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App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛,有思想、有深度

...在点击事件处理程序中调用点击数字过程,并将按钮显示文本作为参数,传递给该过程。如图2-4所示。图2-4 在按钮点击事件中调用点击数字过程以此类推,其他9个按钮的点击事件处理程序也将如法炮制。如图2-5所示。图2-5 所有...
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TCP 的那些事儿(下) - 更多技术 - 清泛网 - 专注C/C++及内核技术

...,突然变慢了,产生了比较大的延时,这个延时导致要重所有的包(因为之前的RTO很小),于是,因为重的不算,所以,RTO就不会被更新,这是一个灾难。 于是Karn算法用了一个取巧的方式——只要一发生重传,就对现有的R...
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一个故事告诉你比特币的原理及运作机制 - 创意 - 清泛网 - 专注C/C++及内核技术

...,这样就完成了支付,此时老李在电话中听到二狗子确认账完成,就可以放心让老张把羊牵走了。 此时比特村进入了中央系统虚拟货币时代。每个村民都不需要用实物支付,支付过程变成了二狗子那边维护的账本上数字的变...
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实战Nginx与PHP(FastCGI)的安装、配置与优化 - 更多技术 - 清泛网 - 专注...

...为/usr/local/php/etc/php-fpm.conf。 php-fpm.conf是一个XML格式的纯文本文件,其内容很容易看明白。这里重点介绍几个重要的配置标签: 标签listen_address是配置fastcgi进程监听的IP地址以及端口,默认是127.0.0.1:9000。 <value name="listen_addre...
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Maven dependency for Servlet 3.0 API?

How can I tell Maven 2 to load the Servlet 3.0 API? 10 Answers 10 ...
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Difference between an API and SDK

I am trying to explain to a non-developer the difference between an API an SDK. I need to explain why a commercial fingerprint software vendor will likely not provide an SDK, although they may certainly have used one. ...
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Web API Routing - api/{controller}/{action}/{id} “dysfunctions” api/{controller}/{id}

...default), which means use RouteTable.Routes.MapHttpRoute to map "WithActionApi" first, then "DefaultApi". Remove the defaults: new { id = System.Web.Http.RouteParameter.Optional } parameter of your "WithActionApi" rule because once id is optional, url like "/api/{part1}/{part2}" will never goes int...
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Difference between MVC 5 Project and Web Api Project

I am new to ASP.NET MVC and Web API and trying to get the basics. AFAIK, we have project templates in VS 2013, named as MVC , Web API and Both of them together . ...
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Difference between Google APIs (x86 System Image) and Google APIs (ARM System Image) in Android 4.4.

...m/google/play-services/setup.html#Install ). It asked me to install Google APIs for Android API 17 (or higher) but when i opened SDK Manager, this is how it looked like: ...
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API Keys vs HTTP Authentication vs OAuth in a RESTful API

I'm working on building a RESTful API for one of the applications I maintain. We're currently looking to build various things into it that require more controlled access and security. While researching how to go about securing the API, I found a few different opinions on what form to use. I've seen ...