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MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区,为创新赋能!

...条消息就发送上千条采集的数据,或者比较大的设备阴影文件。技术挑战TCP需要解决的问题是在IP包传输过程中,处理异构网络环境下的网络拥塞、丢包、乱序、重复包等多种问题。MQTT解决的问题是,在低带宽高延迟不可靠的网...
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我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑",手机一划车就...

...拟方向盘 - Clock(定时器) — 方向盘位置到指令的轮询转换 - ListPicker — 显示已配对蓝牙设备列表 关键实现 第一步:蓝牙连接 当 Screen1.初始化   执行 ListPicker1.元素列表 设为 BluetoothClient1.地址及名称 用户点...
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ServiceStack vs ASP.Net Web API [closed]

...cellent MVC Mini Profiler) Includes Sql Profiling JSON/JSONP, XML, JSV, CSV and SOAP end-points The RestServiceBase and ServiceBase classes are intended to host your custom C# logic for maximum potential re-use as possible, e.g. Its DTO-first design trivially allows for deferred and proxied exe...
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Elegant setup of Python logging in Django

... I am currently using a logging system, which I created myself. It uses CSV format for logging. django-csvlog This project still doesn't have full documentation, but I am working on it. share | ...
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BIO与NIO、AIO的区别(这个容易理解) - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...塞的,而采用select函数有个好处就是它可以同时监听多个文件句柄,从而提高系统的并发性! 异步非阻塞IO:在此种模式下,用户进程只需要发起一个IO操作然后立即返回,等IO操作真正的完成以后,应用程序会得到IO操作完成的...
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理解和配置 Linux 下的 OOM Killer - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...给系统用,不致于让系统立刻崩溃。如果检查相关的日志文件(/var/log/messages)就会看到下面类似的 Out of memory: Kill process 信息: ... Out of memory: Kill process 9682 (mysqld) score 9 or sacrifice child Killed process 9682, UID 27, (mysqld) total-vm:47...
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How can I access and process nested objects, arrays or JSON?

...bout JSON? JSON is a textual representation of data, just like XML, YAML, CSV, and others. To work with such data, it first has to be converted to JavaScript data types, i.e. arrays and objects (and how to work with those was just explained). How to parse JSON is explained in the question Parse JSO...
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30条爆笑的程序员梗 PHP是最好的语言 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术

...憋屈的事情就是:你辛辛苦苦熬夜写了一个风格优雅的源文件,被一个代码风格极差的同事改了且没署名,以至于别人都以为是你写的。 24.应聘 程序员应聘必备词汇:了解=听过名字;熟悉=知道是啥;熟练=用过;精通=做过东西。 ...
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mfc里面的140种颜色宏 - C/C++ - 清泛网 - 专注C/C++及内核技术

...ine CLR_BLACK RGB( 0, 0, 0) // 纯黑 完整.h文件下载:ColorDef.zip mfc 颜色宏
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社会化海量数据采集爬虫框架搭建 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

... 2、复制页面内容的标题、作者、内容。 3、存储到文本文件或者excel。 从技术角度来说整个过程主要为 网络访问、扣取结构化数据、存储。我们看一下用java程序如何来实现这一过程。 import java.io.IOException; import org.apache.com...