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Archive for December 6th, 2017

Oh nice. Feel free to QP. E2003WithConstsInDescendingClassesConsoleProject

Posted by jpluimers on 2017/12/06

Oh nice. Feel free to QP. Fails at least in Delphi XE8.

program E2003WithConstsInDescendingClassesConsoleProject;

{$APPTYPE CONSOLE}

uses
ParentUnit in 'ParentUnit.pas',
ChildUnit in 'ChildUnit.pas';

begin
end.
unit ParentUnit;

interface

type
  TParent = class
  // section can be strict protected, protected, public, published or nothing
  const
    InitialBooleanValue = False;
    InitialIntegerValue = -1;
  end;

implementation

end.
unit ChildUnit;

interface

uses
  ParentUnit;

type
  TChild = class(TParent)
  // section can be strict protected, protected, public, published or nothing
  const
//    Initial and final values need to be different to test the behaviour
    FinalBooleanValue = not InitialBooleanValue;
    FinalIntegerValue = InitialIntegerValue + 1;
//[dcc32 Error] ChildUnit.pas(13): E2003 Undeclared identifier: 'InitialBooleanValue'
//[dcc32 Error] ChildUnit.pas(14): E2003 Undeclared identifier: 'InitialIntegerValue'
//[dcc32 Error] ChildUnit.pas(14): E2026 Constant expression expected
  end;

implementation

end.

[WayBackOh nice. Feel free to QP. unit ParentUnit; interface type TParent = class …

Posted in Delphi, Delphi XE8, Development, Software Development | 3 Comments »

DNS, glue records and TTL

Posted by jpluimers on 2017/12/06

If I ever need to read why, here are the explanatory links:

TL;DR:

  • You need glue records for your domains if the nameserver is in the same TLD as your domain is (more explanation in the above links).
  • Your domain registrar allows you to change both your DNS servers and the glue at the TLD servers.
  • Glue records have a TTL at the TLD of 48 hours so changing them takes some waiting.
  • This is how you query the glue records so you can verify what’s setup at your DNS servers matches the ones at the TLD servers (in the below examples, replace google.com by your domain name).

dig +trace +additional google.com

 

Notes:

At the time of writing the dig output is this:

Read the rest of this entry »

Posted in DNS, Internet, Power User | Leave a Comment »

 
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