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https://bbs.tsingfun.com/thread-2758-1-1.html 

急求技术支持,不知如何将WxBit版APP Inventor的MQTT客户端转化为App Inven...

手机APP代码块描述:设置了当MQTT连接建立之后订阅相关主题和连接断开后给出提示。 手机APP代码块描述:设置了按钮事件,当开锁按钮被点击后就通过主题发送数字1,反之发送数字0。 达到效果:手机APP端数据显示 ...
https://bbs.tsingfun.com/thread-2945-1-1.html 

AppInventor 如何拼接 json 文本 - App应用开发 - 清泛IT社区,为创新赋能!

需要拼接 json 文本通过 mqtt 发送,原理是利用字典的特性,它天生就是 json 的一种表现,打印出来就是 json 格式文本,拼接方式如下: 使用 创建字典 代码块,默认只有 2 个插槽,表面上看起来只能放 2 组数据,但是它是...
https://www.tsingfun.com/it/tech/886.html 

快速开发CSS的利器LESS 系列教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...家介绍基本的less用法,之后进行less具体知识的讲解。 如何使用less 使用less的几个基本要求: 1、要求编辑器能够支持less文件的编译 2、要求html文件能够解析less文件 3、less的运行环境 让sublime text支持less文件的编译 打开:h...
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Why do we need private subnet in VPC?

... alternative mechanism for VPC instances in a private subnet to access the Internet, where previously, the common solution was an EC2 instance on a public subnet within the VPC, functioning as a "NAT instance," providing network address translation (technically, port address translation) for instanc...
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ASP.NET Temporary files cleanup

...n the referenced article that indicates it's safe to delete the files. The internet seems to either say it's safe to delete, or that you must stop IIS first, which is it? – Nine Tails Sep 1 at 15:53 ...
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Internet Explorer 8 Developer Tools not displaying

Within the last day, in Internet Explorer 8, the developer tools window will not show up. 9 Answers ...
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贝因美创始人谈连续创业 谢宏:蓝海策略下的未来赢家 - 资讯 - 清泛网 - 专...

...程,阐释成功创业创新的关键点。 “现在主要精力在于如何帮助贝因美转型升级,对于我个人而言,原来是创业家,企业家,现在则是转为帮助他们去创业”,谢宏在接受《每日经济新闻》(以下简称NBD)记者专访时透露,8月28...
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SecurityException: Permission denied (missing INTERNET permission?)

... Exception you are getting (SecurityException: Permission denied (missing INTERNET permission?)), clearly indicates that you are not allowed to do networking. That's pretty indisputable fact. But how can this happen? Usually it's either due to missing <uses-permission android:name="android.permi...
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How to add manifest permission to an application?

...here is my contents for my AndroidManifest.xml file that has access to the internet: <manifest xlmns:android...> ... <uses-permission android:name="android.permission.INTERNET" /> <application ... </manifest> Other than that, you should be fine to download a file from the ...
https://www.tsingfun.com/it/tech/1393.html 

程序员之网络安全系列(六):动态密码 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...六):动态密码前文回顾程序员之网络安全系列(二):如何安全保存用户密码及哈希算法我们保证了数据的完整性程序员之网络安全系列(三):数据加密之对称...前文回顾 程序员之网络安全系列(二):如何安全保存用...