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https://bbs.tsingfun.com/thread-1378-1-1.html 

优惠券批量生成及导入的思路 - 闲聊区 - 清泛IT论坛,有思想、有深度

...实物卡,如果卡密有规律可循将带来惨重的损失,因此其生成算法必须是完全随机的。我们知道,生成随机整数的方法大多数语言都是支持的,它们没法保障100%的不重复,因此只能接受这个事实。假设我们可以随机生成不重复...
https://bbs.tsingfun.com/thread-1686-1-1.html 

App Inventor 2 Encrypt.Security 安全性扩展:MD5哈希,SHA/AES/RSA/BASE6...

...“message”是例外的消息。OnRsaKeyPairGenrated当RSA密钥对成功生成时,将触发此事件。如果密钥对生成失败,则将触发“OnErrorOccured”事件而不是此事件。有两个变量,即RSA私钥和RSA公钥。方法BASE64Encode此方法用于BASE64编码一个字符...
https://www.tsingfun.com/it/ai2/2698.html 

App Inventor 2 QRCode 扩展:二维码扫描及生成方案都在这里 - App Invento...

App Inventor 2 QRCode 扩展:二维码扫描及生成方案都在这里1、QRCode 二维码扫码:使用原生的条码扫描器组件:2、二维码生成的方案:html + js + Web浏览器 方案3、QRCodeGenerator 拓展方案更多请参考这里。1、QRCode 二维码扫码: 使用原...
https://ullisroboterseite.de/a... 

AI2 Keep Awake

...r the CPU to be constantly active. Instead, an alarm can be used (see UrsAI2Alarm ). Motivation For some projects it is necessary to prevent the associated app from being deactivated by the operating system. A typical example would be that sensor data should be sent regularly to an MQTT bro...
https://www.tsingfun.com/it/bigdata_ai/341.html 

搭建高可用mongodb集群(二)—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...

...conds Sun Dec 29 22:03:05.499 [rsHealthPoll] DBClientCursor::init call() failed Sun Dec 29 22:03:05.499 [rsHealthPoll] replset info 192.168.1.138:27017 heartbeat failed, retrying Sun Dec 29 22:03:05.501 [rsHealthPoll] replSet info 192.168.1.138:27017 is down (or slow to respond): Sun Dec 29 22:0...
https://www.tsingfun.com/it/tech/1084.html 

浅谈Heatmap:网页热点图生成原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术

浅谈Heatmap:网页热点图生成原理在自然界之中,蛇的眼睛有夜视功能,即便是茫茫黑夜,它也能轻而易举的找到猎物,这是因为任何物体都会辐射热红外,且辐射的高低和温度成正...在自然界之中,蛇的眼睛有夜视功能,即便...
https://stackoverflow.com/ques... 

Why do we check up to the square root of a prime number to determine if it is prime?

...es this might be useful, but this all heavily depends on implementation details (programming language, hardware, data types, libraries), none of which are known in this general consideration. – Sven Marnach Aug 3 at 9:38 ...
https://www.tsingfun.com/it/te... 

C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升

...}//必须提供无参构造器,否则XmlSerializer将出错 } 序列化生成的XML文件: <Personxmlns:xsi="..."xmlns:xsd="..."> <Name>李志伟</Name> <Sex>true</Sex> </Person> (3)使用XmlAttribute 类声明: public class Person { [XmlElement] public string Name; ...
https://www.tsingfun.com/it/te... 

C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升

...}//必须提供无参构造器,否则XmlSerializer将出错 } 序列化生成的XML文件: <Personxmlns:xsi="..."xmlns:xsd="..."> <Name>李志伟</Name> <Sex>true</Sex> </Person> (3)使用XmlAttribute 类声明: public class Person { [XmlElement] public string Name; ...
https://www.tsingfun.com/it/te... 

C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升

...}//必须提供无参构造器,否则XmlSerializer将出错 } 序列化生成的XML文件: <Personxmlns:xsi="..."xmlns:xsd="..."> <Name>李志伟</Name> <Sex>true</Sex> </Person> (3)使用XmlAttribute 类声明: public class Person { [XmlElement] public string Name; ...