Atrribute in AD is has a Datatype = largeinteger

Hi experts.

I'm trying to get the atrribute "lastLogonTimestamp" and it is a date from activedirectory by using SQL syntax. The date is a largeinteger datatype.

I do not know how to get the data from AD into something useful.

I have tried to do this:

var
bigint : int64

begin
  try
    ADOQuery4.SQL.Clear;
    ADOQuery4.SQL.Text := 'SELECT operatingSystem, lastLogonTimestamp FROM '+ Quotedstr('LDAP://OU=COMPUTERS,OU='+copy(ComputerNavn,3,2)+',OU='+copy(ComputerNavn,1,2)+',OU=FIRM,DC=AD,DC=FIRM,DC=ORG') + ' WHERE cn = '+ QuotedStr(ComputerNavn);
    ADOQuery4.Open;
    bigint := ADOQuery4.FieldByName('lastLogonTimestamp').AsLargeInt;
  finally
    ADOQuery4.Close;
  end;
end;

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but I get this error:


'Could not convert variant of type (Dispatch) into type (Boolean)'