text: #ifndef _TRANSCODING_HPP
  #define _TRANSCODING_HPP
  
  #include <string>
  
  constexpr const char* const STRING_ERROR("字符串转换失败");
  constexpr const char* const URL_ENCODE_ERROR("url encoded error");
  constexpr const char* const URL_ESCAPE_ERROR("Unicode escape error");
  
  
  const std::wstring StringToWstring(const std::string& str);
  const std::string WstringToString(const std::wstring& str);
  
  const std::string ChineseURLEncode(const std::string& str);
  const std::string Unicode_escape(const std::string& str);
  
  const std::string GBKToUTF8(const std::string& str);
  
  
  #endif
  