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

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Archive for August, 2020

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How-to Make Your Own 3D Printing Goo

Posted by jpluimers on 2020/08/07

Smart idea: [WayBack] How-to Make Your Own 3D Printing Goo.

It is a large (22g) Elmer’s glue stick dissolved into a cup of warm water.

After applying it with a paper towel, the 3D print sticks to the warm printing bed well, but comes off easily from a cold printing bed.

It is quite easy to make. 1 cup water and 1 large 22g Elmers glue stick. I put both in water and let sit thinking it would dissolve on its own. After several hours I got impatient and put it in the microwave and heated it.(45 seconds I think). That did the trick and was only left with a few big clumps that I broke apart with my fingers to finish the dissolving.

To apply I just dip a paper towel in the solution and wipe on the bed. It leaves an extremely light layer of glue on the bed that PLA sticks very well to. When the bed cools the parts have very light adhesion to the bed. If the bed is hot it takes some force to get off.

[WayBack] Elmer’s School Glue Naturals® 1 pack 22g Glue Stick | All Natural Glue

Via: [WayBack] Recipe to make goo for 3D printer bed.  – Jean-Luc Aufranc – Google+

–jeroen

Posted in 3D printing, Power User | Leave a Comment »

Working on High Quality Low Cost DIY 3D Scanning using Structured Light

Posted by jpluimers on 2020/08/07

On my list of things to try: [WayBack] Working on High Quality Low Cost DIY 3D Scanning using Structured Light

Via: [WayBack] Karl has started looking into cheaper – yet accurate – DIY solutions for 3D scanning using structured light scanning… – Jean-Luc Aufranc – Google+

–jeroen

Posted in 3D printing, LifeHacker, Power User | Leave a Comment »

Friday Tip: create a permalink to a specific slide

Posted by jpluimers on 2020/08/07

[WayBack] Friday Tip: create a permalink to a specific slide: just append / followed by the side number.

Same at [Archive.is] How to link to a specific slide on Slideshare – Quora

–jeroen

Read the rest of this entry »

Posted in LifeHacker, Power User | Leave a Comment »

How to rename git local & remote branches, and local & remote tags

Posted by jpluimers on 2020/08/06

Since I keep forgetting the difference and order between renaming branches and tags.

Note you need to repeat the origin steps for each remote!

[WayBack] How to rename git local and remote branches:

git branch -m old_branch new_branch # Rename branch locally
git push origin :old_branch # Delete the old branch
git push --set-upstream origin new_branch # Push the new branch, set local branch to track the new remote

Like tags below, be aware of the implications when renaming branches: if you pushed before other users already can have the old branch and have acted upon it.

[WayBack] git tag – How do you rename a Git tag? – Stack Overflow:

old^{}
git tag -d old
git push origin :refs/tags/old
git push origin refs/tags/new

Be aware, of the [WayBack] implications that a Git Tag change has to consumers of a package!

Note the first step is not just a plain git tag new old

The reason is that this will create a tag new pointing to the tag old, failing to point to the actual commit behind old. A more detailed explanation, including how to better handle renames, is at [WayBack] git tag – Why isn’t my tag listed when I checkout with Git GUI? – Stack Overflow

–jeroen

Posted in Development, DVCS - Distributed Version Control, git, Software Development, Source Code Management | Leave a Comment »

Great tool: the Toptal Colorblind Web Page Filter

Posted by jpluimers on 2020/08/06

Colorblind Web Page Filter

Colorblind Web Page Filter

A great tool I found out about a while ago [Archive.is] Toptal Color Blind Filter.

It shows the original web page and the rendering for various types of color blindness:

  • protan -> Protanopia: red/green color blindness; anomalous red cones
  • deutan -> Deutanopia: red/green color blindness; anomalous green cones
  • tritan -> Tritanopia: blue/yellow color blindness; anomalous blue cones
  • grey -> Greyscale/achromatopsia: quick check for all forms of colorblindness

Because of a comment at [WayBack] Forums… https://embarcaderomonitoring.wiert.me/ – JWP – Google+, I used Toptal to notify Uptime robot that their status pages are hard for color blind people: [WayBack] Jeroen Pluimers on Twitter: “Some color blind people indicated to me that @uptimerobot status pages are hard for them to read. Examples are for @EmbarcaderoTech as they have subdomains being offline often: …”, so lets look at how people with various types of color blindness see embarcaderomonitoring.wiert.me :

Read the rest of this entry »

Posted in *nix, Color (science), Color (software development), Development, Monitoring, Power User, science, Software Development, Uptimerobot, Usability, User Experience (ux), Web Development | Leave a Comment »

Android passwords: store as transient as possible using arrays in stead of strings

Posted by jpluimers on 2020/08/06

Sometimes you cannot avoid handling passwords in your application. When you do,

  • keep them around as short as possible
  • store them in data types that are not garbage collected
  • wipe the storage as soon as you are done

In practice, this usually comes down to storing them as arrays (character or byte arrays), not strings.

This holds for many other platforms outside Java as well: strings are usually managed in one way or the other, so they cannot be wiped

References:

For actual storage of passwords, you always have the risk of retrieval: when a “bad guy” gets physical access to a device, it is basically hosed.

A KeyStore can only do so much against it: if your APK can be downloaded, it can be reverse-engineered revealing the exact steps how the store is accessed, reproducing the steps needed to hack into the underlying protected data/functionality.

The keystore can be forgetful…

You’ve just moved in to a new house and have been given the master key for the front door. You only have one of these so you know you need to keep it safe. Your really paranoid so you hire an armed guard, whose sole job is to protect this key, in fact, this is all he has been trained to do and has a catchy slogan of “need to protect a key, its what I was born to do!”. You install an extra lock on your front door as you feel the bodyguard isn’t enough, this is a rough area anyway and who’s going to make sure no-ones about to break in and steal all your crap. You return to your key guard only to be informed he has thrown the key away. You shout and scream at him but he just blankly says “I don’t have it anymore, I didn’t think it was important”. You can’t contain your anger “What the hell, your a jerk! You had one thing to do and you failed, this causes me a lot of problems, why didn’t you tell me you might do this?! What do I do now?!”

[WayBack] Android Security: The Forgetful Keystore – SystemDotRun – Dorian Cussen’s Super Blog

–jeroen

Posted in Android, Development, Java, Java Platform, Mobile Development, Power User, Security, Software Development | Leave a Comment »

Brew reminder to self

Posted by jpluimers on 2020/08/05

From the update process:

==> Caveats
==> hub
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==> python
Python has been installed as
  /usr/local/bin/python3

Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
  /usr/local/opt/python/libexec/bin

If you need Homebrew's Python 2.7 run
  brew install python@2

You can install Python packages with
  pip3 install 
They will install into the site-package directory
  /usr/local/lib/python3.7/site-packages

See: https://docs.brew.sh/Homebrew-and-Python
==> youtube-dl
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==> mpv
zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==> node
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

–jeroen

Posted in Apple, Development, Home brew / homebrew, Power User, Python, Scripting, Software Development | Leave a Comment »

Delphi: Download multiple files in multiple parts at the same time, support resuming, gzip-encoded files, cookies, logging to websites using POST and so on

Posted by jpluimers on 2020/08/05

If I ever need to download multiple files in multiple parts at the same time, support resuming, gzip-encoded files, cookies, logging to websites using POST and so on, then I need to look at [WayBack] http – Delphi- downloading files from the web with sockets – Stack Overflow.

–jeroen

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

Delphi What’s new history and a docwiki URL trick

Posted by jpluimers on 2020/08/05

One of the great things about the Delphi docwiki structure is that the naming system is very consistent.

The consistency helps you quickly finding the What’s new for any version, just by getting the latest first.

Getting the latest one is based based on a docwiki redirection trick that always redirects from an “unversioned” URL to the latest one.

So these two “unversioned” URLs always get you there:

When writing this, the above links got me the below list. For consistency (as you cannot save URLs for prior versions in the WayBack machine because a brain-dead robots.txt setting which archive.is luckily ignores):

By now, there will hopefully be a few more Delphi versions released.

Reminder to self: update the list (:

–jeroen

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

WinBox on MacOS crashing

Posted by jpluimers on 2020/08/04

On my investigation list as WinBox 3.17 only crashes some of the times.

It might have to do with changes in High Sierra:

The real problem: if this happens, WinBox will not start until I have rebooted.

–jeroen

Read the rest of this entry »

Posted in Development, Software Development | Leave a Comment »

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