如何将十六进制表示从URL (%)转换为std::string (中文文本)？

#include <iostream>
#include <string>

// 将十六进制字符串转换为整数
int hexToInt(const std::string& hex) {
    int result;
    std::stringstream ss;
    ss << std::hex << hex;
    ss >> result;
    return result;
}

// 将整数转换为字符
std::string intToChar(int value) {
    std::string result;
    result += static_cast<char>(value);
    return result;
}

// 将十六进制表示从URL (%)转换为std::string
std::string urlHexToString(const std::string& url) {
    std::string result;
    std::string hex;
    
    for (std::size_t i = 0; i < url.size(); ++i) {
        if (url[i] == '%') {
            hex = url.substr(i + 1, 2);
            result += intToChar(hexToInt(hex));
            i += 2;
        } else {
            result += url[i];
        }
    }
    
    return result;
}

int main() {
    std::string url = "%E4%BD%A0%E5%A5%BD";
    std::string text = urlHexToString(url);
    std::cout << "转换后的文本: " << text << std::endl;
    
    return 0;
}