The Wiert Corner – irregular stream of stuff

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

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Archive for the ‘Development’ Category

Mixed JScript/batch file hybrid to create Windows shortcuts

Posted by jpluimers on 2021/03/25

I bumped into this amazing JScript/batch file hybrid. It starts as a batch file, then continues as a JScript script, and creates/updates .lnk files: [WayBack] batch.scripts/shortcutJS.bat at master · npocmaka/batch.scripts · GitHub.

Wow. Just wow.

Not that I would want to be the one maintaining it (:

Via [WayBack] batch file – How do I create a shortcut via command-line in Windows? – Stack Overflow of which I like these answers most:

  • Check the shortcutJS.bat – it is a jscript/bat hybrid and should be used with .bat extension:

    call shortcutJS.bat -linkfile "%~n0.lnk" -target  "%~f0" -linkarguments "some arguments"
    

    With -help you can check the other options (you can set icon , admin permissions and etc.)

  • Nirsoft’s NirCMD can create shortcuts from a command line, too. (Along with a pile of other functions.) Free and available here:

    http://www.nirsoft.net/utils/nircmd.html

    Full instructions here: http://www.nirsoft.net/utils/nircmd2.html#using (Scroll down to the “shortcut” section.)

    Yes, using nircmd does mean you are using another 3rd-party .exe, but it can do some functions not in (most of) the above solutions (e.g., pick a icon # in a dll with multiple icons, assign a hot-key, and set the shortcut target to be minimized or maximized).

    Though it appears that the shortcutjs.bat solution above can do most of that, too, but you’ll need to dig more to find how to properly assign those settings. Nircmd is probably simpler.

–jeroen

Posted in Batch-Files, Development, Scripting, Software Development | Leave a Comment »

Thread by @mathdroid: “I now have the most swagger @github profile, EVER Sorry, your browser doesn’t support embedded videos @github Method: Download and install G […]”

Posted by jpluimers on 2021/03/24

That was such a cool idea: rickrolling your own git profile. [WayBack] Thread by @mathdroid: “I now have the most swagger @github profile, EVER […]”.

Github profile (which in the mean time changed): [WayBack] mathdroid (Odi) · GitHub.

–jeroen

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

When your Delphi IDE suddenly skips unsaved changes during compilation(TL;DR: watch early signs your IDE is hosed, then restart without saving)

Posted by jpluimers on 2021/03/24

A while ago, I observed that when compiling, my Delphi IDE would not take into account unsaved changes any more.

This ws in a time when I was tracking down some hard to reproduce problems of code that sometimes would and sometimes would not compile at all.

The solution was this:

[HKEY_CURRENT_USER\Software\Embarcadero\BDS\18.0\Compiling]
"BackgroundCompilation"="False"

Somehow, the Delphi IDE had turned this flag to True without me telling it did, nor me changing an option (heck if you do a “Delphi” “BackgroundCompilation” – Google Search you hardly get any meaningful results).

Luckily, I did remember what happened around the bahaviour change: the compiler had encountered a strange error, and the IDE had become unstable.

With an unstable IDE, I did have seen damage in saved source files in the past, so I always use version control with Delphi as that allows easier to spot file differences.

What I did not anticipate was that it could corrupting my persisted IDE settings, though every now and then.

Detecting early signs of the IDE becoming unstable

  • any internal compiler error (AV or not)
  • refactoring not succeeding while it should
  • insert mode suddenly becomes override or vice versa
  • editor block selection is suddenly turned on
  • any access violation or pointer error exception

Sometimes (but not always) these can be early signs too

  • debugger blue dots not matching compiled code lines
  • the debugger not being able to debug code despite blue dots being there
  • properties in the object inspector having changed without manual action

Be prepared for an unstable IDE

  • Save your work often
  • At the earliest sign of an unstable IDE: kill (do not save work!) the affected bds.32 process using Process Explorer

BackgroundCompilation

A “Delphi” “BackgroundCompilation” – Google Search did not get much relevant results. Below are the most relevant ones I could find from it:

Too bad Google does not index the WayBack machine, as I think it contains relevant material that is now hard to find.

So it looks like the feature was introduced somewhere close to Delphi 5:

[HKEY_CURRENT_USER\Software\Borland\Delphi\5.0\Compiling]
"Show Compiler Progress"="True"
"Warn on Package Rebuild"="-1"
"Compile Beep"="0"
"Cache Headers"="0"
"BackgroundCompilation"="0"

“Delphi” “Background Compilation” – Google Search shows much more information, based on what it returned I found that the first actual documentation was for Background Compilation in Delphi 2010, some 10 years after it became available:

The image in the blog post of former product manager Andreano Lanusse shows why I did not see the behaviour: when background compiling is active, the progress dialog is transparent (and non-modal). I did not have the compiler progress enabled, so never saw that dialog change behaviour.

–jeroen

 

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

Build your own Infrared reader head for electriciti smart meters for around USD 6: haus-automatisierung.com [4K] – YouTube

Posted by jpluimers on 2021/03/24

In German, but very interesting IR-Lesekopf für SmartMeter selber bauen | haus-automatisierung.com [4K] – YouTube:

I could not find the promised follow-up video at haus-automatisierung.com – YouTube, but the manual steps and the site below have enough information for me.

Too bad the site is way to big to fully archive in the WayBack machine. I only saved the top pages:

Related: [WayBack] MQTT-Grundlagen-Kurs – haus-automatisierung.com

–jeroen

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Posted in Development, Hardware Development, Hardware Interfacing, IoT Internet of Things, Raspberry Pi, Software Development | Leave a Comment »

Still unsolved since 2015 NetBeans: Bug 251538 – Your Installer is Creating Invalid Data for the NoModify DWORD Key which crashes enumeration of the Uninstall Key in at least PowerShell

Posted by jpluimers on 2021/03/23

Lovely. Having a bug reported to you in 2015, and acknowledged, that makes software crash and not fixing it.

 

For NetBeans (still one of the major IDEs) and related stuff like GlassFish, this is too true (a workaround is in the Solution steps) below: [WayBack] Bug 251538 – Your Installer is Creating Invalid Data for the NoModify DWORD Key which crashes enumeration of the Uninstall Key in at least PowerShell, and copied to [WayBack] [NETBEANS-2523] Netbeans 64-bit creates invalid nomodify value in windows registry for years – ASF JIRA.

This one appears for instance when running choco install --yes jre8 (but is certainly not limited to it) as it inspects uninstall registry values which have been corrupted and resulted into [WayBack] “Specified cast is not valid” on jre8 upgrade · Issue #18 · proudcanadianeh/ChocoPackages · GitHub.

Anyway: back to the NoModify issue:

phansson 2015-06-23 13:35:00 UTC
Yep, I can see this problem as well. I believe the problem (bug) has indeed always existed.

What happens is that someone (in this case NetBeans Installer) has put an 8-byte value into a Registry field that should only contain a 4-byte value. DWORDs are 4-byte.

If you use Registry Editor you can clearly see the problem if you look at something NBI has installed. You must look under either
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall (64-bit installers) or HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall (32-bit installers). For some reason I don't see the problem for those NBI applications installed with a 32-bit installer, meaning the stuff in HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall. This can probably be explained when you read the next bit.

NBI actually sets a number of Registry key values but all of them are strings, with the exception of NoModify value. As far as I know this value already defaults to true (=1) if not present so the fact that Windows cannot interpret what NBI has put into the Registry does not have much effect .... until all other kinds of tools will start to explain as you've encountered.

So, what's the problem?  As far as I can see this is really just a very simple bug. In the NBI project (NetBeans Platform source) you have a file called jni_WindowsRegistry.c which defines various JNI methods that can then be used from within Java. One of these is called 'set32BitValue0(....)'.

It looks like this:

JNIEXPORT void JNICALL Java_org_netbeans_installer_utils_system_windows_WindowsRegistry_set32BitValue0(JNIEnv *jEnv, jobject jObject, jint jMode, jint jSection, jstring jKey, jstring jName, jint jValue) {
    unsigned short*  key       = getWideChars(jEnv, jKey);
    unsigned short*  name      = getWideChars(jEnv, jName);
    DWORD  dword     = (DWORD) jValue;
    LPBYTE byteValue = (LPBYTE) &dword;
    
    if (!setValue(getMode(jMode),getHKEY(jSection), key, name, REG_DWORD, byteValue, sizeof(name), 0)) {
        throwException(jEnv, "Cannot set value");
    }
    
    FREE(key);
    FREE(name);
}

One of the parameters passed to the setValue() function is the size (bytes) of the value. Unfortunately whoever made this has made a blunder by using 'sizeof(name)' for that parameter. It should have been the size of the value, not the size of the name, meaning sizeof(dword) or just a hard-coded value of 4.  Just imagine what sizeof(name) will give you if name happens to be 'NoModify'. Yep, that's right: It will be 8.

As I said, I believe this blunder has been in the code from the very beginning. It just hasn't had much effect until now.
Comment 3phansson 2015-06-24 22:12:06 UTC
See https://bitbucket.org/phansson/nbi-native-jnilib-windows
for a fix to this problem. 

Honestly the sole reason why that project exists was that I had to have this problem fixed as our corporate customers were complaining about our software "messing up their Registry" and we could not wait for NetBeans team to fix the problem.
Comment 4oldium 2017-03-03 21:28:13 UTC
Any update on this? I lost 1 hour finding why the Get-ItemProperty of Chocolatey failed and found this. Then I remembered that I had the same issue one year ago...

This issue is now 2 years old, the fix is a one-liner. Is there any plan to fix this or (I am just curious) is Netbeans project dead?
Comment 5scott.fagg 2018-04-27 03:13:04 UTC
We encounter this too. Machines with Netbeans installed on our network often encounter issues when IT roll out software installs. Fix has been to remove and recreate the offending key.

If this has been known since 2015, is there any intention of fixing it ?

I encountered it in 2019, when switching my JRE installations to become chocolatey based.

Solution steps

  1. Run the script mentioned in [WayBack] powershell – How to resolve “ERROR: Specified cast is not valid.” error during installation? – Super User:

    Run the below:

    Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | % { write-host "Key Name:" $_.PSChildName }
    

    This should return some results, then, will return the Specified cast error. The error will occur on the key harboring the invalid subkey.

  2. Then inspect the keys after that in regedit, and watch for any value of type REG_DWORD with a value (invalid DWORD (32-bit) value) (usually named NoModify
  3. Note those keys, and find them in appwiz.cpl
  4. Uninstall the accompanying software

On my systems

Delete the below pieces of crap.

Then run choco install --yes jre8 again.

  • Glassfish

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\nbi-glassfish-mod-3.1.43.0.0

  • NetBeans IDE

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\nbi-nb-base-7.0.0.0.0

Luckily, the NetBeans uninstaller can uninstall GlassFish at the same time:

Do not re-install, as they re-insert the corrupt data.

–jeroen

Posted in Development, Java, Java Platform, Software Development | Leave a Comment »

Delphi object instance lifetime demo; do not use AfterConstruction as a poor-mans way to work around non-virtual constructor or undetermined Create hierarchy calls

Posted by jpluimers on 2021/03/23

I think using AfterConstruction is a poor man’s solution that you should only use in exceptional cases, as it is:

  • called only after the last constructor in the chain is called.
  • called outside of the constructor chain (i.e. exceptions in it will not automatically call the destructor chain, nor BeforeDestruction)
  • meant to add any initialization code that requires a fully created object instance.

There were quite a few customer sites I visited that were using AfterConstruction. Usage roughly falls into two cases:

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Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development, Undocumented Delphi | 1 Comment »

Some links with notes on WoonVeilig/Egardia security system communications, protocols and support by 3rd party home automation apps

Posted by jpluimers on 2021/03/23

Security issues for older models (mainly GATE01 and WV-1716 systems; which used a lot of Climax components):

A more recent security review:

Physical security is important too; ensure the system is in an enclosed closet, powered by a UPS and your communication lines are secured as well: [WayBack] Manipulationen an Alarmanlagen verhindern – Smarthomewiki

Dutch links on the hardware connections and protocols used:

More recent information:

API usage:

More subdomains (in 2019) via:

–jeroen

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Posted in Communications Development, Development, Power User, Security, Software Development | Leave a Comment »

ESP32-CAM Surveillance Camera (Home Assistant Compatible) – YouTube

Posted by jpluimers on 2021/03/18

Cool little camera.

Absolutely not HD, but comes in very handy for instance when monitoring things from a remote location.

More at [WayBack] ESP32-CAM Video Streaming Web Server (works with Home Assistant) | Random Nerd Tutorials

Build an IP Surveillance Camera with the ESP32-CAM board. The ESP32 Camera hosts a video streaming web server that integrates with Home Assistant or in any browser.

–jeroen

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Posted in Development, ESP32, Hardware Development, Hardware Interfacing | Leave a Comment »

Image upscaling: waifu2x tool (open source)

Posted by jpluimers on 2021/03/18

Originally created for anime upscaling, the waifu2x algorithm works very well for photos, logos and text.

It is open source too!

More information:

 

–jeroen

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

delphi – Invalid floating point operation calling Trunc() – Stack Overflow

Posted by jpluimers on 2021/03/18

I bumped into [WayBack] delphi – Invalid floating point operation calling Trunc() – Stack Overflow, while searching for what might have tests like these fail:

TValueRecordTests.Int64_Through_Value_Container_via_Currency_Intermediate_Is_Identity_Operation(9223372036854775807) = 9223372036854775807
EInvalidOp with message 'Invalid floating point operation'

In the end, it reproduced with a much more simple test case class of which the first three fail (EInvalidOp with message 'Invalid floating point operation'), but the last three succeed.

Lesson learned:

  • High(Int64) stored in Currency or Double, will not Trunc back to their original value.
  • Low(Int64) stored in Currency will not Trunc back to their original value.
  • Testing boundary conditions is nice, but be sure what your boundary conditions are in the first place.

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