C++编码转换函数整理
2016-06-29 16:12
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原文:http://www.2cto.com/database/201411/354891.html
//UTF-8转Unicode std::wstring Utf82Unicode(const std::string& utf8string) { int widesize = ::MultiByteToWideChar(CP_UTF8, 0, utf8string.c_str(), -1, NULL, 0); if (widesize == ERROR_NO_UNICODE_TRANSLATION) { throw std::exception("Invalid UTF-8 sequence."); } if (widesize == 0) { throw std::exception("Error in conversion."); } std::vector<wchar_t> resultstring(widesize); int convresult = ::MultiByteToWideChar(CP_UTF8, 0, utf8string.c_str(), -1, &resultstring[0], widesize); if (convresult != widesize) { throw std::exception("La falla!"); } return std::wstring(&resultstring[0]); }
//unicode 转为 ascii string WideByte2Acsi(wstring& wstrcode) { int asciisize = ::WideCharToMultiByte(CP_OEMCP, 0, wstrcode.c_str(), -1, NULL, 0, NULL, NULL); if (asciisize == ERROR_NO_UNICODE_TRANSLATION) { throw std::exception("Invalid UTF-8 sequence."); } if (asciisize == 0) { throw std::exception("Error in conversion."); } std::vector<char> resultstring(asciisize); int convresult =::WideCharToMultiByte(CP_OEMCP, 0, wstrcode.c_str(), -1, &resultstring[0], asciisize, NULL, NULL); if (convresult != asciisize) { throw std::exception("La falla!"); } return std::string(&resultstring[0]); }
//utf-8 转 ascii string UTF_82ASCII(string& strUtf8Code) { string strRet(""); //先把 utf8 转为 unicode wstring wstr = Utf82Unicode(strUtf8Code); //最后把 unicode 转为 ascii strRet = WideByte2Acsi(wstr); return strRet; }
//ascii 转 Unicode wstring Acsi2WideByte(string& strascii) { int widesize = MultiByteToWideChar (CP_ACP, 0, (char*)strascii.c_str(), -1, NULL, 0); if (widesize == ERROR_NO_UNICODE_TRANSLATION) { throw std::exception("Invalid UTF-8 sequence."); } if (widesize == 0) { throw std::exception("Error in conversion."); } std::vector<wchar_t> resultstring(widesize); int convresult = MultiByteToWideChar (CP_ACP, 0, (char*)strascii.c_str(), -1, &resultstring[0], widesize); if (convresult != widesize) { throw std::exception("La falla!"); } return std::wstring(&resultstring[0]); }
//Unicode 转 Utf8 std::string Unicode2Utf8(const std::wstring& widestring) { int utf8size = ::WideCharToMultiByte(CP_UTF8, 0, widestring.c_str(), -1, NULL, 0, NULL, NULL); if (utf8size == 0) { throw std::exception("Error in conversion."); } std::vector<char> resultstring(utf8size); int convresult = ::WideCharToMultiByte(CP_UTF8, 0, widestring.c_str(), -1, &resultstring[0], utf8size, NULL, NULL); if (convresult != utf8size) { throw std::exception("La falla!"); } return std::string(&resultstring[0]); }
//ascii 转 Utf8 string ASCII2UTF_8(string& strAsciiCode) { string strRet(""); //先把 ascii 转为 unicode wstring wstr = Acsi2WideByte(strAsciiCode); //最后把 unicode 转为 utf8 strRet = Unicode2Utf8(wstr); return strRet; }
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