Posted by jpluimers on 2023/02/15
Forgot to schedule this in 2014, so here it finally is, as the content is still relevant:
A long time ago (almost 10 years) I did some stuff with State Machines in .NET.
Since then the world has changed, and a lot more libraries have become available.
As I mainly use .NET and Delphi and there is a reasonable chance I need to do some more state machine work, here are some links about State Machines in both environments.
Posted in .NET, C#, Conference Topics, Conferences, Delphi, Development, Diagram, Event, Java, Java Platform, Software Development, UML | Leave a Comment »
Posted by jpluimers on 2023/01/17
After last week’s posts PostgreSQL Exercises and SQLZOO: Interactive SQL tutorials (no login required), I did a Twitter search:
This got me to [Wayback/Archive] The SQL Murder Mystery (which is fun!).
I got there via [Archive] Lætitia on Twitter: “@nthonynowocien I’d say pgexercises is a good start for SQL pgexercises.com Even though, the last exercises are not beginner level. The SQL murder mystery is more fun mystery.knightlab.com” / Twitter
–jeroen
Posted in Conference Topics, Conferences, Database Development, Development, Event, Software Development, SQL | 1 Comment »
Posted by jpluimers on 2023/01/13
I have had the below Archive.is spinner “Loading” without any progress indication on a couple of URLs the last few months and I think they are tied to having special characters in the URL-to-be-archived.
My usual workaround was to first archive in the Wayback Machine, then archive the resulting URL in Archive.is as it would automatically follow the path up to the original URL,
That of course failed when https://web.archive.org/web/*/vx-underground.org did not want to save in Archive.is: either these would give an eternal spinner on the “Loading” page no matter the browser you were using either the escaped %2A or *:
Posted in archive.is / archive.today, Conference Topics, Conferences, Event, Internet, InternetArchive, LifeHacker, Power User, WayBack machine | Leave a Comment »
Posted by jpluimers on 2023/01/12
[Wayback/Archive] SQLZOO has an extensive set of interactive tutorials spread over these topics:
So the above is kind of a continuation of my series of games to learn software and database development PostgreSQL Exercises.
I found it via the first reaction to [Archive] Steve Polito on Twitter: “If you’re like me and want to level up your SQL game, give PostgreSQL Exercises a try. …” / Twitter (which initiated yesterday’s post):
[Archive] Loumarven Payot on Twitter: “@stevepolitodsgn I’ve also tried sqlzoo.net. Almost done with it. Next on my list are dataschool.com and selectstarsql.com” / Twitter
Which means I’ve more sites to try.
These will be the next: [Wayback/Archive] Learn SQL: Interactive SQL Book, from dataschool and [Wayback/Archive] Select Star SQL (which is an interactive book that I should be able to finish in a day full of reading and experimenting).
–jeroen
Posted in Conference Topics, Conferences, Database Development, Development, Event, Software Development, SQL | 1 Comment »
Posted by jpluimers on 2023/01/10
A while ago I wrote about Setting up a GitHub project so it is served over https as a github.io and a custom subdomain.
Doing the full “host on your custom domain” route was a big tougher than I hoped for, so I totally forgot how easy it is to convert an existing HTML or markdown documentation repository to use GitHub pages without a custom domain.
I needed it for the Delphi version of the DeadLockEmpire (see links below, originally it was an interactive tutorial game focusing on the C# language and .NET runtime), as I am trying to get as much as my stuff published and hosted in a manner that will outlive me (I still have a pretty high chance of the rectum cancer metastases returning).
Enabling GitHub Pages on your repository is almost as easy as hosting a page through raw.githack.com (where I already hosted raw.githack.com/jpluimers/deadlockempire.github.io/feature/Delphi-language-and-Delphi-RTL/index.html as raw.githack.com/jpluimers/deadlockempire.github.io/feature/Delphi-language-and-Delphi-RTL/index.html and rawcdn.githack.com/jpluimers/deadlockempire.github.io/feature/Delphi-language-and-Delphi-RTL/index.html).
This is how easy it was to get it hosted as [Wayback/Archive] jpluimers.github.io/deadlockempire.github.io:
DeadLockEmpire Settings tab, Pages configuration None.
Here you see “None” as value for the branch to be published as GitHub Pages.
DeadLockEmpire Pages selecting the correct branch
DeadLockEmpire Pages the correct branch has been saved which will automagically publish it.
That was it. No more steps.
Each new commit in the selected branch will auto-publish as well.
Posted in .NET, About, C#, Conference Topics, Conferences, Delphi, Development, Event, Personal, Software Development, Web Development | 1 Comment »
Posted by jpluimers on 2022/11/30
A while ago, Uwe Raabe reminded me about the Delphi Style Guide which is on-line at the Embarcadero document wiki:
He reminded me to write a bit more about Delphi Style Guides, as there are a few and I used them on past conference sessions.
I thought either the blog post or the conference sessions were already online.
Nope, no 2010 conference sessions at [Wayback/Archive] jpluimers/Conferences: Materials for the conferences that Jeroen Wiert Pluimers spoke on., and no blog post yet.
Hopefully over time I will update that repository, but for now: here is a summary of Delphi Style Guides and a short hint on why to get naming conventions right.
I might extend both in a later blog post, health and time permitting.
Style guides I found in the past as files named in those session materials:
Delphi Identifier Naming Conventions.pdfThis is the “Delphi Identifier Naming Conventions” blog post on About.com by [Wayback/Archive] Žarko Gajić.
I originally saved it from delphi.about.com/od/standards/l/bldnc.htm, and luckily it made it into the WayBack machine.
Econos - Coding Standard Document.pdfThis was the style guide at by [Wayback/Archive] Stefan Hoffmeister and too archived into the Wayback machine
JCL Delphi Language Style Guide.pdfThis is now online as part of the JCL Wiki at [Wayback/Archive] Project JEDI Delphi Language Style Guide – Project JEDI Wiki.
Object Pascal Style Guide.pdfThis one is by [Wayback/Archive] Charlie (Charles) Calvert and still online at [Wayback/Archive] Object Pascal Style Guide.
Charlie has [Wayback/Archive] his own YouTube channel as well.
The above also made me find this interesting post: [Wayback/Archive] Delphi-PRAXiS – Einzelnen Beitrag anzeigen – Delphi Einrücken ::: ::: Wie rückt ihr ein? which mentions these style guides (I modified all links to point to the most recent WayBack machine version that is complete)):
- Borland empfiehlt folgende Formatierungsregeln:
http://community.borland.com/article/0,1410,10280,00.html
Der Punkt 3 “naming conventions” schweigt sich aber über Deine Frage aus- Deutsche Übersetzung der Borland Style Guides
Unsere Freunde von dsdt.info haben sich die Mühe gemacht und dem Text ins deutsche Übersetzt.
Damit gibt es nun keine Ausreden mehr sich nicht an die Richtlinien zu halten- Delphi 4 Developer’s Guide Coding Standards Document
von Econos – Stefan Hoffmeister (1998)
basiert auf dem Coding standard von Xavier Pacheco and Steve Teixeira
Hier gibt es auch eine Liste mit Präfixen zu den einzelnen Komponenten- Delphi Object Pascal Coding and Project Organization Standard
von Michael P. Hollis and Mark S. Lauter
Hier wird zwar auch nicht auf die Präfixe eingegangen, aber es wird unter anderem auch eine Verzeichnisstruktur vorgeschlagen.
Solch ein Dokument mit den einzuhaltenden Regeln sollte in jedem Projekt / Team existieren.- Delphi coding Standards
Maintained by Mustafa GÖKMEN
Hier ist auch eine Liste mit Präfixen enthalten- Delphi Identifier Naming Conventions
von Zarko Gajic
Dieser Artikel befasst sich nur mit der Benamung von Variablen
The dstgroup version is based on WayBack: onelauter.com/codestandards/CodeStandards.doc.
Anyway, this is the piece of code by Uwe Raabe that made me frown as it mixes two Delphi styles at once and uses improper meanings in names:
procedure TSearchForm.StartSearch; begin StatusBar.SimpleText := ''; dspFiles.Clear; Files.Clear; BeginSearch; SearchFolder(edtRootFolder.Text, edtSearchPattern.Text); EndSearch; end; procedure TSearchForm.SearchFolder(const APath, ASearchPattern: string); var arr: TArray; dir: string; begin arr := TDirectory.GetFiles(APath, ASearchPattern); AddFiles(arr); { release memory as early as possible } arr := nil; for dir in TDirectory.GetDirectories(APath) do begin if not TDirectory.Exists(dir) then Continue; SearchFolder(dir, ASearchPattern); end; end; procedure TSearchForm.AddFiles(const AFiles: TArray); begin Files.AddStrings(AFiles); dspFiles.Items.Count := Files.Count; StatusBar.SimpleText := Format('%d files found', [Files.Count]); end;
This is the start of technical debt, and resulted in the below cool Twitter thread.
Note that I intentionally used “Digital Signal Processor” as dsp abbreviations are very context sensitive, causing truckloads of problems especially when switching between functionality at front and technical stuff at front in naming conventions.
Functionally, it could have made very much sense to add files into a list to be passed onto a Digital Signal Processor for pre- or post-processing of signals.
sel for Select used radiogroups or comboboxes. I prefer to prefix the usage and not the control type.… “TSearchForm name, and thought “Yay, finally someone else getting the very useful naming convention which puts technology at the end and goes without abbreviations”. Then came dsp and other shortcuts in the mix. Bummer (;… “Uwe uses this Style Guide (which regrettably does not pay tribute to the original author):
So yes, Uwe posted a cool example on how to apply technology properly, and I retweeted it as this: [Archive] Jeroen Wiert Pluimers on Twitter: “Async Tasks in VCL Projects. Cool example on how to properly to Async in VCL. Important thought: please do not mix naming conventions like Uwe does, as it is substantially adds to your technical debt.… “
It is also a reminder for me to phrase this into the positive form: stick to one naming convention as it makes less technical debt creep in. Like Uwe, I learn new things every day and be reminded it is hart to not follow old habbits.
–jeroen
Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »
Posted by jpluimers on 2022/11/16
A long time ago, I posted one of the answers to [Wayback/Archive] Where can I find a comprehensive list of Delphi “compiler magic” declarations? – Stack Overflow
So for my link archive, these are the main ways of assembling an (always incomplete, as only partially documented) list:
System.pas filtered on lines close to “built-in types” and “compiler magic”, containing:
EXTERNALSYM OBJTYPENAME NODEFINE $IFDEF $ELSE$ENDIF$IFEND_ and @ prefixes to method names in DCU files.
–jeroen
Posted in Conference Topics, Conferences, Delphi, Development, EKON, Event, Software Development, Undocumented Delphi | Leave a Comment »
Posted by jpluimers on 2022/10/27
I knew there was JSFiddle for live playing around with JavaScript and more in your browser, so I wondered if there was a similar site for databases and SQL queries.
There are, so here are a few database fiddle sites: SQL playgrounds where you can live play with SQL queries (sometimes even without an underlying example database).
All via [Wayback/Archive.is] database fiddle – Google Search:
Posted in Conference Topics, Conferences, Database Development, DB2, Development, Event, Firebird, JavaScript/ECMAScript, JSFiddle, MariaDB, MySQL, OracleDB, PL/SQL, PostgreSQL, Scripting, Software Development, SQL, SQL Server, SQLite, T-SQL | Leave a Comment »
Posted by jpluimers on 2022/10/20
Last week I found out that I had some Windows ATOM issues before, but this beats them easily was still a draft in stead if in the blog queue.
I got reminded to it by someone asking on Telegram about
“Do I need to use
GarbageCollectAtomsin Delphi? I used it in delphi 7, but I dont know what is benefit. 😐”.
The short answer is: yes, if your Delphi application does terminate in a way that the Controls unit cannot cleanly unload (and cannot free the Windows atoms) or leaks Windows atoms in a different way. I have been in that situation and that’s why I wrote the above blog post that got published in 2016.
The longer answer is likely no, both the Windows atom and registered Windows message table share a heap and that registered VCL Windows message leaking bug got fixed some 10 years ago in Delphi XE2, see:
Posted in Conference Topics, Conferences, Delphi, Development, Event, Power User, Software Development, Windows, Windows 10, Windows 7, Windows 8, Windows 8.1, Windows NT, Windows Server 2000, Windows Server 2003, Windows Server 2003 R2, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Vista, Windows XP | Leave a Comment »
Posted by jpluimers on 2022/08/31
Especially on Archive, but also on Android and other mobile operating systems, mobile apps can have their in-app browsers to circumvent the OS provided wrapper around the system browser.
On iOS, the Safari is the only system browser engine whereas on Android you can have other engines too, so less Android applications have in-app browsers.
Most of those in-app browsers are in social media applications that go to great length to keep their users inside a walled garden.
The site [Wayback/Archive] inAppBrowser.com helps checking how severely information is leaked through the in-app browser as those potentially have a lot of control. TikTok is worst capturing all input including credentials like user names and passwords.
Posted in Chrome, Conference Topics, Conferences, Development, Event, Firefox, iOS Development, JavaScript/ECMAScript, Mobile Development, Power User, Privacy, Safari, Scripting, Security, Software Development, Web Browsers, Web Development | Leave a Comment »
The Wiert Corner - irregular stream of stuff 