微信小程序蓝牙连接小票打印机实例代码详解

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

以上所述是小编给大家介绍的微信小程序蓝牙连接小票打印机实例代码详解,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！
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