C++如何将字符串字符转换为精确的十六进制字节

#include <iostream>
#include <iomanip>
#include <sstream>

std::string stringToHex(const std::string& input) {
    std::ostringstream oss;
    for (size_t i = 0; i < input.size(); ++i) {
        oss << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(static_cast<unsigned char>(input[i]));
    }
    return oss.str();
}

int main() {
    std::string str = "Hello, World!";
    std::string hexStr = stringToHex(str);
    std::cout << "Original string: " << str << std::endl;
    std::cout << "Hex representation: " << hexStr << std::endl;
    return 0;
}