Posted by jpluimers on 2017/11/29
Good news the Press-This bookmarklet on WordPress.com has been reinstated.
See https://github.com/WordPress/press-this/pull/29 and the discussions in these below threads and sources.
Solves issues:
Some relevant sources:
Posted in Bookmarklet, Development, Power User, SocialMedia, Software Development, Web Browsers, Web Development, WordPress, WordPress | Leave a Comment »
Posted by jpluimers on 2017/11/29
Though I try to refrain from using the singleton pattern when possible (I prefer dependency injection over accessing “globals” that usually tend up to be not so global after all), sometimes I need to.
In C# there has been a canonical singleton pattern implementation by John Skeet for a very long time at [WayBack] C# in Depth: Implementing the Singleton Pattern.
I just found out there has been similar implementations in Delphi both in this question (which like many useful questions is marked “closed”, oh the joy of StackOverflow): [WayBack] “Delphi Singleton Pattern – Stack Overflow:
I like both implmentation, but usually take the first as mostly locking has little overhead and sometimes two instances cannot co-exist (though that’s lessened when part of the singleton uses lazy initialisation, for instance from Spring4D).
–jeroen
via: [WayBack] May I please ask for your opinion on the following code:..singleton… – John Kouraklis – Google+
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Posted by jpluimers on 2017/11/29
Sometimes the title of a G+ entry looks not so interesting, but then you read the comments. In this cast it’s about the mediator pattern support in the tiOPF object persistence framework, how it works very well from Free Pascal and both classic and modern Delphi compilers and why developers dislike ARC. It’s cool as it allows you to decouple UI from business logic and separate out business logic from your application into a back-end. Recommended reading: [WayBack] Hello i have a program that use MS SQL SERVER 2000i want to make a mobile application that connect to this database to make some consultationclient fi… – Mohammed Bouhlal – Google+
–jeroen
Posted in Delphi, Development, FreePascal, Pascal, Software Development | Leave a Comment »
Posted by jpluimers on 2017/11/29
A very interesting course: [WayBack] Want to learn how to “Automate the Boring Stuff with Python”? Check out this reddit post by Al Sweigart for free access to his online course on Udemy… – ThisIsWhyICode – Google+
If you get it before 20171201, then you can still access it for free after that date.
If you get it later, then you pay either USD 50, or USD 10; see this reddit fragment:
[WayBack] I’m releasing a free code for the “Automate the Boring Stuff with Python” Udemy course
Use this link to sign up for the “Automate the Boring Stuff with Python” Udemy online course: https://www.udemy.com/automate/?couponCode=PY_ALL_THE_THINGS
It’s free until the end of Friday, Dec 1, 2017. Afterwards it goes back to its normal $50 price. (Though you can use this link https://www.udemy.com/automate/?couponCode=FOR_LIKE_10_BUCKS to buy it for $10. And it’s an open secret that if you browse Udemy in privacy mode, they’ll show you the discount price to lure in a “new” customer. But course creators get a much larger cut when people use their referral codes.)
The course follows the book of the same name, which is available for free, in full, at [WayBack] https://automatetheboringstuff.com under a Creative Commons license. (Which I encourage you to use to share your own creative works.)
The course is 50 videos and made for people with no previous programming experience. The first 15 videos are free to view on YouTube: https://www.youtube.com/watch?v=1F_OgqRuSdI&list=PL0-84-yl1fUnRuXGFe_F7qSH1LEnn9LkW
And now I will go self-flagellate to atone for my part in legitimizing “cyber monday”.
–jeroen
Posted in Development, Python, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2017/11/28
Interesting writeup as Lazarus and Free Pascal have come a long way: [WayBack] Kriscode.Hint := ‘Kris”s coding blog’: Lazarus IDE on ARM Ubuntu (Raspberry Pi, Ubuntu Touch, etc)
Via:
–jeroen
Posted in Development, FreePascal, Lazarus, Pascal, Software Development | Leave a Comment »
Posted by jpluimers on 2017/11/28
I think it was Stefan Glienke who pointed me at the Memoisation pattern: [WayBack] Implementing Memoize in Delphi 2009 – Community Blogs – Embarcadero Community
Or in laymans terms: caching with generic functions and dictionaries.
Note the Archive.is link is way better readable than the WayBack link, so below I’ve saved parts only in Archive.is.
It points to two other interesting reads:
Later I found it was indeed Stefan who pointed me to the above links and also came up with this very small Memoisation example which is based on Spring4D:
and guess what? because we have interfaced based dictionary this is super easy, let me just hack an example, 5mins6:52 PM
function BuildCache: Tfunc<string,string>; var cache: IDictionary<string,string>; begin cache := TCollections.CreateDictionary<string,string>; Result := function(s: string): string begin if not cache.TryGetValue(s, Result) then begin Sleep(1000); // hard work! ;) Result := ReverseString(s); cache.Add(s, Result); end; end; end;Since the returned anonymous method captures the dictionary its kept inside and once the anonymous method goes out of scope the dictionary is also cleaned, want to reset the cache? Just create a new one and throw the old one away.
Need thread safety? just add
System.TMonitoy.Enter/Leave(cache.AsObject);
–jeroen
Posted in Delphi, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2017/11/23
[WayBack] Use operator overloading for classes with non-ARC compiler · GitHub
The trick: do not use class operator but use class function &&op_ with the special operator name in the table referenced below. Just follow the bulleted example links to get an idea.
Bonus: it works on class helper constructs as well.
Officially this unsupported and with the non-ARC compiler you will have a risk of memory leaks.
But it’s so much fun as these links prove:
Posted in Delphi, Development, Software Development | 1 Comment »
Posted by jpluimers on 2017/11/23
[WayBack] Capitalization Conventions
Posted in .NET, Delphi, Development, Software Development | 1 Comment »
Posted by jpluimers on 2017/11/22
Thanks Uwe for the below code!
I was in a situation of a batch file running from a Task Scheduler that got broken because the user suddenly turned on persistent network connections.
So I needed to check if a shared drive-letter was indeed persistent or not and act accordingly.
The below code helped me merging the batch file with the Delphi application it would run in the background anyway.
It’s way better than checking of the global “persistence” flag for new connections has been set in the registry: [WayBack] SaveConnections flag at HKCU\Software\Microsoft\Windows NT\CurrentVersion\Network\Persistent Connections (which is reflected both in the Windows UI and settable via net use /Persistent).
Source: check if network connection is permanent
Via: [WayBack] Anyone who can share how one can query if a drive letter mapping to a share is persistent across logon sessions? (yes, this is Windows, I know) – Jeroen Wiert Pluimers – Google+
–jeroen
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Posted by jpluimers on 2017/11/21
A post of some older Delphi stuff I did in the past just in case need it again.
David Heffernan found the documentation for this: [WayBack] Structured Types (Delphi): Dynamic Arrays – RAD Studio
Since I needed a dynamic array structure supporting a non-zero lower bound, I was glad he also provided an answer with a data structure that does provide a non-zero lower bound.
For my own reference I’ve put his answers and questions below (as it’s way easier to search my blog than the complete internet) and my own implementation:
Posted in Delphi, Development, History, Software Development | 10 Comments »
The Wiert Corner - irregular stream of stuff 