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MQTT 打包后,运行退到后台在返回,mqtt连接掉线问题 - App应用开发 - 清泛...

打包后的APP安装到手机上,刚开始打开软件的时候,连接成功,屏幕退到后台在反回app界面的时候,显示MQTT未连接(联网失败) 请帮忙解决一下这个是需要进行状态管理,当状态变成连接失败时,需要进行一次重新连接:将连...
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AppInventor2 知识产权保护相关问题分享 - App Inventor 2 中文网 - 清泛IT...

Q:AppInventor2开发的APP可以去工信部备案吗?软件可以申请软件著作权吗? 上架小米、华为、v、o的应用商店大致的流程是什么样的 软件开发平台是否是开源的,做出的软件想要盈利是否会有影响? ------------------------------...
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串口Read不到数据的问题 - 用户反馈 - 清泛IT社区,为创新赋能!

用户发送的是 8n1 的格式,但是ai2的串口貌似不支持这种格式。写串口正常,读串口为空,len为0。 目前经过测试验证,应该是 \n 作为结束符的。发送时,也是。 ai2使用 physicaloid 库完成的串口功能。
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check if jquery has been loaded, then load it if false

...Query OR include_once equivalent for js. Ref: https://raw.github.com/kvz/phpjs/master/functions/language/include_once.js function include_once (filename) { // http://kevin.vanzonneveld.net // + original by: Legaev Andrey // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.n...
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PHP: How to handle

... No, PHP skips CDATA completely for some reason. Any other ideas? – Angelo Jun 4 '10 at 0:24 4 ...
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C++静态和多态,亦敌亦友 - C/C++ - 清泛网 - 专注C/C++及内核技术

...平共存,时而协同工作。 老规矩,还是一小段代码提出问题,当一个虚成员函数(多态性)在其子类中被声明为静态成员函数时(或相反过来),会发生什么? 1、当虚函数遭遇静态函数 #include <iostream> using namespace std; cla...
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Easy way to test a URL for 404 in PHP?

... If you are using PHP's curl bindings, you can check the error code using curl_getinfo as such: $handle = curl_init($url); curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE); /* Get the HTML or whatever is linked in $url. */ $response = cur...
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Should everything really be a bundle in Symfony 2.x?

...ces to group related entities together, for example, src/Vendor/User/Group.php. In this case, the entity's name is Model:User\Group. Keeping controllers out of bundles First, you need to tell JMSDiExtraBundle to scan the src folder for services by adding this to config.yml: jms_di_extra: locatio...
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How to set a cookie for another domain

...get b.com to set the cookie. If a.com redirect the user to b.com/setcookie.php?c=value The setcookie script could contain the following to set the cookie and redirect to the correct page on b.com &lt;?php setcookie('a', $_GET['c']); header("Location: b.com/landingpage.php"); ?&gt; ...
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java中的缓存技术该如何实现 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...存在于什么地方?3缓存有哪些属性?4缓存介质?搞清楚这4个问题,那么我们就可以随意的通过应用的场景来判断使用何...1、缓存为什么要存在? 2、缓存可以存在于什么地方? 3、缓存有哪些属性? 4、缓存介质? 搞清楚这4个...