一个uuid获取特征值重新写入 （或者 手动去点击打印，可能需要连续点击多次）
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if (_this.services.length) {
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_this.services.splice(0, 1);
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_this.services.some(item => {
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if (item.isPrimary) {
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_this.service_id = item.uuid;
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return true;
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}
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});
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_this.getDeviceCharacter();
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}
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},
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complete() {
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uni.hideLoading();
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}
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})
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} else {
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// 进行分包 最大20字节长度
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const newBuffer = buffer.slice(20);
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const writeBuffer = buffer.slice(0, 20);
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uni.writeBLECharacteristicValue({
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deviceId: _this.device_id,
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serviceId: _this.service_id,
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characteristicId: _this.notify_id,
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value: writeBuffer,
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writeType: "write", //iOS 优先 write，安卓优先 writeNoResponse
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success(res) {
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// console.log('递归发送成功 继续发送');
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_this._writeBLECharacteristicValue(newBuffer);
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},
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fail(err) {
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// console.log('递归发送失败', err.code);
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// 一旦发生失败，就要重新发送一遍，（另有需求断点发送 可保存newBuffer变量）
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uni.hideLoading();
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if (_this.services.length) {
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_this.services.splice(0, 1);
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_this.services.some(item => {
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if (item.isPrimary) {
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_this.service_id = item.uuid;
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return true;
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}
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});
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_this.getDeviceCharacter();
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}
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}
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})
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}
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},
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// 停止搜索
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stopSearch: () => {
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uni.stopBluetoothDevicesDiscovery({
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success(res) {}
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})
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},
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// 关闭蓝牙适配器
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closeBluetoothAdapter: () => {
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uni.closeBluetoothAdapter({
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success(res) {
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console.log('关闭蓝牙适配器')
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}
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})
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},
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// 断开连接
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breakConnction: () => {
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const _this = printInteraction;
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if (_this.device_id) {
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uni.closeBLEConnection({
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deviceId: _this.device_id,
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success() {
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_this.connFlag = false;
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}
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});
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}
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},
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}
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export default printInteraction;
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