ASCII,UTF-8,Unicode字串相互轉換

#include<string>#include<windows.h>#include<vector>using namespace std;//utf8 轉 Unicodestd::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 轉為 asciistd::string WideByte2Acsi(std::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 轉 asciistd::string UTF_82ASCII(std::string& strUtf8Code){std::string strRet("");//先把 utf8 轉為 unicodestd::wstring wstr = Utf82Unicode(strUtf8Code);//最後把 unicode 轉為 asciistrRet = WideByte2Acsi(wstr);return strRet;}/////////////////////////////////////////////////////////////////////////ascii 轉 Unicodestd::wstring Acsi2WideByte(std::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 轉 Utf8std::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 轉 Utf8std::string ASCII2UTF_8(std::string& strAsciiCode){std::string strRet("");//先把 ascii 轉為 unicodestd::wstring wstr = Acsi2WideByte(strAsciiCode);//最後把 unicode 轉為 utf8strRet = Unicode2Utf8(wstr);return strRet;}