Archive for the ‘Conferences’ Category
Posted by jpluimers on 2023/01/12
[Wayback/Archive] SQLZOO has an extensive set of interactive tutorials spread over these topics:
- basic SQL tutorials gradually getting more difficult (including some Covid-19 materials)
- SQL “how to” style questions
- More involved examples from easy via medium to hard
- A White Christmas challenge
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:
- In my [Wayback/Archive] jpluimers/deadlockempire.github.io: The Deadlock Empire: Slay dragons, learn concurrency! repository, go to the Settings tab, then click on Pages:
DeadLockEmpire Settings tab, Pages configuration None.
Here you see “None” as value for the branch to be published as GitHub Pages.
- Here I have chosen the Branch “feature/Delphi-language-and-Delphi-RTL” to be published, and am about to press “Save” (full screenshot below):
DeadLockEmpire Pages selecting the correct branch
- After pressing “Save“, the site gets published (it takes about a minute for that to complete) at [Wayback/Archive] jpluimers.github.io/deadlockempire.github.io:
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.
Related DeadLockEmpire posts
- 2016 – If you thought you could do multi-threading, then play “The Deadlock Empire” games.
- 2017 – ThreadBarrier/ThreadBarrier.pas at master · lordcrc/ThreadBarrier
- 2020 – Davidlohr Bueso on Twitter: A programmer had a problem. He thought to himself, “I know, I’ll solve it with threads!”. has Now problems. two he
- [WayBack] One second code: Do YOU know how much your computer can do in a second? is a quiz version of the [WayBack] Numbers Every Programmer Should Know By Year. [WayBack] About this game revealed…Source: One second code: Do YOU know how much your computer can do in a second? « The Wiert Corner – irregular stream of stuff
Read the rest of this entry »
Posted in .NET, About, C#, Conference Topics, Conferences, Delphi, Development, Event, Personal, Software Development, Web Development | 1 Comment »
Posted by jpluimers on 2023/01/04
Another remote conference I missed while recovering from rectum cancer treatment, but luckily the playbacks are on YouTube and some slide decks are at Google Drive.
Via: [Archive] Uri Shaked on Twitter: “My talk on @hackaday Remoticon starting now Reverse Engineering the ESP32 WiFi Live stream: … “ / [Archive] Jeroen Wiert Pluimers on Twitter: “Dang. I copied that one out of the description. All the timestamps there are corrupted as YouTube measures them in minutes:seconds but @hackaday posted them as hours:minutes (which are off by minutes anyway) starting at 01:56:30. This is the correct one: … “
Links:
- Web site at [Wayback/Archive] 2021 Hackaday Remoticon
- Videos at [Wayback/Archive] HACKADAY – YouTube:
- Day 1: [Wayback/Archive] 2021 Hackaday Remoticon: Friday – YouTube
Approximate hour:minute time stamps as published for Friday
They are usually at least minutes off; substract 11:00 to get the rough hour:minute index into the video, then scroll from there.
- 11:00 Opening Remarks
- 11:10 Keynote – Elecia White: Map Files and Other Buried Treasures
- 12:10 Maurits Fennis: Hack for the Planet: Reverse Engineering Embedded Systems to Reduce E-Waste
- 13:00 Matt Venn: Open Source ASICs – A Year in Perspective
- 13:35 Hal Rodriguez and Sahrye Cohen: Conductive Melody: a Tech Couture Instrument
- 14:10 Jay Bowles: A Dip Into The Plasmaverse
- 15:00 Voja Antonic: Become a Hardware Expert in 40 Minutes
- 15:50 Sergiy Nesterenko: Don’t Flip My Bits: Electronics in Spaaaace
- 16:25 Jeroen Domburg: Rickrolling Buddha: A Deep Dive in Reverse Engineering and Thoroughly Pwning an Unknown Chip
- 17:15 Lewin Day: Hacker Trivia (Stream will automatically redirect to this one: [Wayback/Archive] youtu.be/uRpUdQi31tg )
- 18:00 Bring-a-Hack on Gather Town platform (details on joining sent to ticket holders and on the Discord server)
- Day 2: [Wayback/Archive] 2021 Hackaday Remoticon: Saturday – YouTube
Approximate hour:minute time stamps as published for Saturday
They are usually at least minutes off; substract 10:00 to get the rough hour:minute index into the video, then scroll from there.
- 10:00 Opening Remarks
- 10:10 Keynote – Keith Thorne: LIGO: The Most Sensitive Instrument Humans Ever Created Will Unfold the Mysteries of Gravitational Waves
- 11:10 Arsenijs Picugins: Laptop-Be-Done
- 12:00 Uri Shaked: Reverse Engineering the ESP32 WiFi
- 12:35 Hash Salehi: Smart Meter Hacking
- 13:10 Jay Doscher: Getting Started With and Outgrowing Tinkercad
- 14:00 Joey Castillo: Teaching An Old LCD New Tricks
- 14:35 Colin O’Flynn: Upskilling your Hardware Security Work
- 15:10 Rob Weinstein: Patently Obvious – Reverse Engineering a 45 Year Old Patent into a Fully-Functional HP-35 Replica
- 16:00 Debra Ansell: Form is Function: Modular PCB Building Blocks
- 16:35 Vaibhav Chhabra: M19 Initiative – A Case of Open Innovation & Distributed Manufacturing at Scale
- 17:25 Keynote – Jeremy Fielding: Building Hardware that Moves: the Fundamentals that Everyone Should Know
- 18:25 Hackaday Prize Ceremony
- 19:25 Closing Remarks
- 19:35 DJ Jackalope: Live Set (listen/watch on Twitch, chat with everyone on discord)
–jeroen
Posted in Conferences, Development, ESP32, Event, Hardware Development, Remoticon, Software Development | Leave a 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.
Delphi Style Guides
Style guides I found in the past as files named in those session materials:
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
http://www.dsdt.info/grundlagen/styleguide/
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
http://www.econos.de/delphi/cs.html
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
http://onelauter.com/codestandards/
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
http://gokmen.selcuk.edu.tr/document…/delphi/cs.php
Hier ist auch eine Liste mit Präfixen enthalten
- Delphi Identifier Naming Conventions
von Zarko Gajic
it made it into the WayBack machine
Dieser Artikel befasst sich nur mit der Benamung von Variablen
The dstgroup version is based on WayBack: onelauter.com/codestandards/CodeStandards.doc.
Mixed emotions conventions
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.
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:
–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:
Read the rest of this entry »
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 GarbageCollectAtoms in 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:
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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.
Read the rest of this entry »
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 »
Posted by jpluimers on 2022/08/16
A while back Kristian Köhntopp (isotopp) wrote a blog post after quite a Twitter argument where he poses against using git empty commits. I’m with Kris: don’t use them for anything, especially not for kicking off your CI/CD.
Basically his blog post is all about avoiding to think you have a golden hammer, and avoid falling for the Law of the instrument – Wikipedia.
Originally, Abraham Maslow said in 1966:
“I suppose it is tempting, if the only tool you have is a hammer, to treat everything as if it were a nail.”
For me this has all to do with preventing technical debt: find the right tool to kick your CI/CD pipeline after part of that chain somehow malfunctioned is way better than polluting the commit history with empty commits.
His blog post: [Wayback/Archive.is] Empty commits and other wrong tools for the job | Die wunderbare Welt von Isotopp
The most important bit in it:
And since we are talking about CI/CD pipelines: Don’t YAML them. Don’t JSON them. Don’t XML them.
…
Programming in any of these three is wrong use of tooling, and you should not do it.
- YAML, JSON and XML are for declarative things.
- Python, Go and Rust are for procedural things.
- Bash is for interactive use only.
Use the proper tooling for the job. Be an engineer.
This very much reminds me of an Entwickler Konferenz keynote a long time ago, where Neal Ford made the point that most software engineers act very much unlike what is expected from traditional engineering way of operating where the engineer is both responsible and liable for his actions.
The start of the Twitter thread: [Archive.is] Kristian Köhntopp on Twitter: “A lot of people right now that git is an API and triggering CI/CD pipelines with empty commits replaces the equivalent of a Kubernetes controller for their fragile pile of bash in git triggers. This is broken and begets more brokenness. Evidence:… “
The tweet that started the subtweet: [Archive.is] Florian Haas on Twitter: “(For anyone wondering, what’s nice about this one is it works in any CI. So you don’t have to remember how to manually kick off a GitLab CI pipeline or GitHub Action or Zuul job, you just push an empty commit and off you go.)”
Other relevant tweets:
Yes, you want to avoid shell too (anything like for instance sh, ash, dash, bash or zsh), but you have to know it (and understand why to avoid it) as often it is the only interactive way to access systems from the console.
And of course Kris also wrote a big document on that too, which is available as full PDF (Wayback), full HTML (Wayback) and chaptered HTML Die UNIX Shell /bin/sh.
But more importantly, Kris wrote [Wayback/Archive.is] Using Python to bash | Die wunderbare Welt von Isotopp which is about using Python to do things you might be tempted to do in the shell. It quotes
Shell is a thing you want to understand and then not use, because you learned to understand it.
which is from the German post in thread [Wayback/Archive.is] Bashprogrammierung, wo gehts am besten los which quotes Kris’ 1998 message:
From kris Tue Sep 1 11:26:12 1998
From: kris
Newsgroups: de.comp.os.unix.misc
Subject: Re: Shell-Frage, find, xargs, kopieren von vielen Dateien
References: <6seh24$q9a$2...@nz12.rz.uni-karlsruhe.de>
From: kr...@koehntopp.de (Kristian Koehntopp)
Alignment: chaotic/neutral
X-Copyright: (C) Copyright 1987-1998 Kristian Koehntopp -- All rights
reserved.
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
Marc.Hab...@gmx.de (Marc Haber) writes:
>mir ist das ganze Zeug mit der Shell, find, xargs und Konsorten noch
>reichlich verschlüsselt.
http://www.koehntopp.de/kris/artikel/unix/shellprogrammierung/
>xargs hin oder sollte ich besser ein Perlskript schreiben?
Verwende Perl. Shell will man koennen, dann aber nicht verwenden.
Kristian
–jeroen
Posted in *nix, *nix-tools, ash/dash, ash/dash development, bash, bash, Conference Topics, Conferences, Continuous Integration, Development, DVCS - Distributed Version Control, Event, git, Power User, Scripting, sh, Sh Shell, Software Development, Source Code Management, Technical Debt | Leave a Comment »
Posted by jpluimers on 2022/07/28
Easiest way to video call from your PC via WhatsApp is to use [Wayback/Archive] WhatsApp: Download – Mac or Windows PC.
This should be an alternative for Hangouts Video Calling as Hangouts is yet another product killed by Google as mentioned in many places for instance:
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Posted in About, Conference Topics, Conferences, Event, Google, GoogleHangouts, LifeHacker, Personal, Power User, SocialMedia, WhatsApp | Leave a Comment »
The Wiert Corner - irregular stream of stuff 