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网站的支持!
如果你觉得本文对你有帮助,欢迎转载,烦请注明出处,谢谢!

华山资源网 Design By www.eoogi.com
广告合作:本站广告合作请联系QQ:858582 申请时备注:广告合作(否则不回)
免责声明:本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除!
华山资源网 Design By www.eoogi.com

RTX 5090要首发 性能要翻倍!三星展示GDDR7显存

三星在GTC上展示了专为下一代游戏GPU设计的GDDR7内存。

首次推出的GDDR7内存模块密度为16GB,每个模块容量为2GB。其速度预设为32 Gbps(PAM3),但也可以降至28 Gbps,以提高产量和初始阶段的整体性能和成本效益。

据三星表示,GDDR7内存的能效将提高20%,同时工作电压仅为1.1V,低于标准的1.2V。通过采用更新的封装材料和优化的电路设计,使得在高速运行时的发热量降低,GDDR7的热阻比GDDR6降低了70%。