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https://bbs.tsingfun.com/thread-1678-1-1.html 

Linux 生产环境定位C++内存异常问题的思路 - 调试技术 - 清泛IT社区,为创新赋能!

...错信息是 stderr 标准错误输出,要使用 2> 重定向。最后一个& ,程序可以转向后台执行。 崩溃导致程序退出的问题,asan一般不会输出错误信息。 ---------------------- export ASAN_OPTIONS=new_delete_type_mismatch=0 指定这个选项,...
https://bbs.tsingfun.com/thread-1726-1-1.html 

App Inventor 2 复制屏幕功能,误删组件的“后悔药”,界面设计更便捷 - Ap...

...示一下屏幕的复制效果:1、Screen1屏幕上有若干组件、及一个SQLite拓展:2、点击工具栏上的“复制屏幕”按钮,输入新屏幕名称:3、复制后的Screen2:4、代码块也一并成功复制,且代码块中的屏幕名自动更新为Screen2: 来源中...
https://www.tsingfun.com/it/ai2/2704.html 

App Inventor 2 复制屏幕功能,误删组件的“后悔药”,界面设计更便捷 - Ap...

...一下屏幕的复制效果: 1、Screen1屏幕上有若干组件、及一个SQLite拓展: 2、点击工具栏上的“复制屏幕”按钮,输入新屏幕名称: 3、复制后的Screen2: 4、代码块也一并成功复制,且代码块中的屏幕名自动更新为Screen2: ...
https://bbs.tsingfun.com/thread-1784-1-1.html 

APP INVENTOR硬件交互学习教程04——蓝牙控制继电器 - 创客硬件开发 - 清泛...

这节主要是设计一个APP,连接蓝牙模块,通过按钮控制继电器的打开和关闭。 一、硬件部分 二、板子程序 串口接收字符,并输出控制继电器 // 引脚定义 const int ledPin1 =  5;// the number of the LED pin const int ledPin2 = &...
https://bbs.tsingfun.com/thread-2963-1-1.html 

App Inventor 2 接入腾讯云 CloudBase:让你的 App 瞬间拥有专业级后端能力...

...(https://tcb.cloud.tencent.com/dev),用腾讯云账号登录,创建一个新环境。 二步:安装 CloudBase 扩展 在 App Inventor 中文网(https://www.fun123.cn)下载 CloudBase 扩展组件,导入到项目中。 三步:配置环境 ID 并开始使用 将 CloudBa...
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Why is NaN not equal to NaN? [duplicate]

...nction; one of the examples given in the linked document is finding the zeros() of a function f(). It is entirely possible that in the process of probing the function with guess values that you will probe one where the function f() yields no sensible result. This allows zeros() to see the NaN and co...
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select * vs select column

If I just need 2/3 columns and I query SELECT * instead of providing those columns in select query, is there any performance degradation regarding more/less I/O or memory? ...
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How can I access my localhost from my Android device?

...twork), then use your desktop IP address assigned by the router (not localhost and not 127.0.0.1). To find out the IP address of your desktop: type into the command line ipconfig (Windows) or ifconfig (Unix) on Linux the one-liner ifconfig | grep "inet " | grep -v 127.0.0.1 will yield only t...
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What does CultureInfo.InvariantCulture mean?

...nstalledUICulture so the default CultureInfo is depending on the executing OS's settings. This is why you should always make sure the culture info fits your intention (see Martin's answer for a good guideline). CultureInfo.InvariantCulture Example CultureInfo.InvariantCulture on StackOverflow Cult...
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TCP vs UDP on video stream

...pliances are not designed with TCP streaming in mind. If you use TCP, the OS must buffer the unacknowledged segments for every client. This is undesirable, particularly in the case of live events; presumably your list of simultaneous clients is long due to the singularity of the event. Pre-record...