1.基础开发环境，所用到的 Api 以及实现的思路。
应用场景：
商家打印小票，小票包含顾客消费的商品明细信息以及末尾附上二维码，二维码供顾客扫码开票。
HbuilderX开发工具：
HBuilderX-高效极客技巧HBuilderX是当前最快的HTML开发工具，强大的代码助手帮你快速完成开发，最全的语法库和浏览器兼容性数据让浏览器碎片化不再头痛 
关于蓝牙设备的api地址：
uni-app官网 
大致实现思路：
1.在页面加载时，先判断本地缓存是否有历史连接蓝牙设备。
2.页面点击【打印】按钮时，最好是提前把此次需要打印的数据项先组装好。
3.点击打印后，先判断当前页面是否有历史连接蓝牙设备的信息：
如果有：直接连接蓝牙设备，进行打印；
如果没有：则以弹框的形式，搜索附近可用的蓝牙设备；
4.页面卸载时或者页面隐藏时，需要取消蓝牙连接并关闭蓝牙模块。
注：我这里是在当前页面弹框形式展示的蓝牙列表，大家可以根据自己实际项目需求来做出一些调整。
2.接下来直接上代码，以及依赖的js和弹框组件
弹框用的uni-popup 基础组件，如有需要，可以私信找我要。
页面蓝牙列表的视图view代码如下：
<template>
<view style="height: 100%;position: fixed;">
<button type="primary" style="width: 30%;" @tap="f_print()">打印</button>
<!-- 蓝牙配置弹窗 -->
<uni-popup :show="isShowSearchBle" position="middle" mode="fixed">
<view class="scrool-page">
<view class="search-part">
<button type="primary" style="" @tap="searchBlue()">搜索设备</button>
<button type="primary" style="" @tap="stopSearchBlue()">停止搜索</button>
</view>
<scroll-view v-if="deviceListLength>0" class="panel-scroll-box" scroll-y="true" style="width:320px;">
<view>
<view v-for="(item,index) in devices" :key="index" class="bluetooth-item" @click="onBlueChange(item,index)">
<view class="list-item-oneline">
<view class="list-text" style="flex: 1;">
<text>{{item.name?item.name:'未命名'}}</text>
</view>
<text>({{Math.max(0, item.rssi + 100)}}%)</text>
<text class="list-statue" style="margin-left: 30px;">{{item.status?'已连接':'未连接'}}</text>
</view>
</view>
</view>
</scroll-view>
<view v-show="deviceListLength==0" style="border-top: 1px solid #EEEEEE;margin-top: 10px;padding-top:10px;">
<image mode="aspectFit" src="/static/img/empty-icon.png"></image>
<view class="empty-text">~ 无可搜索到的设备 ~</view>
</view>
</view>
</uni-popup>
</view>
</template>
注： 当页面没有可用的蓝牙设备时，有一个背景图片，当然这个只是一个样式，不是关键的，但我还是尽量做到完善和完整度。empty-icon.png图片如下：有水印，如有需要原图，可以私信我，我会及时回复的。
页面引入弹框组件和相关的蓝牙打印的js文件：
<script>
import * as Common from "@/common/util.js"
import {
wxAsyncPromise ,debounce,catchToast,
getDeviceCharacteristics,
sendDataToDevice,
printCommand,LAST_CONNECTED_DEVICE
} from '../bluetooth/bluetoolth.js';
import GBK from '../bluetooth/gbk.js';
import uniPopup from '@/components/uni-popup.vue'
export default {
components: {
uniPopup
},
data() {
return {
/* 蓝牙打印相关参数-start */
isShowSearchBle:false,//是否显示蓝牙设备列表
devices: [],//搜索到的附近蓝牙设备列表//{"name":"T5810000","devId":"UUUUUUUU","rssi":-20,"status":false}
deviceName: '',//已连接或已选择的蓝牙设备名称
deviceId: '',//已连接或已选择的蓝牙设备ID
services:[],//蓝牙设备所有服务
character:[],
blueToothConnected:false,//是否已经连接
blueToothPrintData:{},//传输给蓝牙设备的数据
/* 蓝牙打印相关参数-end */
}
},
computed: {
//计算蓝牙设备列表长度
deviceListLength() {
return this.devices.length;
}
},
onShow() {
console.log(" 页面onShow");
let lastDevice = wx.getStorageSync(LAST_CONNECTED_DEVICE);
console.log("历史连接蓝牙设备:"+lastDevice);
if(Common.isExist(lastDevice)){
this.deviceId = lastDevice.split("&")[0];
this.deviceName = lastDevice.split("&")[1];
}
},
onHide() {
console.log(" 页面onHide");
//取消蓝牙连接并关闭蓝牙模块
wxAsyncPromise('closeBLEConnection', {
deviceId: this.deviceId,
}).finally((res) => {
wxAsyncPromise('closeBluetoothAdapter');
});
},
onLoad(e) {
let lastDevice = wx.getStorageSync(LAST_CONNECTED_DEVICE);
console.log("历史连接蓝牙设备:"+lastDevice);
if(Common.isExist(lastDevice)){
this.deviceId = lastDevice.split("&")[0];
this.deviceName = lastDevice.split("&")[1];
}
},
onUnload() {
//取消蓝牙连接并关闭蓝牙模块
wxAsyncPromise('closeBLEConnection', {
deviceId: this.deviceId,
}).finally((res) => {
wxAsyncPromise('closeBluetoothAdapter');
});
},
</script>
此处我只列出，当前与蓝牙打印相关的js文件：
1.
util.js 文件内容如下：根据自己实际需求决定是否引用
// alert提示
function alert (msg) {
alert_duration(msg,2000);
}
function alert_duration (msg, duration) {
if(!isExist(duration)){
duration = 3000;
}
uni.showToast({
title: msg,
icon: "none",
position: 'bottom',
duration: duration
});
}
//判断字符串是否存在
function isExist (str) {
if (str !== null && str !== "undefined" && str !== "" && typeof str != "undefined" && !(typeof (str) == "string" &&
str
.split(" ").join("").length == 0)) {
return true;
} else {
return false;
}
}
//转换日期格式(时间戳转换为datetime格式)
function changeDateFormat(cellval, hms) {
var dateVal = cellval + "";
if (cellval != null) {
var date = new Date(parseInt(dateVal.replace("/Date(", "").replace(")/", ""), 10));
var month = date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1;
var currentDate = date.getDate() < 10 ? "0" + date.getDate() : date.getDate();
var hours = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();
var minutes = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();
var seconds = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();
if(hms){
return date.getFullYear() + "-" + month + "-" + currentDate + " " + hours + ":" + minutes + ":" + seconds;
}else{
return date.getFullYear() + "-" + month + "-" + currentDate;
}
}
}
//计算字符长度（一个汉字2个字符）
function calculateStrLengh(str){
var len=0;
if(!isExist(str)){
return 0;
}
for (var i=0; i<str.length; i++) {
var c = str.charCodeAt(i);
//单字节加1
if ((c >= 0x0001 && c <= 0x007e) || (0xff60<=c && c<=0xff9f)) {
len++;
}
else {
len+=2;
}
}
return len;
}
// 声明
module.exports = {
isExist,
alert,
alert_duration,
changeDateFormat,
calculateStrLengh
}
2.
分别是蓝牙设备相关的方法和中文编码js文件，截图中是我的文件在项目中的目录位置
bluetoolth.js
/*
* @Author: zyf
* @Date: 2022年2月18日12:30:21
* @LastEditors: zyf
* @LastEditTime: 2022年2月18日12:30:21
* @Description: file content
*/
/**
*
*
* @param {string} name 微信api的名称 ，如 wxAsyncPromise("getSystemInfo",options)
* @param {object} options 除了success 和 fail 的其他参数
* @returns
*/
export function wxAsyncPromise(name, options) {
return new Promise((resolve, reject) => {
wx[name]({
...(options || {}),
success: function(res) {
resolve(res);
},
fail: function(res) {
reject(res);
},
});
});
}
export function debounce(func, wait) {
let timer = null;
return function(opt) {
clearTimeout(timer);
timer = setTimeout(() => {
func && func.call(this, opt);
}, wait || 60);
};
}
//微信小程序向蓝牙打印机发送数据进行打印的坑：
//小程序api向蓝牙打印机发送数据打印，发送的任何内容都应该要转成二进制数据，而且蓝牙打印的文本编码是GBK的，发送中文需转成GBK编码再转成二进制数据发送
//发送打印机指令也要转成二进制数据发送
//蓝牙打印机一次接收的二级制数据有限制，不同的系统不同的蓝牙设备限制可能不同，微信建议一次20个字节，需做递归分包发送
//发送完要打印的内容后，一定要发送一个打印的指令才能顺利打印 （有些指令就不需要）
//一、初始化蓝牙、开始检索蓝牙设备
export function openBlue() {
return wxAsyncPromise('openBluetoothAdapter').then((res) => {
console.log('初始化蓝牙成功', res);
return wxAsyncPromise('startBluetoothDevicesDiscovery').then((res) => {
console.log('正在搜寻蓝牙设备', res);
});
});
}
//二、
/**
*
*
* @export
* @param {function} getDevices wx.getBluetoothDevices的监听回调函数
*/
export function onfindBlueDevices(getDevices) {
//监听寻找到新设备的事件
wx.onBluetoothDeviceFound(function(devices) {
//获取在蓝牙模块生效期间所有已发现的蓝牙设备
wxAsyncPromise('getBluetoothDevices').then((res) => {
getDevices && getDevices(res.devices);
});
});
}
//三、连接蓝牙设备
// wxAsyncPromise("createBLEConnection",{deviceId:""}).then(res=>{
//连接成功可选择停止搜索蓝牙
// wxAsyncPromise("stopBluetoothDevicesDiscovery").then()
// }).catch(res=>{}).finally(()=>{})
//四、连接成功后， 获取蓝牙设备的service服务
// wxAsyncPromise("getBLEDeviceServices",{deviceId:""}).then(res=>{})
//五、获取的service服务可能有多个，递归获取特征值（最后要用的是能读，能写，能监听的那个值的uuid作为特征值id）
/**
*
*
* @export
* @param {number} deviceId 蓝牙设备id
* @param {array} services wxAsyncPromise("getBLEDeviceServices",{deviceId:""}).then(res=>{})获取的res.services
* @param {function} success 成功取得有用特征值uuid的回调函数
*/
export function getDeviceCharacteristics(deviceId, services = [], success, fail) {
services = services.slice(0);
if (services.length) {
const serviceId = services.shift().uuid;
wxAsyncPromise('getBLEDeviceCharacteristics', {
deviceId,
serviceId,
})
.then((res) => {
console.log('getBLEDeviceCharacteristics', deviceId, serviceId, res);
let finished = false;
let write = false;
let notify = false;
let indicate = false;
for (var i = 0; i < res.characteristics.length; i++) {
if (!notify) {
notify = res.characteristics[i].properties.notify;
}
// if (!indicate) {
// indicate = res.characteristics[i].properties.indicate;
// }
if (!write) {
write = res.characteristics[i].properties.write;
}
if ( write) {
/* 获取蓝牙特征值uuid */
success &&
success({
serviceId,
characteristicId: res.characteristics[i].uuid,
});
finished = true;
break;
}
}
if (!finished) {
getDeviceCharacteristics(deviceId, services, success, fail);
}
})
.catch((res) => {
getDeviceCharacteristics(deviceId, services, success, fail);
});
} else {
fail && fail();
}
}
//六、启动notify 蓝牙监听功能 然后使用 wx.onBLECharacteristicValueChange用来监听蓝牙设备传递数据
/**
*
*
* @export
* @param {object} options
* {
deviceId,//蓝牙设备id
serviceId,//服务id
characteristicId,//可用特征值uuid
}
* @param {function} onChange 监听蓝牙设备传递数据回调函数
*/
export function onBLECharacteristicValueChange(options, onChange = function() {}) {
wxAsyncPromise('notifyBLECharacteristicValueChange', {
state: true,
...options,
}).then((res) => {
wx.onBLECharacteristicValueChange(onChange);
});
}
//七、发送数据(递归分包发送)
/**
*
*
* @export
* @param {object} options
* {
deviceId,
serviceId,
characteristicId,
value [ArrayBuffer],
lasterSuccess,
}
*/
export function sendDataToDevice(options) {
let byteLength = options.value.byteLength;
//这里默认一次20个字节发送
const speed = options.onceByleLength || 20;
if (byteLength > 0) {
wxAsyncPromise('writeBLECharacteristicValue', {
...options,
value: options.value.slice(0, byteLength > speed ? speed : byteLength),
})
.then((res) => {
if (byteLength > speed) {
sendDataToDevice({
...options,
value: options.value.slice(speed, byteLength),
});
} else {
options.lasterSuccess && options.lasterSuccess();
}
})
.catch((res) => {
console.log("发送数据失败"+res);
wx.hideLoading();
catchToast(res);
});
}
}
export function charToArrayBuffer(str) {
var out = new ArrayBuffer(str.length);
var uint8 = new Uint8Array(out);
var strs = str.split('');
for (var i = 0; i < strs.length; i++) {
uint8[i] = strs[i].charCodeAt();
}
return uint8;
}
export function charToArray(str) {
var arr = [];
var strs = str.split('');
for (var i = 0; i < strs.length; i++) {
arr[i] = strs[i].charCodeAt();
}
return arr;
}
//打印二维码
/**
*
*
* @export
* @param {object} options
* {
deviceId,
serviceId,
characteristicId,
value,//ArrayBuffer:二维码的数据
}
*/
export function printQR(options) {
//打印二维码的十进制指令data：
let data = [29, 107, 97, 0, 1, options.value.byteLength, 0];
sendDataToDevice({
...options,
value: new Uint8Array(data).buffer,
lasterSuccess: () => {
//指令发送成功后，发送二维码的数据
sendDataToDevice(options);
},
});
}
function grayPixle(pix) {
return pix[0] * 0.299 + pix[1] * 0.587 + pix[2] * 0.114;
}
export function overwriteImageData(data) {
let sendWidth = data.width,
sendHeight = data.height;
const threshold = data.threshold || 180;
let sendImageData = new ArrayBuffer((sendWidth * sendHeight) / 8);
sendImageData = new Uint8Array(sendImageData);
let pix = data.imageData;
const part = [];
let index = 0;
for (let i = 0; i < pix.length; i += 32) {
//横向每8个像素点组成一个字节（8位二进制数）。
for (let k = 0; k < 8; k++) {
const grayPixle1 = grayPixle(pix.slice(i + k * 4, i + k * 4 + (4 - 1)));
//阈值调整
if (grayPixle1 > threshold) {
//灰度值大于threshold位 白色 为第k位0不打印
part[k] = 0;
} else {
part[k] = 1;
}
}
let temp = 0;
for (let a = 0; a < part.length; a++) {
temp += part[a] * Math.pow(2, part.length - 1 - a);
}
//开始不明白以下算法什么意思，了解了字节才知道，一个字节是8位的二进制数，part这个数组存的0和1就是二进制的0和1，传输到打印的位图数据的一个字节是0-255之间的十进制数，以下是用权相加法转十进制数，理解了这个就用上面的for循环替代了
// const temp =
// part[0] * 128 +
// part[1] * 64 +
// part[2] * 32 +
// part[3] * 16 +
// part[4] * 8 +
// part[5] * 4 +
// part[6] * 2 +
// part[7] * 1;
sendImageData[index++] = temp;
}
return {
array: Array.from(sendImageData),
width: sendWidth / 8,
height: sendHeight,
};
}
/**
* printImage
* @param {object} opt
* {
deviceId,//蓝牙设备id
serviceId,//服务id
characteristicId,//可用特征值uuid
lasterSuccess , //最后完成的回调
}
*/
// export function printImage(opt = {}, imageInfo = {}) {
// let arr = imageInfo.array,
// width = imageInfo.width,
// height = imageInfo.height;
// const writeArray = [];
// const xl = width % 256;
// const xh = width / 256;
// const hl = height % 256;
// const hh = height / 256;
// //分行发送图片数据,用的十进制指令
// const command = [29, 118, 48, 0, xl, xh, hl, hh];
// // for (let i = 0; i < arr.length / width; i++) {
// // const subArr = arr.slice(i * width, i * width + width);
// // const tempArr = command.concat(subArr);
// // writeArray.push(new Uint8Array(tempArr));
// // }
// const tempArr = command.concat(arr);
// writeArray.push(new Uint8Array(tempArr));
// const print = (options, writeArray) => {
// if (writeArray.length) {
// sendDataToDevice({
// ...options,
// value: writeArray.shift().buffer,
// lasterSuccess: () => {
// if (writeArray.length) {
// print(options, writeArray);
// } else {
// options.lasterSuccess && options.lasterSuccess();
// }
// },
// });
// }
// };
// print(opt, writeArray);
// }
export const LAST_CONNECTED_DEVICE = 'last_connected_device';
export const printCommand = {
left: [27, 97, 0], //居左
center: [27, 97, 1], //居中
right: [27, 97, 2], //居右
clear: [27, 64], //初始化
enter: [10],
};
export function printImage(opt = {}, imageInfo = {}) {
const { printAlign = 'left' } = opt;
let arr = imageInfo.array,
width = imageInfo.width;
const writeArray = [];
const xl = width % 256;
const xh = width / 256;
//分行发送图片数据
const command = []
.concat(printCommand.clear)
.concat(printCommand[printAlign])
.concat([29, 118, 48, 0, xl, xh, 1, 0]);
for (let i = 0; i < arr.length / width; i++) {
const subArr = arr.slice(i * width, i * width + width);
const tempArr = command.concat(subArr);
writeArray.push(new Uint8Array(tempArr));
}
const len = writeArray.length;
const print = (options, writeArray) => {
if (writeArray.length) {
sendDataToDevice({
...options,
value: writeArray.shift().buffer,
lasterSuccess: () => {
options.onProgress && options.onProgress(Math.floor(((len - writeArray.length) / len) * 100));
if (writeArray.length) {
print(options, writeArray);
} else {
options.lasterSuccess && options.lasterSuccess();
}
},
});
}
};
print(opt, writeArray);
}
/**
* 蓝牙设备异常信息
*/
export const errMsg = {
10000: '未初始化蓝牙模块',
10001: '蓝牙未打开',
10002: '没有找到指定设备',
10003: '连接失败',
10004: '没有找到指定服务',
10005: '没有找到指定特征值',
10006: '当前连接已断开',
10007: '当前特征值不支持此操作',
10008: '系统上报异常',
10009: '系统版本低于 4.3 不支持BLE',
10012: '连接超时',
10013: '连接 deviceId 为空或者是格式不正确'
};
/**
* toast显示捕获的蓝牙异常
*/
export function catchToast(err) {
let coode = err.errCode ? err.errCode.toString() : '';
let msg = errMsg[coode];
if(msg==undefined||msg==null || msg==""){
msg=err.errMsg;
}
wx.showToast({
title: msg || coode,
icon: 'none',
position: 'bottom',
duration: 3000
});
}
/*****CPCL指令接口****/
gbk.js文件内容如下：
/*!
* gbk.js v0.2.4
* Homepage https://github.com/cnwhy/GBK.js
* License MIT
*/
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*95)B?*1!N]dtpux} *2)*)O**u*+!KS *-:*.5+1!VR *Xs*Y!+;8X *X!gm *U!RT *c!w}{| *d8+(!;<%~ +)!&'%A *d!65D=CQRFHM`Ydaevw~ *e!()*0/5 *U`+0u*Y_*Z!9S *[!N^ *Y!\\fcak}~ *Z!(, *Y!uv *Z)*Ym*Z!:EF1GI2WKbkmz|q} *[!/5.*2&>67FG?ekqdiz *\\!+0,8: *V!*4<7JF )?=*N!PXTV +)!BC%~ +*!&'%H *N!_ei *O_*R<*u>*t!-73JELSRnqt *u)+3!loq%vx +2!CPR *s!VYZko )sM*s}*g!Ww *h8*iU*j(*k/*jM*l!Jw ++!369%< )zB++!?BD%FHINOR%WY%]_abd%kn%qx%{~ +,&+*!IJ%~ ++!&'%/12478=>@CGJ%MQ^`cmr%v|} +,!,-56;<'%+.%02%478:= *u!gp|} *v!&A=5DF *~!{z +&(+0O+&!'+-2163<=B +'!][_a`ei *yo*z!;\\ *{!*) +&!PRW`\\l^jy +'!'+7; +1![\\ *-.+0!y~ +1!&)0 *k;+1!;=y%{~} +2!'.,*/4gqt~| +3!)*0 +,!>?%~ +-!&'%~ +.!&'%~ +/!&'%ntw~ +0!'+237DGI%KMPTV%Y\\efik%twxz%} +1!'(*%/2%:<>%CE%QS%UWXZ]%ac%fh%jnpqs%uwx| +2!&()+-0%35%=?BD%OQTVWY%[]_%dfh%prsu%{} +3!&(+%/1%;>%jmny%~ +4!&'%+/%14%8 .*f.+!Zv .,!oy .-!;<%>@BCGN%PRSV%X -R!XY%~ -S!&'%N")),t(e)});
打印相关的方法：
只要连接成功时，就直接传输数据给打印机。
methods: {
//打印
f_print(){
this.sfShowTc=false;
if (!Common.isExist(this.deviceId)) {
this.openBlueTooth();
this.isShowSearchBle=true;
return;
}else{
console.log("有历史设备信息直接连接");
this.createBLEConnectionWithDeviceId();
}
},
// 小程序在之前已有搜索过某个蓝牙设备，并成功建立连接，可直接传入之前搜索获取的 deviceId 直接尝试连接该设备
createBLEConnectionWithDeviceId(){
if (!Common.isExist(this.deviceId)) {
return
}
uni.openBluetoothAdapter({
success:(res) => {
console.log("初始化蓝牙设备模块:"+JSON.stringify(res));
if(res.errno==0){
this.connectBlue(this.deviceId,this.deviceName,null);
}else{
Common.alert_duration(res.errMsg);
}
},
fail: (res) => {
console.log("初始化蓝牙设备模块失败:"+JSON.stringify(res));
catchToast(res);
wx.onBluetoothAdapterStateChange((res) => {
console.log('onBluetoothAdapterStateChange', res)
if (res.available) {
// 取消监听
wx.onBluetoothAdapterStateChange(() => {
});
this.connectBlue(this.deviceId,this.deviceName,null);
}
})
}
});
},
//初始化蓝牙
openBlueTooth(){
if (!wx.openBluetoothAdapter) {
wx.showModal({
title: '提示',
content: '当前微信版本过低，无法使用该功能，请升级到最新微信版本后重试。'
})
return
}
wx.openBluetoothAdapter({
success:(res) => {
console.log("初始化蓝牙设备模块:"+JSON.stringify(res));
if(res.errno==0){
this.searchBlueToothDiscovery();
}else{
Common.alert_duration(res.errMsg);
}
},
fail: (res) => {
console.log("初始化蓝牙设备模块失败:"+JSON.stringify(res));
catchToast(res);
wx.onBluetoothAdapterStateChange((res) => {
console.log('onBluetoothAdapterStateChange', res)
if (res.available) {
// 取消监听，否则stopBluetoothDevicesDiscovery后仍会继续触发onBluetoothAdapterStateChange，
// 导致再次调用startBluetoothDevicesDiscovery
wx.onBluetoothAdapterStateChange(() => {
});
this.searchBlueToothDiscovery();
}
})
}
});
wx.onBLEConnectionStateChange((res) => {
// 该方法回调中可以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.blueToothConnected = res.connected;
if (!res.connected) {
wx.showModal({
title: '提示',
content: '蓝牙连接已断开',
showCancel: false
});
}
});
},
//搜寻附近的蓝牙外围设备
searchBlueToothDiscovery(){
uni.startBluetoothDevicesDiscovery({
success:(res) => {
console.log("搜寻附近的蓝牙外围设备成功:"+JSON.stringify(res));
if(res.errno==0){
wx.onBluetoothDeviceFound(this.onFoundDevice);
}else{
catchToast(res);
}
},
fail: (res) => {
console.log("搜寻附近的蓝牙外围设备失败:"+JSON.stringify(res));
catchToast(res);
}
});
},
//监听寻找到新设备的事件
onBlueToothDeviceFound(){
uni.onBluetoothDeviceFound(function (devices) {
this.getBluetoothDevices();
})
},
//获取在蓝牙模块生效期间所有已发现的蓝牙设备。包括已经和本机处于连接状态的设备
getBluetoothDevices(){
uni.getBluetoothDevices({
success:(res) => {
console.log("获取附近的蓝牙外围设备成功:"+JSON.stringify(res));
if(res.errno==0){
this.devices=this.getNewDevicesList(res.devices);
}else{
catchToast(res);
}
},
fail: (res) => {
console.log("获取附近的蓝牙外围设备失败:"+JSON.stringify(res));
catchToast(res);
}
});
},
//获取设备列表
getNewDevicesList(devices) {
console.log("获取新的设备列表");
const ids = [];
//过滤无用蓝牙设备
const devs = devices
.filter((item) => !(item.RSSI > 0 || item.name.indexOf("T581")<0))
.map((item) => {
ids.push(item.deviceId);
return {
rssi: item.RSSI,
name: item.name,
devId: item.deviceId,
status:false
};
});
//过滤重复
const filterId = [...new Set(ids)];
const newDevices = [];
while (filterId.length) {
const id = filterId.shift();
for (let index = 0; index < devs.length; index++) {
const item = devs[index];
if (item.devId === id) {
newDevices.push(item);
break;
}
}
}
return newDevices;
},
onFoundDevice: debounce(function(devices) {
//获取搜寻的所有设备
console.log("获取搜寻的所有设备");
wxAsyncPromise('getBluetoothDevices').then((res) => {
this.devices=this.getNewDevicesList(res.devices);
});
}, 60),
onSearchDeviceFound(pro) {
pro.then((res) => {
console.log('初始化蓝牙成功');
return wxAsyncPromise('startBluetoothDevicesDiscovery').then((res) => {
console.log('正在搜寻设备');
wx.showLoading({
title: '正在搜寻设备',
mask: false,
});
});
})
.then((res) => {
//监听寻找新设备
console.log("监听寻找新设备")
wx.onBluetoothDeviceFound(this.onFoundDevice);
})
.catch((res) => {
console.log("监听寻找新设备异常："+JSON.stringify(res));
catchToast(res);
wx.setStorageSync(LAST_CONNECTED_DEVICE,"");
this.deviceId="";
this.deviceName = "";
})
.finally(() => {
setTimeout(() => {
wx.hideToast();
}, 300);
// this.stopSearchBlue();
});
},
//重新搜索蓝牙设备
searchBlue() {
wxAsyncPromise('closeBLEConnection', {
deviceId: this.deviceId,
}).finally((res) => {
this.devices=[];
this.deviceId="";
this.deviceName="";
this.blueToothConnected=false;
wx.offBluetoothDeviceFound(this.onFoundDevice);
//停止搜寻蓝牙
wxAsyncPromise('stopBluetoothDevicesDiscovery').then(() => {
wx.getBluetoothAdapterState({
success: (res) => {
if (!res.available) {
//未打开蓝牙
} else if (!res.discovering) {
//没有在搜寻蓝牙情况
this.onSearchDeviceFound(Promise.resolve());
}
},
fail: (res) => {
if (res.errCode === 10000) {
this.openBlueTooth();
}
},
});
});
});
},
//停止搜索蓝牙设备
stopSearchBlue() {
console.log("停止搜索");
wxAsyncPromise('stopBluetoothDevicesDiscovery');
},
onBlueChange(e,index) {
const deviceId = e.devId;
// if (this.deviceId === deviceId) return;
this.deviceId="";
this.deviceName="";
this.blueToothConnected=false;
this.connectBlue(deviceId,e.name,index);
},
//连接蓝牙
connectBlue(deviceId,deviceName,index) {
wx.showLoading({
title: '正在连接'+deviceName,
mask: true,
});
wxAsyncPromise('createBLEConnection', { deviceId })
.then((res) => {
return wxAsyncPromise('getBLEDeviceServices', { deviceId });
})
.then((res) => {
console.log("获取蓝牙设备所有服务："+JSON.stringify(res.services));
this.services = res.services;
getDeviceCharacteristics(
deviceId,
[...this.services],
(character) => {
console.log("成功获取到特征值:"+JSON.stringify(character));
this.character = character;
this.deviceName= deviceName;
this.deviceId=deviceId;
this.blueToothConnected=true;
if(index!=null){
this.devices[index].status=true;
}
wx.setStorageSync(LAST_CONNECTED_DEVICE, this.deviceId+"&"+this.deviceName);
wx.hideLoading();
wx.offBluetoothDeviceFound(this.onFoundDevice);
wxAsyncPromise('stopBluetoothDevicesDiscovery');
// 延时调用
this.print();
},
(res) => {
console.log('获取设备特征值失败');
this.blueToothConnected=false;
Common.alert_duration("获取设备特征值失败");
wx.hideLoading();
this.isShowSearchBle=true;
},
);
})
.catch((res) => {
console.log('获取服务失败');
this.blueToothConnected=false;
Common.alert_duration("获取服务失败");
wx.hideLoading();
this.isShowSearchBle=true;
});
},
print: debounce(function() {
if (!Common.isExist(this.deviceId)) {
wx.showToast({
title: '未连接任何蓝牙设备',
icon: 'none',
});
return;
}
wx.showLoading({
title: '正在打印中......',
mask: true,
});
const opt = { deviceId: this.deviceId, ...this.character };
let _queue=[printCommand.clear];
let line = GBK.encode('-------------------------------\r\n');
let spaceStr = " ";
let shName= this.blueToothPrintData.shName;
let addressPhone=this.blueToothPrintData.xfSellerAddressPhone;
_queue.push.apply(_queue, printCommand.center);
console.log("开始组装打印数据")
_queue.push.apply(_queue, printCommand.enter);
_queue.push.apply(_queue, GBK.encode(shName+"\n"));
_queue.push.apply(_queue, printCommand.enter);
_queue.push.apply(_queue, line);
_queue.push.apply(_queue, printCommand.left);
_queue.push.apply(_queue, GBK.encode("消费单号："+this.blueToothPrintData.id+"\n"));
let currentTime1=Common.changeDateFormat(new Date().getTime(),true);
_queue.push.apply(_queue, GBK.encode("消费时间："+currentTime1+"\r\n"));
_queue.push.apply(_queue, line);
_queue.push.apply(_queue, GBK.encode('商品名称 数量 金额'));
_queue.push.apply(_queue, printCommand.enter);
let spList = this.selectSpArr;
let sumSpNum=0;
for (var i = 0; i < spList.length; i++) {
let spmcSpaceNum = 16-Common.calculateStrLengh(spList[i].spmc);
let spItemStr=spList[i].spmc;
for (var j = 0; j < spmcSpaceNum; j++) {
spItemStr += spaceStr;
}
spItemStr += parseFloat(spList[i].spnum).toFixed(2);
let spnumSpaceNum = 6-Common.calculateStrLengh(parseFloat(spList[i].spnum).toFixed(2));
for (var k = 0; k < spnumSpaceNum; k++) {
spItemStr += spaceStr;
}
let spjeSpaceNum = 9-Common.calculateStrLengh(parseFloat(spList[i].spSumMoney).toFixed(2));
for (var l = 0; l < spjeSpaceNum; l++) {
spItemStr += spaceStr;
}
spItemStr += parseFloat(spList[i].spSumMoney).toFixed(2);
_queue.push.apply(_queue, GBK.encode(spItemStr));
_queue.push.apply(_queue, printCommand.enter);
sumSpNum = sumSpNum + spList[i].spnum;
}
_queue.push.apply(_queue, line);
_queue.push.apply(_queue, GBK.encode("消费总计："+parseFloat(sumSpNum).toFixed(2)+"\r\n"));
_queue.push.apply(_queue, GBK.encode("消费金额："+parseFloat(this.blueToothPrintData.spjsHj).toFixed(2)+"\r\n"));
_queue.push.apply(_queue, GBK.encode("实付金额："+parseFloat(this.blueToothPrintData.actualAmount).toFixed(2)+"\r\n"));
_queue.push.apply(_queue, line);
_queue.push.apply(_queue, printCommand.enter);
_queue.push.apply(_queue, GBK.encode("地址："+this.blueToothPrintData.shdz+"\n"));
_queue.push.apply(_queue, printCommand.enter);
_queue.push.apply(_queue, GBK.encode("联系电话："+this.userInfo.username+"\n"));
_queue.push.apply(_queue, printCommand.enter);
_queue.push.apply(_queue, printCommand.center);
_queue.push.apply(_queue, GBK.encode("扫码开票\n"));
_queue.push.apply(_queue, [29, 119, 6]);//放大6倍二维码
let qrContent="https://ksp.tbzhchina.com/invoiceadd?orderId=" + this.blueToothPrintData.id + "&sfJyToken=false";
let qrCode1 = [29, 107, 97, 5, 1, new Uint8Array(GBK.encode(qrContent)).buffer.byteLength, 0];
_queue.push.apply(_queue, qrCode1);
_queue.push.apply(_queue, GBK.encode(qrContent));
_queue.push.apply(_queue, GBK.encode("感谢您的惠顾"));
_queue.push.apply(_queue, printCommand.enter);
_queue.push.apply(_queue, line);
_queue.push.apply(_queue, GBK.encode("快闪票\r\n"));
_queue.push.apply(_queue, printCommand.enter);
_queue.push.apply(_queue, GBK.encode("请在三日内开具发票，谢谢!\r\n"));
_queue.push.apply(_queue, printCommand.enter);
_queue.push.apply(_queue, printCommand.enter);
_queue.push.apply(_queue, GBK.encode(" \r\n"));
_queue.push.apply(_queue, line);
console.log("开始发送打印数据")
sendDataToDevice({
...opt,
value: new Uint8Array(_queue).buffer,
lasterSuccess: () => {
wx.hideLoading();
console.log("打印完成!")
this.orderId="";
this.spjeHj=0;
this.spseHj=0;
this.sumSpMoney="0";
this.selectSpArr = [];
this.isShowSearchBle=false;
Common.alert("打印成功!");
},
});
}, 60),
}注意点：getNewDevicesList 方法中，此处我们用的设备名称是 T581 开头的，所以我用名称过滤无用的设备信息，第二步根据设备ID过滤重复设备。
最后页面样式部分如下：
<style>
/*蓝牙配置弹窗-start*/
.scrool-page {
display: flex;
flex-direction: column;
width: 100%;
height: 100%;
}
.panel-scroll-box {
height: 85%;
max-height: 350px;
flex: 1;
position: relative;
margin-top: 10px;
border-top: 1px solid #EEEEEE;
}
.bluetooth-item{
border-bottom: 1px solid #EEEEEE;
}
.bluetooth-item:last-child{
border-bottom: 0px solid #EEEEEE;
}
.empty-icon{
margin-top: 20px;
margin-bottom: 26upx;
}
.empty-text{
width: 100%;
line-height: 50upx;
font-size: 30upx;
text-align: center;
color: #999999;
}
/* 列表--一行的样式 */
.list-item-oneline {
width: 100%;
background-color: #FFFFFF;
margin-bottom: 10px;
height: 50px;
display: flex;
flex-direction: row;
justify-content: space-between;
align-items: center;
padding: 0 15px;
box-sizing: border-box;
}
.list-item-oneline .list-text {
font-size: 16px;
height: 20px;
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
flex: 1;
}
.list-item-oneline .list-statue {
font-size: 12px;
border: 1px solid #0faeff;
padding: 1px 4px;
border-radius: 3px;
color: #0faeff;
margin-left: 6px;
}
/*蓝牙配置弹窗-end*/
</style>
附带页面弹框效果图如下，第一个为没有可用设备时，第二个是有可用设备时：
如有问题，还请各位大佬多多指教，我是一名做后端 Java开发的程序猿，前端难免会有疏漏的部分。另外，有吉他或者民谣爱好者，可以关注我的微信公众号@民谣嗑学家，可以微信搜索：民谣嗑学家，帮我点个免费的关注，我是一名爱生活，爱代码，爱交朋友的热血青年，希望我们能够共同进步，共同成长。
目录
1.基础开发环境，所用到的 Api 以及实现的思路。
应用场景：
HbuilderX开发工具：
关于蓝牙设备的api地址：
大致实现思路：
1.在页面加载时，先判断本地缓存是否有历史连接蓝牙设备。
2.页面点击【打印】按钮时，最好是提前把此次需要打印的数据项先组装好。
3.点击打印后，先判断当前页面是否有历史连接蓝牙设备的信息：
4.页面卸载时或者页面隐藏时，需要取消蓝牙连接并关闭蓝牙模块。
2.接下来直接上代码，以及依赖的js和弹框组件
弹框用的uni-popup 基础组件，如有需要，可以私信找我要。
页面蓝牙列表的视图view代码如下：
页面引入弹框组件和相关的蓝牙打印的js文件：
此处我只列出，当前与蓝牙打印相关的js文件：
1.
2.
打印相关的方法：