BOOL GetUserSID(CString &Sid)

 {

     HANDLE hProcess = GetCurrentProcess();

     if (hProcess)

     {

         HANDLE hToken;

         if (OpenProcessToken(hProcess, TOKEN_QUERY, &hToken) && hToken)

         {

             BYTE tagTokenInfoBuf[];

             PTOKEN_USER tagTokenInfo = (PTOKEN_USER)&tagTokenInfoBuf;

             if (GetTokenInformation(hToken, TokenUser, tagTokenInfoBuf, sizeof(tagTokenInfoBuf), NULL))

             {

                 LPTSTR MySid = NULL;

                 ConvertSidToStringSid(tagTokenInfo->User.Sid, &MySid);

                 Sid = MySid;

                 LocalFree(MySid);

                 return TRUE;

             }

             CloseHandle(hToken);

         }

         CloseHandle(hProcess);

     }

     return FALSE;

 }