微信小程序蓝牙连接小票打印机

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()

}