MFC格式转换 UTF8 ANSI UNICODE

函数拿起来就可以用

参数说明：sChartSet : FromANSI(ANSI->UNICODE) , ToANSI (UNICODE->ANSI) , FromUTF8 (UTF8->UNICODE) , ToUTF8 (UNICODE->UTF8)

CString CSqlConTestDlg::UnicodeCovert(CString sSourceStr , CString sCharSet)

{

         bool bToUnicode = true;

         if(!strnicmp(sCharSet,"To",2))

         {

                   sCharSet = sCharSet.Mid(2);

                   bToUnicode = FALSE;

         }

         else if(!strnicmp(sCharSet,"From",4))

         {

                   sCharSet = sCharSet.Mid(4);

         }

         else

         {

                   return "";

         }

         UINT nCodePage = CP_ACP;

         if(stricmp(sCharSet,"ANSI") == 0 || stricmp(sCharSet,"ACP") == 0)

                   nCodePage = CP_ACP; //ANSI translation

         else if(stricmp(sCharSet,"UTF8") == 0)

                   nCodePage = CP_UTF8; //UTF8 translation

         else

                   return "";

         CString sCovert;

         if(bToUnicode) //->Unicode

         {

                   DWORD nWideBuf = MultiByteToWideChar(nCodePage , 0 , (LPCTSTR)sSourceStr , sSourceStr.GetLength(),NULL,0); //探测转成Unicode的长度

                   sCovert.GetBufferSetLength(nWideBuf*2);

                   MultiByteToWideChar(nCodePage,0,(LPCTSTR)sSourceStr,sSourceStr.GetLength(),(LPWSTR)LPCTSTR(sCovert),nWideBuf);

         }

         else //Unicode - >

         {

                   DWORD nWideCount = (sSourceStr.GetLength() + 1) * 2;

                   if(nWideCount == 0)

                            sCovert.Empty();

                   else

                   {

                            int nMultilen = WideCharToMultiByte(nCodePage, 0 , (LPWSTR)LPCTSTR(sSourceStr),nWideCount,sCovert.GetBufferSetLength(nWideCount),0);

                            sCovert.GetBufferSetLength(nMultilen);

                   }

         }

         return sCovert;

}