打印wchar到Linux控制台？ [英] Print wchar to Linux console?

问题描述

我的C程式贴在下面。在bash中，程序打印char is，不打印Ω
。我的区域设置都是en_US.utf8。

My C program is pasted below. In bash, the program print "char is ", Ω is not printed. My locale are all en_US.utf8.

#include <stdio.h>
#include <wchar.h>
#include <stdlib.h>

int main() {
   int r;
   wchar_t myChar1 = L'Ω';
   r = wprintf(L"char is %c\n", myChar1);
}

推荐答案

显然，编译器将omega从UTF-8转换为UNICODE，但不知何故，libc会把它弄乱。

This was quite interesting. Apparently the compiler translates the omega from UTF-8 to UNICODE but somehow the libc messes it up.

首先：％c -format说明符需要 char （即使在 wprintf -version），所以你必须指定％lc （因此％ls 字符串）。

First of all: the %c-format specifier expects a char (even in the wprintf-version) so you have to specify %lc (and therefore %ls for strings).

其次，如果你运行你的代码，语言环境设置为 C 环境）。您必须致电 setlocale 空字符串从环境中获取语言环境，所以libc再次很高兴。

Secondly if you run your code like that the locale is set to C (it isn't automatically taken from the environment). You have to call setlocale with an empty string to take the locale from the environment, so the libc is happy again.

#include <stdio.h>
#include <wchar.h>
#include <stdlib.h>
#include <locale.h>

int main() {
    int r;
    wchar_t myChar1 = L'Ω';
    setlocale(LC_CTYPE, "");
    r = wprintf(L"char is %lc (%x)\n", myChar1, myChar1);
}

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