微信小程序藍牙連接小票打印機實例代碼詳解
1.連接藍牙
(第一次發(fā)表博客)
第一步打開藍牙并搜索附近打印機設(shè)備//
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: '本機藍牙不可用', }) } }, }) }, fail: function() { wx.showModal({ title: '提示', content: '藍牙初始化失敗,請打開藍牙', }) } }) }
2.將搜索到的設(shè)備列表綁定點擊事件并連接
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: '正在連接', }) 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: '連接失敗', }) console.log(e) wx.hideLoading() }, complete: function(e) { console.log(e) } }) }
3.連接成功后保存連接狀態(tài)
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: '找不到該讀寫的特征值', }) } 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) } }) } /** * 生命周期函數(shù)--監(jiān)聽頁面加載 */ onLoad: function(options) { app.BLEInformation.platform = app.getPlatform() }
總結(jié)
以上所述是小編給大家介紹的微信小程序藍牙連接小票打印機實例代碼詳解,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會及時回復(fù)大家的。在此也非常感謝大家對腳本之家網(wǎng)站的支持!
如果你覺得本文對你有幫助,歡迎轉(zhuǎn)載,煩請注明出處,謝謝!
相關(guān)文章
js如何監(jiān)聽input輸入事件及使用防抖封裝函數(shù)處理方法
這篇文章主要給大家介紹了關(guān)于js如何監(jiān)聽input輸入事件及使用防抖封裝函數(shù)處理方法的相關(guān)資料,最近有一個需求,需要我們實時監(jiān)聽input輸入框中的內(nèi)容,從而帶來更好的用戶體驗,需要的朋友可以參考下2023-07-07使用indexOf等在JavaScript的數(shù)組中進行元素查找和替換
使用slice、replace、indexOf等等在JavaScript的數(shù)組中進行元素的查找和替換,感興趣的朋友可以學(xué)習(xí)下2013-09-09javascript改變position值實現(xiàn)菜單滾動至頂部后固定
現(xiàn)在很多網(wǎng)站都有這樣的一個效果,當(dāng)頁面滾動到一定高度時,菜單欄會固定在頁面頂部;該效果在 ie6 下不支持,因為ie6不支持 position:fixed,效果很不錯,感興趣的朋友可以了解下啊2013-01-01傳參安全處理window.btoa base64加密,線性對稱加密
這篇文章主要介紹了傳參安全處理window.btoa base64加密,線性對稱加密,需要的朋友可以參考下2023-07-07JavaScript字符串截取方法總結(jié)(slice、substring、substr等)
在開發(fā)中常常會需要截取字符串,而 JavaScript 提供了很多種方法實現(xiàn)截取操作,本文對各種方法做個整理,文中通過代碼示例給大家介紹的非常詳細,需要的朋友可以參考下2024-01-01