微信小程序如何实现蓝牙连接小票打印机

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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()
}

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