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

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GitHub – NickRing/Delphi-Shortcut-Finder: Shows/find keyboard short-cuts have be assigned, that may be conflicting.

Posted by jpluimers on 2020/05/20

Reminder to self to eventually try to merge this into GExperts: [WayBack] GitHub – NickRing/Delphi-Shortcut-Finder: Shows/find keyboard short-cuts have be assigned, that may be conflicting.

And a reminder to ensure if I ever bump into XE7 again, I need to ensure it is at least update 1: Source: QualityCentral Report # 127616: registry key has incorrect value, 20 should be 21.

–jeroen

via: [WayBack] I need some help from anyone who knows RTTI better than me. I’m writing an OTA tool to list all the actions or keybindings that are associated with a s… – David Hoyle – Google+

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

DC12V COB LED Light Strip Panel 5W 10W 20W 50W 200W 300W LED Bulb White Blue Red Flip Chip COB Lamp DIY House Car Lighting 12V-in LED Bulbs & Tubes from Lights & Lighting on Aliexpress.com | Alibaba Group

Posted by jpluimers on 2020/05/19

Interesting for some projects: [WayBack] DC12V COB LED Light Strip Panel 5W 10W 20W 50W 200W 300W LED Bulb White Blue Red Flip Chip COB Lamp DIY House Car Lighting 12V-in LED Bulbs & Tubes from Lights & Lighting on Aliexpress.com | Alibaba Group

Note they are not current limited!

This means I need to read more on current limiting; these might be a start:

Via The biggest LED COB panel yet! Voltage/current tests. – YouTube

–jeroen

Read the rest of this entry »

Posted in Development, DIY, Hardware Development, Power User | Leave a Comment »

delphi – always pass SEM_FAILCRITICALERRORS to SafeLoadLibrary

Posted by jpluimers on 2020/05/19

The below is based on [WayBack] delphi – Is there any way to catch the error if loading a dll cannot find a dependency? – Stack Overflow which I got via:

The problem is that the [WayBack] SysUtils.SafeLoadLibrary Function (present since at least Delphi 2007, and a wrapper around the [WayBack] LoadLibrary function (Windows)) does many good things – maybe even too many – so you need to take all of them into account:

function SafeLoadLibrary(const FileName: string; ErrorMode: UINT = SEM_NOOPENFILEERRORBOX): HMODULE;
  1. SafeLoadLibrary loads a Windows DLL or Linux shared object file, as specified by Filename.
  2. SafeLoadLibrary preserves the current FPU control word, preventing library initialization code from permanently overwriting precision and exception masks.
  3. Note:
    • On Windows, SafeLoadLibrary temporarily sets the system error mode to ErrorMode. The default, SEM_NOOPENFILEERRORBOX, suppresses error dialogs. The previous error mode is restored before SafeLoadLibrary exits. For a list of error modes, refer to [Wayback1/Wayback2] SetErrorMode in the Microsoft documentation.
    • Note: On Linux, the Dummy argument is ignored.

Most important tips

Do not ever pass 0 (the number zero) as ErrorMode; I’ve seen lots of applications just passing zero for parameters they are not sure about, but in this case it is the worst solution as it will show all errors as a popup.

Do not forget a parameter either: the default value SEM_NOOPENFILEERRORBOX will only suppress a message box when it fails to find a file. But it will fail to enable SEM_FAILCRITICALERRORS which is what you really want.

Loading DLLs from resources

LoadLibrary and SafeLoadLibrary load the DLL from a file. But what if you want to load it from a resource?

Then this post from Thomas Mueller applies: he adopted the SafeLoadLibrary logic to load from a resource:

Other thoughts to keep in mind

The way Delphi sets the FPU control word is not thread safe: QualityCentral Report # 106943: Set8087CW/SetMXCSR are not thread-safe (you could work around in your implementation by using thread safe versions like mentioned in [WayBack] FastMM / Discussion / Open Discussion:Call to GetStackTrace changes 8087CW).

Calling SetErrorMode sets a global application wide setting (by default including all threads) of error code, so it is better to either:

  • decide for your whole application up front which error mode to use, save it and use the same value everywhere:

Because the error mode is set for the entire process, you must ensure that multi-threaded applications do not set different error-mode flags. Doing so can lead to inconsistent error handling.

Second, SEM_FAILCRITICALERRORS prevents an error to pop up when dependencies of the loaded file are not available. You might want to combine (bitwise or) it with other values like SEM_NOGPFAULTERRORBOX.

ErrorMode values

There are many more modes you can pass to the [WayBack] SetErrorMode function (Windows):

  • Value Meaning
    0
    		 Use the system default, which is to display all error dialog boxes.
     

    SEM_FAILCRITICALERRORS
    0x0001
    		 The system does not display the critical-error-handler message box. Instead, the system sends the error to the calling process.

    Best practice is that all applications call the process-wide SetErrorMode function with a parameter of SEM_FAILCRITICALERRORS at startup. This is to prevent error mode dialogs from hanging the application.
     

    SEM_NOALIGNMENTFAULTEXCEPT
    0x0004
    		 The system automatically fixes memory alignment faults and makes them invisible to the application. It does this for the calling process and any descendant processes. This feature is only supported by certain processor architectures. For more information, see the Remarks section.

    After this value is set for a process, subsequent attempts to clear the value are ignored.
     

    SEM_NOGPFAULTERRORBOX
    0x0002
    		 The system does not display the Windows Error Reporting dialog.
     

    SEM_NOOPENFILEERRORBOX
    0x8000
    		 The OpenFile function does not display a message box when it fails to find a file. Instead, the error is returned to the caller. This error mode overrides the OF_PROMPT flag.

–jeroen

all via:

Related:

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

hexagonal architecture – Google Search

Posted by jpluimers on 2020/05/18

On my research list: read more about hexagonal architecture – Google Search.

Like:

Related: [WayBack] Learned today: In the praxis most domains are way more than sufficiently complex… – Jeroen Wiert Pluimers – Google+

I think I like a round diagrams better than hexagonal ones, because it gives more clarity to me.

Also on my list:

–jeroen

Posted in Development, Software Development, Systems Architecture | Leave a Comment »

On my list of things to try: GitHub – arthepsy/ssh-audit; SSH server auditing

Posted by jpluimers on 2020/05/18

This looks like an ssh equivalent to testssl.sh: [WayBack] GitHub – arthepsy/ssh-audit: SSH server auditing (banner, key exchange, encryption, mac, compression, compatibility, security, etc).

It is on my list of things to try, so I’ve put a watch on the repository changes.

–jeroen

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Posted in Communications Development, Development, Encryption, Internet protocol suite, Power User, Security, SSH, TCP | Leave a Comment »

html frames and iframes from other sites that won’t load: some links

Posted by jpluimers on 2020/05/14

Back in the days, framing stuff from other sites would just work. Nowadays, often they don’t because of a variety of reasons, often the site not wanting to be embedded, which is OK with me.

But it pays knowing what they do and how they do it, to ensure it is not an accidental setting of the address bar URL to the wrong value like in

  if(top != window) {
    top.location = window.location
  }

So here are some links for me to dig deeper when I encounter framing issues again:

My basic idea for a workaround is to go through a proxy.

It looks like others had this idea too, so some links future reading via cors proxy – Google Search:

–jeroen

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Posted in Development, JavaScript/ECMAScript, JSFiddle, Scripting, Software Development, Web Development | Leave a Comment »

Delphi 2007 – move from signature in interface to signature in implementation section

Posted by jpluimers on 2020/05/14

I always thought this was the Ctrl+Shift+Up / Ctrl+Shift+Down in ModelMaker Code Explorer, but it is not: the CnPack navigation is the one that comes most close:

[WayBack] Is there a way in the editor to move from the interface section declaration of a method to its implementation (signature)?… – Bill Meyer – Google+

–jeroen

Posted in Delphi, Development, Software Development | 4 Comments »

appletv – How can I show a read-only version of Google Calendar on Apple TV 4th generation? – Ask Different

Posted by jpluimers on 2020/05/14

Two calendars and three weather frames.Based on [WayBack] appletv – How can I show a read-only version of Google Calendar on Apple TV 4th generation? – Ask Different there is one choice that might work on Apple TV 3rd generation and 4th generation:

This is the only practical solution I dissected from [WayBack] How to surf the web and use Safari on Apple TV – Macworld UK: Here is how to browse the internet and watch web services on your Apple TV.

Installing requires a few steps as described at

Limiting to only Apple TV 4, another solution is also possible:

However the last solution is not a real web browser, so it does not allow a layout I’m using for the calendar, or actually two calendars:

  • weekly calendar on the left so my brother sees his detailed activities for the upcoming days
  • monthly calendar on the top right for an overview of the past and upcoming weeks
  • three weather frames on the bottom right with two weather radars from different sources and a weather overview for the upcoming days

The reason I need this is because my brother is mentally retarded having problems with abstract concepts like relative time and scheduling. Like me he is also easily distracted and not good at repeating tasks. So looking at a schedule at least once a day is tough for him.

He is very good at concrete topics, especially ones he can put to practice right away like “will it rain on my way to work”. That makes him look at this web page in the first place.

Currently this calendar is shown on a monitor by a Raspberry Pi attached to it.

But I might go for the Apple TV 3 route later on.

–jeroen

Posted in Apple, Apple TV, Development, iOS, iOS Development, Mobile Development, Power User | Leave a Comment »

108 byte CSS Layout Debugger · GitHub

Posted by jpluimers on 2020/05/13

A cool [WayBack] 108 byte CSS Layout Debugger · GitHub (and sligtly different versions) that makes your page look like this:

[].forEach.call($$("*"),function(a){a.style.outline="1px solid #"+(~~(Math.random()*(1<<24))).toString(16)})

 

–jeroen

Posted in CSS, Development, JavaScript/ECMAScript, Scripting, Software Development, Web Development | Leave a Comment »

Men’s Java is not JavaScript Annoyed Programmer/Developer T-Shirt

Posted by jpluimers on 2020/05/13

Though the shirt is not available on Amazon [WayBack] any more, still – after 25 years – so many recruiters still get it wrong.

Not just recruiters, so: [WayBack] Why is JavaScript called JavaScript, since it has nothing to do with Java? – Stack Overflow, thanks to CMS [WayBack]:

From an interview made to its creator Brendan Eich:

InfoWorld: As I understand it, JavaScript started out as Mocha, then became LiveScript and then became JavaScript when Netscape and Sun got together. But it actually has nothing to do with Java or not much to do with it, correct?

Eich: That’s right. It was all within six months from May till December (1995) that it was Mocha and then LiveScript. And then in early December, Netscape and Sun did a license agreement and it became JavaScript. And the idea was to make it a complementary scripting language to go with Java, with the compiled language.

he continues on the relation of ECMAScript based languages:

JavaScript, was originally named Mocha, later it was renamed to LiveScript, and then to JavaScript.

The LiveScript to JavaScript name change came because Netscape and Sun did a license agreement.

The language was then submitted for standarization to the ECMA International Organization. By that time, Netscape didn’t allow the use of the “JavaScript” name, so the standarized language is named ECMAScript.

JavaScript isn’t actually an open name. Now it’s a trademark of Sun (now Oracle).

There still a lot of confusion, some people still think that JavaScript, JScript, and ECMAScript are three different languages.

ECMAScript is the “standards” name for the language.

JavaScript is technically a “dialect” of ECMAScript, the Mozilla Foundation can use “JavaScript” as the name of their implementations (currently present on the Rhino and SpiderMonkey engines).

In the early days, Microsoft decided also to do what Netscape was doing on their own browser, and they developed JScript, which is also an ECMAScript dialect, but was named in this way to avoid trademark issues.

–jeroen

via: [WayBack] Does it bug you when people say Java when they actually mean JavaScript? https://www.amazon.com/dp/B06Y3XK69B – Jeroen Wiert Pluimers – Google+

 

Posted in Development, History, Java, Java Platform, JavaScript/ECMAScript, Scripting, Software Development | Leave a Comment »

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