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App Inventor 2 计时器（Clock）详细用法示例 · App Inventor 2 中文网
...
计时器在界面设计中的哪里？
计时器怎么启动？
怎么确定计时器执行没？
怎么获取手机当前时间？
格式化时间，上面函数返回的当前时刻格式化成文本：
24小时格式怎么写？
如何...
App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
...试，效果如下：
云平台服务器端可以查看订阅设备的数量，以及消息的发送历史：
.aia 源码下载
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《App Inventor 2 UrsPahoMqttClient 拓展中文文档（完整版）》
准备工作
APPINVENTOR测试平台：AppInventor2...
软件里面自带的图表组件绘制出来的曲线 带有数据点，请问如何取消该点 - Ap...
...是上面这种类型，想请教一下如何把这个点取消掉
原生的图表数据点无法去掉。要想使用高级/定制图表，考虑使用拓展：https://bbs.tsingfun.com/thread-1688-1-1.html，或者使用js版本的echarts.js，使用Web浏览器与js交互实现高度定制的图...
AppInventor2可以接收VR眼镜的头传吗？ - App应用开发 - 清泛IT社区，为创新赋能！
Q：想问一下你这个软件可以接收VR眼镜的头传吗？
A：支持的，不过是间接的调用vr眼镜配套的app，使用 activity 启动器组件，核心功能还得是 vr 提供商的 app，核心代码块参考如下：
应用程序（对于 Expeditions 或 Virtuality）...
Reset C int array to zero : the fastest way?
...eap-allocated arrays, where N is the number of elements
By the way, in C++ the idiomatic way would be to use std::fill (from <algorithm>):
std::fill(myarray, myarray+N, 0);
which may be optimized automatically into a memset; I'm quite sure that it will work as fast as memset for ints, w...
Why is volatile needed in C?
... Came into existence? Wasn't ´volatile` originally borrowed from C++? Well, I seem to remember...
– syntaxerror
Jan 25 '16 at 4:51
...
How can I “unuse” a namespace?
One of the vagaries of my development system (Codegear C++Builder) is that some of the auto-generated headers insist on having...
...
xtree(1796): warning C4800: “int”: 将值强制为布尔值“true”或“false...
...\Microsoft Visual Studio 11.0\VC\include\xtree(1775): 参见对正在编译的函数 模板 实例化“std::pair<_Ty1,_Ty2> std::_Tree<_Traits>::_Insert_nohint<std::pair<const _Kty,_Ty>&,_Nodety>(bool,_Valty,_Nodety)”的引用
1> with
1> [
1> _Ty1=std::_Tree_iter...
Writing a compiler in its own language
...le back ends that can be swapped out.
A little known fact is that the GNU C++ compiler has an implementation that uses only the C subset. The reason being it is usually easy to find a C compiler for a new target machine that allows you to then build the full GNU C++ compiler from it. You have now b...
How to See the Contents of Windows library (*.lib)
...r example) in order to call them correctly.
For functions linked with the C++ binary interface, the calling convention and arguments are encoded in the exported name of the function (also called "name mangling"). DUMPBIN /SYMBOLS will show you both the "mangled" function name as well as the decode...