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App Inventor 2 扩展开发实战:从Java小白到发布第一个.aix自定义插件 - Ap...

App Inventor 2 扩展开发实战:从Java小白到发布第一个.aix自定义插件 刚接触App Inventor 2时,大部分人会被它现成的组件库"惯坏"——想听歌有Player、想拍照有Camera、想存数据有TinyDB。但做着做着就发现,有些需求官方组件...
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App Inventor 2 串口调试 App 全方案技术调研 - App应用开发 - 清泛IT社区,为创新赋能!

App Inventor 2 串口调试 App 全方案技术调研 前言 串口调试器是硬件开发、嵌入式工程中最常用的工具。很多同学问:App Inventor 2 能不能做一个手机版的串口调试器?答案是:不仅能做,而且有多条技术路线可选。本文从源码...
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What is more efficient? Using pow to square or just multiply it with itself?

...(); } double elapsed() const { return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::high_resolution_clock::now() - from).count() * 1.0e-6; } private: std::chrono::high_resolution_clock::time_point from; }; int main (int argc, char* argv[]) { do...
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开源MQTT网关:EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区,为创新赋能!

引言物联网开发者需要为自己的物联网项目选择合适的 MQTT 消息产品或服务,从而构建可靠高效的基础数据层,保障上层物联网业务。目前市面上有很多开源的 MQTT 产品,在性能功能等方面各有优点。本文将选取目前最为流行的...
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关于App Inventor 2过程积木,被问最多的6个问题 - App应用开发 - 清泛IT社...

逛社区和技术群时发现一个有意思的现象:很多新手能熟练使用变量、循环、条件判断,但一提到"过程"(Procedures)就发怵——"感觉用不上""加了参数就搞不懂""不知道什么时候该用过程"。<br><br>其实过程(有的地方也叫"函数"...
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Can a class member function template be virtual?

...ing&gt;* p = &amp;a; p-&gt;func1("A&lt;string&gt; a"); p = dynamic_cast&lt;A&lt;string&gt;*&gt;(&amp;c); p-&gt;func1("B&lt;string&gt; c"); B&lt;int&gt;* q = &amp;b; q-&gt;func1(3); } and the output is: A:A&lt;string&gt; a A&lt;--B:B&lt;string&gt; c A&lt;--B:3 And later I add...
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【教学】AppInventor2人工智能应用:Personal Image Classifier (PIC) Tool...

繁体中文原文:https://blog.cavedu.com/2019/08/27/app-inventor-image-classifier/ [color=var(--fs-experimental-link-color)][color=var(--fs-color-primary)]27 [size=0.8em]8 月 MIT App Inventor 團隊蠻早就發佈了 [color=var(--fs-experimental-link-color)]look extension,概念上...
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Actionbar notification count icon (badge) like Google has

...tifCount(...) is useless. Just call setText(...) on the badge. And you can cast getActionView() to Button directly. – caw Mar 1 '14 at 15:30 4 ...
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BLE(四)嗅探工具 - 创客硬件开发 - 清泛IT社区,为创新赋能!

文章源自:https://www.gandalf.site/2018/11/ble_26.html 商业级的Ellisys BEX400侦听工具最为符合对BLE流量捕获及分析的要求,然而售价过于昂贵; 其次,作为开源硬件且配有混杂模式追踪的“超牙”设备——Ubertooth One拥有二次开发和嗅...
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Traits vs. interfaces

... example of a trait. to_integer would be more likely included in an IntegerCast interface because there is no fundamentally similar way to (intelligently) cast classes to an integer. – Matthew Feb 9 '12 at 4:13 ...