C ++，多语言/本地化支持 [英] C++, Multilanguage/Localisation support

问题描述

向C ++程序添加多语言支持的最佳方法是什么?

what's the best way to add multilanguage support to a C++ program?

如果可能，应该从纯文本文件中读取该语言，该文件包含类似键/值对(§WelcomeMessage§"Hello％s！")的内容.

If possible, the language should be read in from a plain text file containing something like key-value pairs (§WelcomeMessage§ "Hello %s!").

我想到了类似添加一个localizedString(key)函数的操作，该函数返回加载的语言文件的字符串.有更好或更有效的方法吗?

I thought of something like adding a localizedString(key) function that returns the string of the loaded language file. Are there better or more efficient ways?

//half-pseudo code
//somewhere load the language key value pairs into langfile[]
string localizedString(key)
{
    //do something else here with the string like parsing placeholders
    return langfile[key];
}

cout << localizedString(§WelcomeMessage§);

推荐答案

没有外部库的最简单方法:

Simplest way without external libraries:

//strings.h

// strings.h

enum
{
     LANG_EN_EN,
     LANG_EN_AU
};

enum
{
     STRING_HELLO,
     STRING_DO_SOMETHING,
     STRING_GOODBYE
};

//strings.c

// strings.c

char* en_gb[] = {"Well, Hello","Please do something","Goodbye"};
char* en_au[] = {"Morning, Cobber","do somin'","See Ya"};

char** languages[MAX_LANGUAGES] = {en_gb,en_au};

这将为您提供所需的内容.显然，您可以从文件中读取字符串.即

This will give you what you want. Obviously you could read the strings from a file. I.e.

//en_au.lang

// en_au.lang

STRING_HELLO,"Morning, CObber"
STRING_DO_SOMETHING,"do somin'"
STRING_GOODBYE,"See Ya"

但是您需要一个字符串名称列表以与字符串标题匹配.即

But you would need a list of string names to match to the string titles. i.e.

//parse_strings.c

// parse_strings.c

struct PARSE_STRINGS
{
    char* string_name;
    int   string_id;
}

PARSE_STRINGS[] = {{"STRING_HELLO",STRING_HELLO},
                   {"STRING_DO_SOMETHING",STRING_DO_SOMETHING},
                   {"STRING_GOODBYE",STRING_GOODBYE}};

在C ++中，上面的代码应该稍微容易一些，因为您可以使用枚举类的toString()方法(或者使用它，无论如何-都可以查找它).

The above should be slightly easier in C++ as you could use the enum classes toString() method (or what ever it as - can't be bothered to look it up).

您要做的就是解析语言文件.

All you then have to do is parse the language files.

我希望这会有所帮助.

PS:并访问字符串:

PS: and to access the strings:

languages[current_language][STRING_HELLO]

PPS:对C ++ C答案的一半表示歉意.

PPS: apologies for the half c half C++ answer.

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