格式字符串前的下划线`_` [英] Underscore `_` before the format string

问题描述

我在这里查看一些 C 源代码，我发现了这个:

I'm here looking at some C source code and I've found this:

fprintf(stderr, _("Try `%s --help' for more information.
"), command);

我在查看 wxWidget 时已经看到了下划线，我读到它是用于国际化的.我发现它真的很可怕(有史以来最不直观的名字)，但我认为这只是另一个奇怪的 wxWidget 约定.

I already saw the underscore when I had a look at wxWidget, and I read it's used for internationalization. I found it really horrible (the least intutive name ever), but I tought it's just another weird wxWidget convention.

现在我在一些 Alsa 资源中再次找到它.有谁知道它来自哪里?

Now I find it again in some Alsa source. Does anyone know where it comes from?

推荐答案

它来自 GNU gettext，一个旨在简化国际化过程的包._() 函数只是一个字符串包装器.这个函数基本上在运行时用系统语言的翻译替换给定的字符串，如果可用的话(即，如果他们为程序提供了该语言的 .mo 文件).

It comes from GNU gettext, a package designed to ease the internationalization process. The _() function is simply a string wrapper. This function basically replaces the given string on runtime with a translation in the system's language, if available (i.e. if they shipped a .mo file for this language with the program).

这篇关于格式字符串前的下划线`_`的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！