如何将Unicode代码点转换为C ++中的字符使用ICU？ [英] How to convert a Unicode code point to characters in C++ using ICU?

问题描述

不知怎的，我在Google找不到答案。我在搜索时可能使用了错误的术语。我试图执行一个简单的任务，将表示一个字符的数字转换为字符本身，如下表： http://unicode-table.com/en/#0460

Somehow I couldn't find the answer in Google. Probably I'm using the wrong terminology when I'm searching. I'm trying to perform a simple task, convert a number that represents a character to the characters itself like in this table: http://unicode-table.com/en/#0460

例如，如果我的号码是47（即\ ），我可以把47放在 char 中并使用 cout 打印，我会在控制台看到一个反斜杠（对于低于256的数字没有问题）。

For example, if my number is 47 (which is '\'), I can just put 47 in a char and print it using cout and I will see in the console a backslash (there is no problem for numbers lower than 256).

但是如果我的数字是1120，字符应该是'Ѡ'我假设它由几个字符表示（ cout 在打印到屏幕时会知道转换为'Ѡ'）。

But if my number is 1120, the character should be 'Ѡ' (omega in Latin). I assume it is represented by several characters (which cout would know to convert to 'Ѡ' when it prints to the screen).

如何获取这些代表Ѡ的几个字符？

How do I get these "several characters" that represent 'Ѡ'?

我有一个名为ICU的库，我使用UTF-8

I have a library called ICU, and I'm using UTF-8.

推荐答案

所谓的 Unicode号码通常称为 >。如果要使用C ++和Unicode字符串，ICU会提供一个 icu :: UnicodeString 类。您可以在此处查找文档。

What you call Unicode number is typically called a code point. If you want to work with C++ and Unicode strings, ICU offers a icu::UnicodeString class. You can find the documentation here.

要创建一个包含单个字符的 UnicodeString ，您可以使用构造函数在 UChar32 中采用代码点：

To create a UnicodeString holding a single character, you can use the constructor that takes a code point in a UChar32:

icu::UnicodeString::UnicodeString(UChar32 ch)

toUTF8String 方法转换字符串到UTF-8。

Then you can call the toUTF8String method to convert the string to UTF-8.

示例程序：

#include <iostream>
#include <string>

#include <unicode/unistr.h>

int main() {
    icu::UnicodeString uni_str((UChar32)1120);
    std::string str;
    uni_str.toUTF8String(str);
    std::cout << str << std::endl;

    return 0;
}

在像Debian这样的Linux系统上， p>

On a Linux system like Debian, you can compile this program with:

g++ so.cc -o so -licuuc

如果您的终端支持UTF-8，这将打印一个欧米茄字符。

If your terminal supports UTF-8, this will print an omega character.

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