The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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How to start up your Mac in Internet Recovery Mode

Posted by jpluimers on 2019/09/13

When all else fails: [WayBack] How to start up your Mac in Internet Recovery Mode.

Command-Option-R is one of the plethora of keyboard tricks you can use during boot:

Some Mac features are available by holding down certain keys during startup.

[WayBack] Startup key combinations for Mac – Apple Support

 

Hold during startup Description
Shift ⇧ Start up in Safe Mode.
Option ⌥ Start up to Startup Manager.
C Start up from a bootable CD, DVD, or USB thumb drive (such as OS X install media).
D Start up to either Apple Hardware Test or Apple Diagnostics, depending on which Mac you’re using.
Option-D Start up to either Apple Hardware Test or Apple Diagnostics over the Internet.
N Start up from a compatible NetBoot server.
Option-N Start up from a NetBoot server using the default boot image.
Command (⌘)-R Start up from OS X Recovery.
Command-Option-R Start up from OS X Recovery over the Internet.
Command-Option-P-R Reset NVRAM. Release the keys after you hear the startup sound again.
Command-S Start up in single-user mode.
T Start up in target disk mode.
X Start up from an OS X startup volume when the Mac would otherwise start up from a non-OS X startup volume.
Command-V Start up in verbose mode.
Eject (⏏), F12, mouse button, or trackpad button Eject removable media, such as an optical disc.

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Posted in Apple, Mac, Mac OS X / OS X / MacOS, MacBook, MacBook Retina, MacBook-Pro, OS X 10.11 El Capitan, OS X 10.9 Mavericks, Power User | Leave a Comment »

Happy Day of the Programmer!

Posted by jpluimers on 2019/09/13

Enjoy your day and [WayBack] Good Questions — Geek&Poke; [WayBack] The art of programming — Geek&Poke

 

 

 

–jeroen

Related: Happy Day of the Programmer! 2018

Posted in Development, Software Development | Leave a Comment »

What went wrong with the IT industry? Some interesting thoughts on other industries coping with complexity…

Posted by jpluimers on 2019/09/12

[WayBack] What went wrong with the IT industry? Well, maybe the same as what happened in other industries that deal with complexity. We maybe beat ourselves up to… – James Coplien – Google+ is on my list of videos to watch.

–jeroen

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Posted in Development, Software Development, Systems Architecture | Leave a Comment »

Delphi / Stefan Glienke: I looked into IntroSort … and the Microsoft implementation … Here is my current implementation

Posted by jpluimers on 2019/09/12

For my link archive: [WayBack] Delphi / Stefan Glienke: I looked into IntroSort … and the Microsoft implementation … Here is my current implementation

[WayBack] Delphi IntroSort by Stefan Glienke

–jeroen

https://bitbucket.org/snippets/sglienke/64LG6b/introsort

 

Posted in Delphi, Development, Software Development | Leave a Comment »

C# (and presumably Delphi): why parameterless record constructors are absent

Posted by jpluimers on 2019/09/12

For my link archive.

Full text at: [WayBack] … why the Delphi language does not allow parameterless constructors… – David Heffernan – Google+

Abstract:

+Stefan Glienke deleted his post about parameterless record constructors, presumably due to all the off topic comments.

…

.net at CLR level does allow parameterless constructors on structs. But the C# language bans them: https://msdn.microsoft.com/en-us/library/saxz13w4.aspx

Jon Skeet posted an answer on SO way back in 2008 on this topic: http://stackoverflow.com/a/333840/ From that answer:

—-
The CLR allows value types to have parameterless constructors, but C# doesn’t. I believe this is because it would introduce an expectation that the constructor would be called when it wouldn’t. For instance, consider this:

MyStruct[] foo = new MyStruct[1000];

…
—-

My guess is that Embarcadero decided to ban parameterless constructors on Delphi records for the same reason. Or perhaps they just copied the rules from C# without realising that the CLR supported parameterless struct constructors.

References:

--jeroen

Posted in .NET, C#, Delphi, Development, Jon Skeet, Software Development | Tagged: | Leave a Comment »

delphi: you can only access protected identifiers from parent classes in your own “Self” scope, or when you are “friends” with your parent (so you are in the same unit)

Posted by jpluimers on 2019/09/11

An interesting question from a while back: [WayBack] delphi – Should a descendant class’ method’s variable that is identical to Self, have access to its ancestor’s protected methods? – Stack Overflow

In unit A:

TParent = class
protected
  function DoSomething: TParent;
end;

In unit B:

TChild = class(TParent)
public
  procedure DoAnotherThing;
end;

implementation

procedure TChild.DoAnotherThing;
begin
  DoSomething.DoSomething
end;

…

This won’t compile, throwing a

cannot access protected symbol TParent.DoSomething

The kicker here is that the error message makes you think you are operating in Self context, but you are not as you are calling DoSomething.DoSomething where only the first DoSomething is in your Self context, but the second .DoSomethingis in the context of any TParent instance trying to access a public identifier.

Stefan Glienke posted [WayBack] a more elaborate answer explaining some workarounds.

–jeroen

Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »

Bouncer – Temporary App Permissions (Beta) – Apps on Google Play

Posted by jpluimers on 2019/09/11

Bouncer gives you the ability to grant permissions temporarily.

Want to tag a location or take a photo, but don’t want that app to be able to use the camera or get your location whenever it wants?

Bouncer gives you exactly that.As soon as you exit the app,

Bouncer will automatically remove the permission for you in an instant so you can get back to doing what you do best, without having to worry about apps invading your privacy and wasting your battery.

  • Increased security, privacy and battery life
  • Never have to worry what apps are doing in the background
  • No complicated setup needed (no root or adb)

…

Get it at [WayBack] Bouncer – Temporary App Permissions (Beta) – Apps on Google Play

Via:

–jeroen

Posted in Android Devices, Power User | Leave a Comment »

Firebird: RDB$RELATIONS.RDB$RELATION_TYPE and when it can be null

Posted by jpluimers on 2019/09/11

The RDB$RELATIONS.RDB$RELATION_TYPE was introduced in Firebird 2.1 with these enumeration values:

enum rel_t {
    rel_persistent = 0,
    rel_view = 1,
    rel_external = 2,
    rel_virtual = 3,
    rel_global_temp_preserve = 4,
    rel_global_temp_delete = 5
};

You should access it assuming NULL means zero (0), so you better treat it using [WayBack] COALESCE() like COALESCE(RDB$RELATIONS.RDB$RELATION_TYPE, 0).

Background information:

–jeroen

Posted in Database Development, Development, Firebird | Leave a Comment »

Is there a way to use the JVCL’s TJvXxxAppStorage to store float values as s…

Posted by jpluimers on 2019/09/10

For my link archive: [WayBack] Is there a way to use the JVCL’s TJvXxxAppStorage to store float values as strings (e.g. “10.152”) rather than hex dumps and also control the decimal s… – Thomas Mueller (dummzeuch) – Google+

Relevant sources:

–jeroen

 

Posted in Delphi, Development, Software Development | Leave a Comment »

MS Paint IDE

Posted by jpluimers on 2019/09/10

Oh boy:

Ditch IDEs like Intellij and glorified text editors like Eclipse, and switch to a real IDE, MS Paint.

It wraps around MS Paint.

You can get it at [WayBack] MS Paint IDE and source code at [WayBack] GitHub – RubbaBoy/MSPaintIDE: Programming in MS Paint.

A long thread discussing it, including a tutorial: [WayBack] Resource – Programming in MS Paint [UPDATED] | SpigotMC – High Performance Minecraft

–jeroen

Posted in Development, Fun, Software Development | Leave a Comment »

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