UTF-8和Unicode互转

1、Unicode转UTF-8

 void CodeCovertTool::UNICODE_to_UTF8(const CString& unicodeString, std::string& str)

 {//Unicode转UTF8

     int stringLength = ::WideCharToMultiByte(CP_UTF8, NULL, unicodeString, wcslen(unicodeString), NULL, , NULL, NULL);

     char* buffer = new char[stringLength + ];

     ::WideCharToMultiByte(CP_UTF8, NULL, unicodeString, wcslen(unicodeString), buffer, stringLength, NULL, NULL);

     buffer[stringLength] = '\0';

     str = buffer;

     delete[] buffer;

 }

 std::string CodeCovertTool::UnicodeToUtf8(const wchar_t* buf)

 {//Unicode转UTF8

     int len = ::WideCharToMultiByte(CP_UTF8, , buf, -, NULL, , NULL, NULL);

     if (len == ) return "";

     std::vector<char> utf8(len);

     ::WideCharToMultiByte(CP_UTF8, , buf, -, &utf8[], len, NULL, NULL);

     return &utf8[];

 }  

2、UTF-8转Unicode

 std::wstring CodeCovertTool::Utf8ToUnicode(const char* buf)

 {//UTF8转Unicode

     int len = ::MultiByteToWideChar(CP_UTF8, , buf, -, NULL, );

     if (len == ) return _T("");

     std::vector<wchar_t> unicode(len);

     ::MultiByteToWideChar(CP_UTF8, , buf, -, &unicode[], len);

     return &unicode[];

 }  

 CString CodeCovertTool::Utf8ToUnicode(const std::string &utf8_str)

 {//UTF8转Unicode

     int len;

     len = MultiByteToWideChar(CP_UTF8, , (LPCSTR)utf8_str.c_str(), -, NULL,);

     WCHAR * wszUnicode = new WCHAR[len+];

     memset(wszUnicode, , len *  + );

     MultiByteToWideChar(CP_UTF8, , (LPCSTR)utf8_str.c_str(), -, wszUnicode, len);

     CString ss=wszUnicode;

     delete wszUnicode;

     return ss;

 }

3、Ansi转Unicode

 std::wstring CodeCovertTool::AnsiToUnicode(const char* buf)

 {//Ansi转Unicode

     int len = ::MultiByteToWideChar(CP_ACP, , buf, -, NULL, );

     if (len == ) return L"";

     std::vector<wchar_t> unicode(len);

     ::MultiByteToWideChar(CP_ACP, , buf, -, &unicode[], len);

     return &unicode[];

 }

4、Unicode转Ansi

 std::string CodeCovertTool::UnicodeToAnsi(const wchar_t* buf)

 {//Unicode转Ansi

     int len = ::WideCharToMultiByte(CP_ACP, , buf, -, NULL, , NULL, NULL);

     if (len == ) return "";

     std::vector<char> utf8(len);

     ::WideCharToMultiByte(CP_ACP, , buf, -, &utf8[], len, NULL, NULL);

     return &utf8[];

 }