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2023-04-23 15:45| 来源: 网络整理| 查看: 265

对于蓝牙有写入数据的话，需要时低功耗的蓝牙。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。

https://developers.weixin.qq.com/miniprogram/dev/api/device/bluetooth-ble/wx.writeBLECharacteristicValue.html

先搜索蓝牙设备

wxml

开始搜索 {{item.deviceId}} {{item.name}}

data: { list: [], services: [], serviceId: 0, writeCharacter: false, readCharacter: false, notifyCharacter: false, isScanning:false }, startSearch: function () { var that = this wx.openBluetoothAdapter({ success: function (res) { wx.getBluetoothAdapterState({ success: function (res) { if (res.available) { if (res.discovering) { wx.stopBluetoothDevicesDiscovery({ success: function (res) { console.log(res) } }) } that.checkPemission() } else { wx.showModal({ title: '提示', content: '本机蓝牙不可用', }) } }, }) }, fail: function () { wx.showModal({ title: '提示', content: '蓝牙初始化失败，请打开蓝牙', }) } }) }, checkPemission: function () { //android 6.0以上需授权地理位置权限 var that = this var platform = app.BLEInformation.platform if (platform == "ios") { app.globalData.platform = "ios" that.getBluetoothDevices() } else if (platform == "android") { app.globalData.platform = "android" console.log(app.getSystem().substring(app.getSystem().length - (app.getSystem().length - 8), app.getSystem().length - (app.getSystem().length - 8) + 1)) if (app.getSystem().substring(app.getSystem().length - (app.getSystem().length - 8), app.getSystem().length - (app.getSystem().length - 8) + 1) > 5) { wx.getSetting({ success: function (res) { console.log(res) if (!res.authSetting['scope.userLocation']) { wx.authorize({ scope: 'scope.userLocation', complete: function (res) { that.getBluetoothDevices() } }) } else { that.getBluetoothDevices() } } }) } } }, getBluetoothDevices: function () { //获取蓝牙设备信息 var that = this console.log("start search") wx.showLoading({ title: '正在加载', }) that.setData({ isScanning:true }) wx.startBluetoothDevicesDiscovery({ success: function (res) { console.log(res) setTimeout(function () { wx.getBluetoothDevices({ success: function (res) { var devices = [] var num = 0 for (var i = 0; i < res.devices.length; ++i) { if (res.devices[i].name != "未知设备") { devices[num] = res.devices[i] num++ } } that.setData({ list: devices, isScanning:false }) wx.hideLoading() wx.stopPullDownRefresh() }, }) }, 3000) }, }) }, bindViewTap: function (e) { var that = this wx.stopBluetoothDevicesDiscovery({ success: function (res) { console.log(res) }, }) that.setData({ serviceId: 0, writeCharacter: false, readCharacter: false, notifyCharacter: false }) console.log(e.currentTarget.dataset.title) wx.showLoading({ title: '正在连接', }) wx.createBLEConnection({ deviceId: e.currentTarget.dataset.title, success: function (res) { console.log(res) app.BLEInformation.deviceId = e.currentTarget.dataset.title that.getSeviceId() }, fail: function (e) { wx.showModal({ title: '提示', content: '连接失败', }) console.log(e) wx.hideLoading() }, complete: function (e) { console.log(e) } }) }, getSeviceId: function () { var that = this var platform = app.BLEInformation.platform console.log(app.BLEInformation.deviceId) wx.getBLEDeviceServices({ deviceId: app.BLEInformation.deviceId, success: function (res) { console.log(res) that.setData({ services: res.services }) that.getCharacteristics() }, fail: function (e) { console.log(e) }, complete: function (e) { console.log(e) } }) }, getCharacteristics: function () { var that = this var list = that.data.services var num = that.data.serviceId var write = that.data.writeCharacter var read = that.data.readCharacter var notify = that.data.notifyCharacter wx.getBLEDeviceCharacteristics({ deviceId: app.BLEInformation.deviceId, serviceId: list[num].uuid, success: function (res) { console.log(res) for (var i = 0; i < res.characteristics.length; ++i) { var properties = res.characteristics[i].properties var item = res.characteristics[i].uuid if (!notify) { if (properties.notify) { app.BLEInformation.notifyCharaterId = item app.BLEInformation.notifyServiceId = list[num].uuid notify = true } } if (!write) { if (properties.write) { app.BLEInformation.writeCharaterId = item app.BLEInformation.writeServiceId = list[num].uuid write = true } } if (!read) { if (properties.read) { app.BLEInformation.readCharaterId = item app.BLEInformation.readServiceId = list[num].uuid read = true } } } if (!write || !notify || !read) { num++ that.setData({ writeCharacter: write, readCharacter: read, notifyCharacter: notify, serviceId: num }) if(num == list.length){ wx.showModal({ title: '提示', content: '找不到该读写的特征值', }) }else{ that.getCharacteristics() } } else { that.openControl() } }, fail: function (e) { console.log(e) }, complete: function (e) { console.log("write:"+app.BLEInformation.writeCharaterId) console.log("read:"+app.BLEInformation.readCharaterId) console.log("notify:"+app.BLEInformation.notifyCharaterId) } }) }, openControl: function () { wx.navigateTo({ url: '../startPrint/startPrint', }) },然后打印

下面就是startPrint的代码 wxml

发送(票据可使用) 标签测试

下面是 js 的代码，首先是设置变量

data: { sendContent: "", looptime: 0, currentTime: 1, lastData: 0, oneTimeData: 0, returnResult: "returnResult", canvasWidth: 80, canvasHeight: 80, buffSize: [], buffIndex: 0, printNum: [], printNumIndex: 0, printerNum: 1, currentPrint: 1, isReceiptSend: false, isLabelSend: false },

command.setCls() ，需要设置这个，不然内容和上一次重复

onLoad: function(options) { var that = this; wx.notifyBLECharacteristicValueChange({ deviceId: app.BLEInformation.deviceId, serviceId: app.BLEInformation.notifyServiceId, characteristicId: app.BLEInformation.notifyCharaterId, state: true, success: function(res) { wx.onBLECharacteristicValueChange(function(r) { console.log(`characteristic ${r.characteristicId} has changed, now is ${r}`) }) }, fail: function(e) { console.log('fail', e) }, complete: function(e) { console.log('complete', e) } }) }, inputEvent: function(e) { this.setData({ sendContent: e.detail.value }) console.log('sendContent: ', this.sendContent) }, sendData: function() { var data = this.data.sendContent + "\n" var that = this; var command = tsc.jpPrinter.createNew() command.setGap(0) command.setCls() command.setText(60, 90, "TSS24.BF2", 1, 1, data) command.setPagePrint() that.prepareSend(command.getData()) }, labelTest: function() { var that = this; var canvasWidth = that.data.canvasWidth var canvasHeight = that.data.canvasHeight var command = tsc.jpPrinter.createNew() command.setSize(48, 40) command.setGap(0) command.setCls() //需要设置这个，不然内容和上一次重复 command.setQR(1, 120, "L", 5, "A", "airenao.com") command.setText(60, 90, "TSS24.BF2", 1, 1, "成都爱热闹") command.setText(170, 50, "TSS24.BF2", 1, 1, "小程序测试") command.setText(170, 90, "TSS24.BF2", 1, 1, "测试数字12345678") command.setText(170, 120, "TSS24.BF2", 1, 1, "测试英文abcdefg") command.setText(170, 150, "TSS24.BF2", 1, 1, "测试符号/*-+!@#$") wx.canvasGetImageData({ canvasId: 'edit_area_canvas', x: 0, y: 0, width: canvasWidth, height: canvasHeight, success: function(res) { command.setBitmap(60, 0, 0, res) }, complete: function() { command.setPagePrint() that.setData({ isLabelSend: true }) that.prepareSend(command.getData()) } }) },

准备发送内容, printNum 这个是需要打印多少份，buff 是每次打印多少字节数

prepareSend: function(buff) { console.log('buff', buff) var that = this var time = that.data.oneTimeData var looptime = parseInt(buff.length / time); var lastData = parseInt(buff.length % time); console.log(looptime + "---" + lastData) that.setData({ looptime: looptime + 1, lastData: lastData, currentTime: 1, }) that.Send(buff) }, queryStatus: function() { //查询打印机状态 var command = esc.jpPrinter.Query(); command.getRealtimeStatusTransmission(1); this.setData({ returnResult: "查询成功" }) }, Send: function(buff) { //分包发送 var that = this var currentTime = that.data.currentTime var loopTime = that.data.looptime var lastData = that.data.lastData var onTimeData = that.data.oneTimeData var printNum = that.data.printerNum //打印多少份 var currentPrint = that.data.currentPrint var buf var dataView if (currentTime < loopTime) { buf = new ArrayBuffer(onTimeData) dataView = new DataView(buf) for (var i = 0; i < onTimeData; ++i) { dataView.setUint8(i, buff[(currentTime - 1) * onTimeData + i]) } } else { buf = new ArrayBuffer(lastData) dataView = new DataView(buf) for (var i = 0; i < lastData; ++i) { dataView.setUint8(i, buff[(currentTime - 1) * onTimeData + i]) } } console.log("第" + currentTime + "次发送数据大小为：" + buf.byteLength) wx.writeBLECharacteristicValue({ deviceId: app.BLEInformation.deviceId, serviceId: app.BLEInformation.writeServiceId, characteristicId: app.BLEInformation.writeCharaterId, value: buf, success: function(res) { console.log('写入成功', res) }, fail: function(e) { console.fail('写入失败', e) }, complete: function() { currentTime++ if (currentTime

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