微信小程序蓝牙连接小票打印机实例代码详解
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互联网集市收集整理的这篇技术教程文章主要介绍了微信小程序蓝牙连接小票打印机实例代码详解,小编现在分享给大家,供广大互联网技能从业者学习和参考。文章包含3544字,纯文字阅读大概需要6分钟。
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1.连接蓝牙
(第一次发表博客)
第一步打开蓝牙并搜索附近打印机设备//
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', }) } }) }
2.将搜索到的设备列表绑定点击事件并连接
bindViewTap: function(e) { var that = this wx.stopBluetoothDevicesDiscovery({ success: function(res) { console.log(res) }, }) that.setData({ serviceId: 0, writeCharacter: false, readCharacter: false, notifyCharacter: false }) var shebei = e.currentTarget.dataset.title wx.setStorageSync('shebei', shebei) 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 console.log(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) } }) }
3.连接成功后保存连接状态
getSeviceId: function() { var that = this var platform = app.BLEInformation.platform console.log(app.BLEInformation.deviceId) wx.getBLEDeviceServices({ deviceId: app.BLEInformation.deviceId, success: function(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) } }) } /** * 生命周期函数--监听页面加载 */ onLoad: function(options) { app.BLEInformation.platform = app.getPlatform() }
总结
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