c++ - 中文字符乱码问题

[ooolky]

• 步骤

  • 传输和保存时要用utf8格式，显示和绘制时要用gbk格式。

    
    std::string GBKToUTF8(const std::string& gbk_str) {
    int utf8_length = MultiByteToWideChar(CP_ACP, 0, gbk_str.c_str(), -1, nullptr, 0);
    if (utf8_length == 0) {
      std::cerr << "MultiByteToWideChar failed" << std::endl;
      return "";
    }
    
    wchar_t* utf8_buffer = new wchar_t[utf8_length];
    MultiByteToWideChar(CP_ACP, 0, gbk_str.c_str(), -1, utf8_buffer, utf8_length);
    
    int utf8_bytes = WideCharToMultiByte(CP_UTF8, 0, utf8_buffer, -1, nullptr, 0, nullptr, nullptr);
    if (utf8_bytes == 0) {
      std::cerr << "WideCharToMultiByte failed" << std::endl;
      delete[] utf8_buffer;
      return "";
    }
    
    char* utf8_str = new char[utf8_bytes];
    WideCharToMultiByte(CP_UTF8, 0, utf8_buffer, -1, utf8_str, utf8_bytes, nullptr, nullptr);
    
    std::string result(utf8_str);
    delete[] utf8_buffer;
    delete[] utf8_str;
    
    return result;
    }

  std::string UTF8ToGBK(const std::string& utf8_str) { // 计算需要的缓冲区大小 int wide_char_length = MultiByteToWideChar(CP_UTF8, 0, utf8_str.c_str(), -1, nullptr, 0);

  if (wide_char_length == 0) { std::cerr << "MultiByteToWideChar failed" << std::endl; return ""; }

  wchar_t* wide_str = new wchar_t[wide_char_length];

  // 转换为宽字符 if (MultiByteToWideChar(CP_UTF8, 0, utf8_str.c_str(), -1, wide_str, wide_char_length) == 0) { std::cerr << "MultiByteToWideChar failed" << std::endl; delete[] wide_str; return ""; }

  // 计算需要的缓冲区大小 int gbk_char_length = WideCharToMultiByte(CP_ACP, 0, wide_str, -1, nullptr, 0, nullptr, nullptr);

  if (gbk_char_length == 0) { std::cerr << "WideCharToMultiByte failed" << std::endl; delete[] wide_str; return ""; }

  char* gbk_str = new char[gbk_char_length];

  // 转换为GBK if (WideCharToMultiByte(CP_ACP, 0, wide_str, -1, gbk_str, gbk_char_length, nullptr, nullptr) == 0) { std::cerr << "WideCharToMultiByte failed" << std::endl; delete[] wide_str; delete[] gbk_str; return ""; }

  delete[] wide_str;

  // 输出转换后的GBK字符串 std::string gbk_string(gbk_str); delete[] gbk_str;

  return gbk_string; }