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 ‘Software Development’ Category

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Need to play with this: Raspberry Pi web simulator from Microsoft Corporation

Posted by jpluimers on 2018/12/26

It’s been a while since [WayBack] +Microsoft Corporation has recently released a preview version of an open source +Raspberry Pi web simulator where you can connect sensors and component… – Jean-Luc Aufranc – Google+

Back then it was convoluted to get going. Hopefully by now that has changed.

So time to take another look during the holiday season:

 

It reminded me a lot of [WayBack] Bring ideas to life with free online Arduino simulator and PCB apps | Autodesk Circuits (a.k.a. circuits.io):

Read the rest of this entry »

Posted in *nix, Development, Hardware, Hardware Development, Hardware Interfacing, Linux, Power User, Raspberry Pi, Software Development | Leave a Comment »

eventviewer – View Shutdown Event Tracker logs under Windows Server 2008 R2 – Server Fault

Posted by jpluimers on 2018/12/25

Works on translated systems:

PowerShell
Get-EventLog System | Where-Object {$_.EventID -eq "1074" -or $_.EventID -eq "6008" -or $_.EventID -eq "1076"} | ft Machinename, TimeWritten, UserName, EventID, Message -AutoSize -Wrap

Or on one line:

Get-EventLog System ^| Where-Object {$_.EventID -eq "1074" -or $_.EventID -eq "6008" -or $_.EventID -eq "1076"} ^| ft Machinename, TimeWritten, UserName, EventID, Message -AutoSize -Wrap

I’ve adapted the custom view to include all these event IDs above:

  • 12: The operating system started at system time ‎<iso8601utc>.
  • 13: The operating system is shutting down at system time  <iso8601utc>.
  • 109: The kernel power manager has initiated a shutdown transition.
  • 1074: [WayBack] The process <process> has initiated the restart of <computer name> for the following reason: No title for this reason could be found.
    Minor Reason: <reason>
    Shutdown Type: <type>
  • 1076: [WayBack] The reason supplied by user <user name> for the last unexpected shutdown of this computer is: <error description>
    Reason Code: <error code>
    Bug ID: <bug id>
    Bugcheck String: <string>
    Comment: <comment>
  • 6008: [WayBack] The previous system shutdown at <time> on <date> was unexpected.

Steps for the custom view:

Open Event Viewer then

  • Right click Custom Views
  • Click Create Custom View
  • Under the Filter tab
    • Keep Logged as Any time
    • Select all the Event level types (Critical, Warning, etc.)
    • Choose by source = Windows Logs > System
    • For Event ID under the Includes/Excludes Event IDs section enter 12,13,1074,1076,6008 for the Event ID
  • Click Ok
  • Enter a name like Shutdown Events and any description then
  • Click Ok again to complete the custom event log.

Your new custom view should show up in the list of custom views with the correct filter applied.

Source: [WayBack] eventviewer – View Shutdown Event Tracker logs under Windows Server 2008 R2 – Server Fault

–jeroen

Posted in CommandLine, Development, Power User, PowerShell, PowerShell, Scripting, Software Development, Windows | Leave a Comment »

Do not put IFDEF with relative paths in your .dpr as the Delphi IDE cannot match them in the .dproj

Posted by jpluimers on 2018/12/20

The Delphi IDE manages the .dpr and .dproj files for, trying to keep them in sync.

Some information is duplicated between the two, especially files referenced by relative paths: those files are contained in your project.

This means you cannot do something like this in your .dpr file:

  {$IFDEF DEBUG}
  Debug in '..\..\..\..\Shared\Debug.pas';
  {$ELSE}
  Debug in '..\Debug.pas'
  {$ENDIF}

There is no equivalent for this in the .dproj and it will confuse the IDE which file now actually is or is not inside your project.

Better to leave the file outside of your project, then modify the RELEASE/DEBUG search paths to have the correct one.

Even better is to have just one Debug.pas file containing the changes.

–jeroen

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

About Blocks – bl.ocks.org

Posted by jpluimers on 2018/12/20

[WayBack] About Blocks – bl.ocks.org is so cool:

Bl.ocks (pronounced “Blocks”) is a simple viewer for sharing code examples hosted on GitHub Gist.

…

The main source for your example is in index.html. This file can contain relative links to other files in your Gist, such as images, scripts or stylesheets. And of course you can use absolute links, such as CDN-hosted D3, jQuery or Leaflet. To explain your example, add a README.md written in Markdown. (You can omit the index.html if you just want to write, too.)

[WayBack] Code-only-Blocks are cool too:

When your Gist is missing an index.html file, will hide the example iframe but continue to display everything else.

Just compare these:

–jeroen

Posted in Development, DVCS - Distributed Version Control, gist, GitHub, jQuery, Scripting, Software Development, Source Code Management, Web Development | Leave a Comment »

Spring4D How to correctly assign NULL to a Nullable type?

Posted by jpluimers on 2018/12/19

Since I tend to forget this: [WayBack] Spring4D How to correctly assign NULL to a Nullable type? this is correct? fDateTime = Null; or this? fDateTime := nil; – Jacek Laskowski – Google+

The preferred way is fDateTime := nil.

This is possible because of [WayBack] Delphi sorcery: How to create an operator overload that only accepts nil using a reference type (in this case interface) so no non-nil pointers can be passed:

type
  Nullable<T> = record
  strict private type
    Null = interface end;
  public
    class operator Implicit(const value: Null): Nullable<T>;
  end;

–jeroen

Posted in Delphi, Development, Software Development, Spring4D | 2 Comments »

“I tyically ask recruiters to point out which of these are pokemon” – via “my linkedin profile : ProgrammerHumor”

Posted by jpluimers on 2018/12/19

[Archive.is] Vincent D. Warmerdam (also known as koaning; D is for Damian) put Start-up or Pokémon? Big-data or Pokémon? into practice a while back:

my linkedin profile: “I tyically ask recruiters to point out which of these are pokemon”

Source: [WayBack] “my linkedin profile : ProgrammerHumor”

He’s a very interesting person to follow:

I also discovered https://bl.ocks.org because of Vincent. More on that later.

–jeroen

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

Python threading: logging exceptions during the `run`

Posted by jpluimers on 2018/12/19

In A few observations on Python while I made my first steps into it, I mentioned the standard threading idiom in Python by wrapping the thread in a function. This has the drawback of having to catch and handle any exceptions in that function.

The higher level [WayBack] threading module has a [WayBack] Thread class with a [WayBack] run() method does not handle exceptions either.

For investigation of threading issues, it’s very convenient to know about the exceptions in a thread and their context.

So I’ve made a small base class that automagically logs any exceptions during a run:

import threading

from log import Log

class ExceptionLoggingThread(threading.Thread):

    def __init__(self):
        threading.Thread.__init__(self)
        self.logger = Log().getLogger()
        self.logger.debug("ExceptionLoggingThread().")

    def run_logic(self):
        self.logger.debug("Thread started.")

    def run(self):
        try:
            self.run_logic()
        except:
            self.logger.exception('Exception in `run`')
            raise

–jeroen

Posted in Development, Python, Scripting, Software Development | Leave a Comment »

Spring4D Conference

Posted by jpluimers on 2018/12/19

Do not forget the early bird sales ends soon for the Spring4D European Conference 2018 – Bergamo Italy, right before Easter 2019.

Both the original author and the current maintainer will be there, and it will be a great place to socialize with fellow Spring4D users.

Buy tickets: [WayBack] Spring4D Conference

Via:

–jeroen

Posted in Delphi, Development, Software Development, Spring4D | Leave a Comment »

git – I ran into a merge conflict. How can I abort the merge? – Stack Overflow

Posted by jpluimers on 2018/12/18

I need this one day: [WayBack] git – I ran into a merge conflict. How can I abort the merge? – Stack Overflow

–jeroen

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

Links to help me monitor my Zeverlution PV converter locally

Posted by jpluimers on 2018/12/18

Since it’s my data, I’d rather be in control myself, so here are some links that will help me going around the Zevercloud solution I posted about yesterday.

Some other interesting links of software supporting Zeversolar devices:

Note that PVoutput.org does have native ZeverCloud updating using the ZeverSolar API key:

But these might help me:

–jeroen

Read the rest of this entry »

Posted in Development, Hardware Interfacing, LifeHacker, Power User, Software Development, Solar Power, Zeverlution, Zeversolar | Leave a Comment »

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