runtime | 易学教程

Multi language android app during Runtime?

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问题 My aim is to change an application language from English to Chinese during runtime, is there any suggestions? language_spinner = (Spinner)findViewById(R.id.settings_language_spinner); language_spinner.setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) { if (pos == 1){ Toast.makeText(parent.getContext(),"You have selected English",Toast.LENGTH_SHORT).show(); setLocale("en"); }else if (pos == 2){ Toast.makeText

MySQL中间件之ProxySQL总结

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MySQL中间件之ProxySQL总结 1、ProxySQL简介 ProxySQL为MySQL的中间件，其有两个版本，官方版和percona版，percona版是基于官方版基础上修改而来。ProxySQL是用C++语言开发的，虽然也是一个轻量级产品，但性能很好(据测试，能处理千亿级的数据)，功能也足够，能满足中间件所需的绝大多数功能，包括： 1)最基本的读/写分离，且方式有多种。 2)可定制基于用户、基于schema、基于语句的规则对SQL语句进行路由。换句话说，规则很灵活。基于schema和与语句级的规则，可以实现简单的sharding。 3)可缓存查询结果。虽然ProxySQL的缓存策略比较简陋，但实现了基本的缓存功能，绝大多数时候也够用了。此外，作者已经打算实现更丰富的缓存策略。 4)监控后端节点。ProxySQL可以监控后端节点的多个指标，包括：ProxySQL和后端的心跳信息，后端节点的read-only/read-write，slave和master的数据同步延迟性(replication lag)。 2、proxysql的配置系统体系结构整个配置系统分为三层，如下所示: proxysql的每一个配置项在三层中都存在，但是这三层是独立的，也就是说，proxysql可以同时拥有三份配置，每层都是独立的，可能三份都不一样，可能三份都一样。 RUNTIME这个顶级层

How do I get the number of members in a structure?

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问题 I want to count the number of members in a structure. For example: typedef struct { char MrChar; int MrInt; long MrLong; } Bg_Typedef; Bg_Typedef FooStr; I create a function prototype that should return number of members in the structure int NumberOfMem(Bg_Typedef *psStructure); => NumberOfMem(&FooStr) should return 3 回答1: It can be done with X_MACRO's. Do something like this: #define X_BG_MEMBERS \ X(char, MrChar) \ X(int, MrInt) \ X(long, MrLong) typedef struct { #define X(type, member)

Running Shell or System Command in JAVA

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问题 private void myFunction(String userName){ String fileName = this.generateFile(userName); String[] command = new String[4]; command[0] = "cmd"; command[1] = "/C"; command[2] = "dir"; command[3] = "7za a "+ userName+".7z "+ fileName +" -p"+this.password; try { Process p = Runtime.getRuntime().exec(command); BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream())); BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream())); while ((s =

Running Shell or System Command in JAVA

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Add property to POCO class at runtime

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问题 I selected ServiceStack OrmLite for my project which is a pure Data-Oriented application. I am willing to allow the end user to create his own Object Types defined in an XML format that will be used to generate classes at runtime using CodeDOM. I will be also defining some "system" objects required by the application (i.e. User ) but I cannot foresee all the properties the end user will use and therefore I am looking for a way to allow extending the classes I create in design time. Sample

Extending JPA entity data at runtime

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问题 I need to allow client users to extend the data contained by a JPA entity at runtime. In other words I need to add a virtual column to the entity table at runtime. This virtual column will only be applicable to certain data rows and there could possibly be quite a few of these virtual columns . As such I don't want to create an actual additional column in the database, but rather I want to make use of additional entities that represent these virtual columns . As an example, consider the

run-time vs. compile-time iPhone version check

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问题 What's the difference between run-time, e.g., [[UIDevice currentDevice] systemVersion] , and compile-time, e.g., __IPHONE_OS_VERSION_MIN_REQUIRED checking? When should you one over the other? Is __IPHONE_OS_VERSION_MIN_REQUIRED just a variable set in Build Settings? I've read the answers to How to target a specific iPhone version? and other related questions listed below. But, I just noticed that __IPHONE_OS_VERSION_MIN_REQUIRED = 30200 when I build & run on iPhone (4.3.1) with Xcode 4. Why?

Is static_cast<T>(…) compile-time or run-time?

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问题 Is static_cast<T>(...) something that gets done at compile-time or run-time? I've googled around but I got different answers. Also, dynamic_cast<T>(...) is obviously runtime - but what about reinterpret_cast<T>(...) ? 回答1: Depends on what you are casting to what else. E.g. static_cast<std::string>("Hello") ends up calling std::string constructor. Off the top of my head, I can't think of any case where reinterpret_cast would need to generate actual machine instructions. It's just telling the

An unhandled exception of type 'System.IO.FileNotFoundException' occurred in Unknown Module

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问题 I am developing a c# application and I get the following error at debug runtime: An unhandled exception of type 'System.IO.FileNotFoundException' occurred in Unknown Module. Additional information: Could not load file or assembly 'Autodesk.Navisworks.Timeliner.dll' or one of its dependencies. The specified module could not be found. Autodesk.Navisworks.Timeliner.dll is in the debug folder of the application. I have repaired the .net framework (version 4) but it did not resolve it. Any ideas