使用 wchar_t 更改字符类型不像 L

Question

在我的代码中，我尝试创建大量的 4 位字符，其中每个字符都包含一个西里尔字母。

  wchar_t OUT_STRING[4] = { L'т',L'л',L'о',L'р' };

一切正常，我有预期的输出。这只是测试，实际上我需要将元素从字符串转换为与 OUT_STRING 中相同的类型；我试着用这样的东西：

 wchar_t OUT_STRING[4] = { (wchar_t)'т',L'л',L'о',L'р' };

但它没有用，在输出中我有一个矩形。

Answer 1

I think you want to pass in a string using std::string in UTF-8 encoding and process it one character at a time, each time converting the single character to a wide character string of length 1 so that you can pass it to TTF_SizeUNICODE, and TTF_RenderUNICODE_Blended.

I will demonstrate the relevant string conversion code.

Here is a test function that expects a null-terminated wide character string with just one character in it. The body of main shows how to convert a UTF-8 string to UTF-16 (using codecvt_utf8_utf16) and how to convert a single character to a string (using std::wstring(1, ch))

#include <string>
#include <codecvt> 
#include <iostream>

void test(const wchar_t* str) {
    std::cout << "Number of characters in string: " << wcslen(str) << std::endl;

    for (const wchar_t* ch = str; *ch; ++ch) {
        std::cout << ((int)*ch) << std::endl;
    }
}

int main() {
    std::string input = u8"тлор";
    for (wchar_t ch : std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>, wchar_t>().from_bytes(input)) {
        std::wstring string_with_just_one_character(1, ch);

        test(string_with_just_one_character.c_str());
    }
    return 0;
}

使用 wchar_t 更改字符类型不像 L

Changing type of char using wchar_t used not so like L

c++

types

wchar-t