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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网

...消息队列遥测传输) MQTT 发明于 1999 年,为物联网设计轻量级协议,基于TCP协议实现。 MQTT协议文档:https://mqtt.org/ MQTT服务质量(QoS):3个等级 QoS0:最低质量等级,最多发送一次消息,在消息发出后,接收者不会发...
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#1071 - Specified key was too long; max key length is 1000 bytes

... of 50, and certainly no need to index the full length of 255 characters. PS: The INT(1) and INT(32) data types indicates another misunderstanding about MySQL. The numeric argument has no effect related to storage or the range of values allowed for the column. INT is always 4 bytes, and it always...
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How do I sort an NSMutableArray with custom objects in it?

...xample so that users will be aware it exists too. – jpswain Dec 2 '11 at 20:30 6 ...
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Google Play app description formatting

...s got you here, most likely], just copy-paste the bullet character • PS You can also use unicode input combo to get the character Linux: CtrlShiftu 2022 Enter or Space Mac: Hold ⌥ 2022 release ⌥ Windows: Hold Alt 2022 release Alt Mac and Windows require some setup, read on Wikipedia P...
https://www.tsingfun.com/it/cpp/1383.html 

C++ 线程安全单例模式 - C/C++ - 清泛网 - 专注C/C++及内核技术

C++ 线程安全单例模式一、懒汉模式:即第一次调用该类实例时候才产生一个新该类实例,并在以后仅返回此实例。需要用锁,来保证其线程安全性:原因:多个线程 一、懒汉模式:即第一次调用该类实例时候才产生...
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CFileDialog用法及参数解释 - C/C++ - 清泛网 - 专注C/C++及内核技术

CFileDialog用法及参数解释CFileDialog 在MSDN中函数原型:CFileDialog::CFileDialog( BOOL bOpenFileDialog, LPCTSTR lpszDefExt = NULL, LPCTSTR ...CFileDialog 在MSDN中函数原型: CFileDialog::CFileDialog( BOOL bOpenFileDialog, LPCTSTR lpszDefExt = NULL, LPCTS...
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给VC/SDK中应用程序加上皮肤(实例演示) - C/C++ - 清泛网 - 专注C/C++及内核技术

给VC/SDK中应用程序加上皮肤(实例演示)网上MFC加皮肤资料蛮多,SDK方面相对较少,但是原理雷同,废话不多说了。简单说明一下过程1、复制 SkinH.dll、SkinH.lib、SkinH.h ... 本实例运行效果图 网上MFC加皮肤资料蛮多...
https://www.tsingfun.com/ilife/tech/993.html 

搜狗广告研发部:搜索大数据驱动市场营销 - 资讯 - 清泛网 - 专注C/C++及内核技术

...大纲大数据影响,营销领域搜狗搜索大数据,每天,数亿网民通过各种设备,在搜狗搜索表达搜索意愿汽车行业相关搜索词:10万左右车排... 内容大纲 大数据影响,营销领域 搜狗搜索大数据,每天,数亿网民通过各...
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记一次诡异Linux程序启动即崩溃:Program received signal SIGSEGV, Segm...

记一次诡异Linux程序启动即崩溃:Program received signal SIGSEGV, Segmentation fault.最近碰到一个非常诡异Linux 程序崩溃现象,Eclipse CDT编译出来Debug版程序启动即崩,感觉程序都没有完全加载好就崩溃了,堆栈如下:Program received sig...
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手把手教你用Strace诊断问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...用 strace 挂上去看看,不过当你挂上去了,看着满屏翻滚字符,却十有八九看不出个所以然。本文通过一个简单案例,向你展示一下在用 strace 诊断问题时一些套路。 如下真实案例,如有雷同,实属必然!让我们看一台高...