如何判断当前用户是否是超级用户

主要代码如下：
BOOL IsAdmin()
{
   HANDLE hToken;
   DWORD  dwStatus;
   DWORD  dwAccessMask;
   DWORD  dwAccessDesired;
   DWORD  dwACLSize;
   DWORD  dwStructureSize = sizeof(PRIVILEGE_SET);
   PACL   pACL            = NULL;
   PSID   psidAdmin       = NULL;
   BOOL   bReturn         = FALSE;

   PRIVILEGE_SET   ps;
   GENERIC_MAPPING GenericMapping;

   PSECURITY_DESCRIPTOR     psdAdmin           = NULL;
   SID_IDENTIFIER_AUTHORITY SystemSidAuthority = SECURITY_NT_AUTHORITY;
  
   __try {

      // AccessCheck() requires an impersonation token.
      ImpersonateSelf(SecurityImpersonation);

      if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, FALSE,
            &hToken)) {

         if (GetLastError() != ERROR_NO_TOKEN)
            __leave;

         // If the thread does not have an access token, we'll
         // examine the access token associated with the process.
         if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY,
               &hToken))
            __leave;
      }

      if (!AllocateAndInitializeSid(&SystemSidAuthority, 2,
            SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS,
            0, 0, 0, 0, 0, 0, &psidAdmin))
         __leave;

      psdAdmin = LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
      if (psdAdmin == NULL)
         __leave;

      if (!InitializeSecurityDescriptor(psdAdmin,
            SECURITY_DESCRIPTOR_REVISION))
         __leave;
  
      // Compute size needed for the ACL.
      dwACLSize = sizeof(ACL) + sizeof(ACCESS_ALLOWED_ACE) +
            GetLengthSid(psidAdmin) - sizeof(DWORD);

      // Allocate memory for ACL.
      pACL = (PACL)LocalAlloc(LPTR, dwACLSize);
      if (pACL == NULL)
         __leave;

      // Initialize the new ACL.
      if (!InitializeAcl(pACL, dwACLSize, ACL_REVISION2))
         __leave;

      dwAccessMask= ACCESS_READ | ACCESS_WRITE;
      
      // Add the access-allowed ACE to the DACL.
      if (!AddAccessAllowedAce(pACL, ACL_REVISION2,
            dwAccessMask, psidAdmin))
         __leave;

      // Set our DACL to the SD.
      if (!SetSecurityDescriptorDacl(psdAdmin, TRUE, pACL, FALSE))
         __leave;

      // AccessCheck is sensitive about what is in the SD; set
      // the group and owner.
      SetSecurityDescriptorGroup(psdAdmin, psidAdmin, FALSE);
      SetSecurityDescriptorOwner(psdAdmin, psidAdmin, FALSE);

      if (!IsValidSecurityDescriptor(psdAdmin))
         __leave;

      dwAccessDesired = ACCESS_READ;

      //
      // Initialize GenericMapping structure even though we
      // won't be using generic rights.
      //
      GenericMapping.GenericRead    = ACCESS_READ;
      GenericMapping.GenericWrite   = ACCESS_WRITE;
      GenericMapping.GenericExecute = 0;
      GenericMapping.GenericAll     = ACCESS_READ | ACCESS_WRITE;

      if (!AccessCheck(psdAdmin, hToken, dwAccessDesired,
            &GenericMapping, &ps, &dwStructureSize, &dwStatus,
            &bReturn)) {
         printf("AccessCheck() failed with error %lu\n", GetLastError());
         __leave;
      }

      RevertToSelf();
  
   } __finally {

      // Cleanup
      if (pACL) LocalFree(pACL);
      if (psdAdmin) LocalFree(psdAdmin);  
      if (psidAdmin) FreeSid(psidAdmin);
   }

   return bReturn;
}

测试环境：win2k adv + vc6.0 + vsp5.0

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