在C++中将十六进制字符串转换为无符号字符

#include <iostream>
#include <string>
#include <sstream>

unsigned char hexStringToUnsignedChar(const std::string& hexString) {
  std::istringstream iss(hexString);
  iss >> std::hex >> std::noskipws;

  unsigned int value;
  iss >> value;

  if (iss.fail()) {
    // 转换失败的错误处理
    throw std::invalid_argument("Invalid hex string");
  }

  return static_cast<unsigned char>(value);
}

int main() {
  std::string hexString = "FF";
  
  try {
    unsigned char result = hexStringToUnsignedChar(hexString);
    std::cout << "转换结果: " << static_cast<int>(result) << std::endl;
  } catch (const std::exception& e) {
    std::cerr << "转换失败: " << e.what() << std::endl;
  }
  
  return 0;
}