查资料
就在上周,我司的产品经理甩给了我一个打印机,顺便给了我一个安卓和IOS的SDK(心里一万只草泥马,我写的是小程序你给我安卓的SDK干嘛??)
说在小程序里入库时加个打印标签的功能 .我嘴角微微上扬,这对面向Google和百度的我来说并不是什么难事.于是确定好了需求细节后就开始着手开始捣鼓了.
一开始搜索了相关的文章,下载了几个demo,结果都是不行,控制台没报错,当时打印机就是没反应,于是我又开始了我的google百度之旅. 后来我发现demo打印不出东西完全是因为打印机的问题,产品经理给的打印机型号是精臣的B3S系列, 我去问了天猫的客服,客服又让我填了一个需求反馈表单,第二天他们的技术人员会来联系我.
时间来到第二天,精臣的技术人员联系到我, 我说我需要做一个小程序的蓝牙打印功能, 技术人员说他们公司目前出的打印机机型,都是不支持指令打印的,只目前打印传输的是图片 . 而巧的是小程序的低功耗蓝牙对传输速率有限制, 所以只支持指令打印.
你说起不起,不懂行的产品经理,给了个安卓的SDK就算了,还给了个不支持小程序低功耗蓝牙打印的打印机.
既然他们的产品不支持, 那就换一个打印机, 于是我又在天猫探索,发现了一款便携式标签打印机是支持小程序低功耗蓝牙打印的. 我买的这款是佳博M322 . 然后用demo测试了一下 , 结果不出我所料,是没问题的.
github上放了两个demo,一个是uniapp的,一个是原生的.因为我是用uniapp写的,本人又比较懒,直接把uniapp的拉过来了. 需要的自取 .
实现
使用了vue的mixin:
var tsc = require('./tsc.js')
var esc = require('./esc.js')
import {mapGetters,mapMutations} from 'vuex'
import {SET_CONNECTBLUETOOTH,SET_CURRPRINTER} from '../../../store/mutation-types.js'
import {checkErr} from '../Utils/public.js'
export default {
data() {
return {
devices: [],
currDev: null,
connId: '',
piaojuText:'',
}
},
computed:{
...mapGetters(['isConnectBluetooth','currPrinter'])
},
methods: {
...mapMutations({
setConnectBlue:SET_CONNECTBLUETOOTH,
setCurrentPrinter:SET_CURRPRINTER
}),
destroyed: function() {
console.log("destroyed----------")
if (this.connId != '') {
uni.closeBLEConnection({
deviceId: this.connId,
success(res) {
console.log(res)
}
})
}
},
searchBle() {
var that = this
console.log("initBule")
uni.showLoading({
title:'搜索蓝牙中'
})
uni.openBluetoothAdapter({//初始化蓝牙模块
success(res) {
console.log("打开 蓝牙模块")
console.log(res)
that.onDevice()//监听寻找到新设备的事件
uni.getBluetoothAdapterState({//获取本机蓝牙适配器状态
success: function(res) {
console.log(res)
if (res.available) {
if (res.discovering) {
uni.hideLoading()
that.stopFindBule()
}
//搜索蓝牙
//开始搜寻附近的蓝牙外围设备
console.log("开始搜寻附近的蓝牙外围设备")
uni.startBluetoothDevicesDiscovery({
success(res) {
console.log(res)
setTimeout(()=>{
console.log('10秒倒计时')
that.stopFindBule()
let printer = that.devices.find(item=>item.deviceId === that.lastPrinter.deviceId)
if(!printer&&that.connectStatus){
uni.showModal({
title: '提示',
showCancel: false,
confirmText: '确定',
content: '没找到指定打印机',
});
}
},10000)
}
})
} else {
uni.hideLoading()
console.log('本机蓝牙不可用')
}
},
})
}
})
},
onDevice(){
console.log("监听寻找到新设备的事件---------------")
var that = this
//监听寻找到新设备的事件
uni.onBluetoothDeviceFound(function(devices) {
console.log('--------------new-----------------------'+JSON.stringify(devices))
var re = JSON.parse(JSON.stringify(devices))
console.log(re.devices[0].name + " " + re.devices[0].deviceId)
let name = re.devices[0].name
if (name != "未知设备") {
let deviceId = re.devices[0].deviceId
that.devices.push({
name: name,
deviceId: deviceId,
services: []
})
}
})
},
stopFindBule() {
console.log("停止搜寻附近的蓝牙外围设备---------------")
uni.stopBluetoothDevicesDiscovery({
success(res) {
console.log(res)
}
})
},
//连接
onConn(item) {
var that = this
uni.showLoading({
title:'连接蓝牙中'
})
console.log("连接蓝牙---------------" + item.deviceId)
let deviceId = item.deviceId
uni.createBLEConnection({//连接低功耗蓝牙设备
deviceId: deviceId,
complete(res) {
console.log(res)
if (res.errMsg == "createBLEConnection:ok") {
console.log("连接蓝牙-[" + item.name + "]--成功")
that.connId = deviceId;
setTimeout(function() {
that.getBLEServices(deviceId)//获取蓝牙设备所有服务(service)
console.log(item,'lastPrinter存到本地')
that.currDev = item
that.setCurrentPrinter(item)
uni.setStorageSync('lastPrinter',item)
}, 2000)
} else {
uni.hideLoading()
console.log(res)
}
//连接成功 关闭搜索
that.stopFindBule()
},
})
},
getBLEServices(_deviceId) {
var that = this;
let deviceId = _deviceId
console.log("获取蓝牙设备所有服务(service)。---------------")
uni.showLoading({
title:'获取蓝牙设备服务中.',
icon:'none'
})
uni.getBLEDeviceServices({
// 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
deviceId: deviceId,
complete(res) {
console.log(res)
let serviceId = ""
for (var s = 0; s < res.services.length; s++) {
console.log(res.services[s].uuid)
let serviceId = res.services[s].uuid
uni.getBLEDeviceCharacteristics({//获取蓝牙设备某个服务中所有特征值(characteristic)
// 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
deviceId: deviceId,
// 这里的 serviceId 需要在 getBLEDeviceServices 接口中获取
serviceId: serviceId,
success(res) {
var re = JSON.parse(JSON.stringify(res))
console.log('deviceId = [' + deviceId + '] serviceId = [' + serviceId + ']')
for (var c = 0; c < re.characteristics.length; c++) {
if (re.characteristics[c].properties.write == true) {
let uuid = re.characteristics[c].uuid
console.log(' deviceId = [' + deviceId + '] serviceId = [' + serviceId + '] characteristics=[' +
uuid)
for (var index in that.devices) {
if (that.devices[index].deviceId == deviceId) {
that.devices[index].services.push({
serviceId: serviceId,
characteristicId: uuid
})
break
}
}
console.log(JSON.stringify(that.devices))
}
}
}
})
}
uni.hideLoading()
that.setConnectBlue(true)
uni.showToast({
title:"连接蓝牙成功",
icon:'success'
})
},
fail(res) {
that.setConnectBlue(false)
let msg = checkErr(res.errCode)
uni.showModal({
title: '提示',
showCancel: false,
confirmText: '确定',
content: `${msg}`,
});
uni.hideLoading()
},
})
},
senBlData(deviceId, serviceId, characteristicId,uint8Array) {
console.log('************deviceId = [' + deviceId + '] serviceId = [' + serviceId + '] characteristics=[' +characteristicId+ "]")
var uint8Buf = Array.from(uint8Array);
function split_array(datas,size){
var result = {};
var j = 0
for (var i = 0; i < datas.length; i += size) {
result[j] = datas.slice(i, i + size)
j++
}
console.log(result)
return result
}
var sendloop = split_array(uint8Buf, 20);
// console.log(sendloop.length)
return new Promise((resolve,reject)=>{
function realWriteData(sendloop, i) {
var data = sendloop[i]
if(typeof(data) == "undefined"){
resolve('单次打印结束')
return
}
console.log("第【" + i + "】次写数据"+data)
var buffer = new ArrayBuffer(data.length)
var dataView = new DataView(buffer)
for (var j = 0; j < data.length; j++) {
dataView.setUint8(j, data[j]);
}
uni.writeBLECharacteristicValue({
deviceId,
serviceId,
characteristicId,
value: buffer,
success: (res)=>{
realWriteData(sendloop, i + 1);
},
fail:(err)=>{
let msg = checkErr(err.errCode)
uni.showModal({
title: '提示',
showCancel: false,
confirmText: '确定',
content: `${msg}`,
});
uni.hideLoading()
return
}
})
}
var i = 0;
realWriteData(sendloop, i)
})
},
senBleLabel(form) {
return new Promise((resolve,reject)=>{
//标签模式
uni.showLoading({
title:'标签打印中'
})
let deviceId = this.currPrinter.deviceId;
let serviceId = this.currPrinter.services[0].serviceId;
let characteristicId = this.currPrinter.services[0].characteristicId;
var command = tsc.jpPrinter.createNew()
// console.log(command)
if(this.ReagentPrintModel == '3'){
command.setSize(40, 30)
command.setGap(2)
command.setCls()
command.setText(16,8, "TSS16.BF2", 1, 1, `名称: ${form.CommonName}`)
command.setText(16,40, "TSS16.BF2", 1, 1, `纯度: ${form.Consistency} 规格: ${form.Model}`)
command.setBarCode(16, 72, "128M", 48, 1, 2,2,form.Barcode)
command.setText(16,176, "TSS16.BF2", 1, 1, '开瓶时间:')
command.setBar(96,192, 160, 2)
// command.setQR(16, 160, "L", 3, "A", "977767937@qq.com")
command.setPagePrint()
}else{
command.setSize(40, 30)
command.setGap(2)
command.setCls()
command.setText(16,8, "TSS16.BF2", 1, 1, `品名: ${form.CommonName}`)
command.setText(16,40, "TSS16.BF2", 1, 1, `位置: ${this.position}`)
command.setText(16,72, "TSS16.BF2", 1, 1, `规格: ${form.Model} 纯度: ${form.Consistency}`)
command.setBarCode(16, 104, "128M", 48, 1, 2,2,form.Barcode)
// command.setQR(16, 160, "L", 3, "A", "977767937@qq.com")
command.setPagePrint()
}
this.senBlData(deviceId, serviceId, characteristicId,command.getData()).then((res)=>{
// console.log(res)
uni.hideLoading()
resolve(res)
})
})
},
senBleLabel2(){
//票据模式
let deviceId = this.currPrinter.deviceId;
let serviceId = this.currPrinter.services[0].serviceId;
let characteristicId = this.currPrinter.services[0].characteristicId;
var command = esc.jpPrinter.createNew()
command.init()
command.setText(this.piaojuText);
command.setPrintAndFeedRow(1)
this.senBlData(deviceId, serviceId, characteristicId,command.getData())
}
}
}
页面:
async success2print(form){
console.log(form)
for(let i=0;i<form.length;i++){
console.log(`第${i+1}次打印`)
let res = await this.senBleLabel(form[i])
console.log(res)
}
uni.showToast({
title:'入库成功',
icon:'success'
})
},
原来的demo中是只能打印一次的,无法连续打印, 就将代码改了改,支持连续打印.
打印的核心函数就是senBleLabel和senBlData,其中senBleLabel是设置标签模版,senBlData定义数据,把数据分成最大长度为20的二进制数据.然后依次写入设备特征值.
模版设置
参考demo文件里的佳博标签打印机编程手册tspl v1.0.8, 值得一提的就是算好距离然后打印就完事了.
由于这台打印机的DPI为203(DPI可以在打印机的机身参数上面查看).
200DPI: 1mm = 8dots
command.setText(16,8, "TSS16.BF2", 1, 1, `名称: ${form.CommonName}`)
比如这一段是设置文字,16代表x轴16dots(2mm),y轴是8dots(1mm),TSS16.BF2是文字类型,具体参数可以去手册里查看,这里不多做解释,因为我自己也是看着手册来的:smile:
40mm×30mm的标签 dots尺寸就是, 320×240.
那支笔画一画一目了然.
最终打印出来的效果.各位可以根据自己的需求修改...
