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

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Archive for December 11th, 2019

Exceptional Safety

Posted by jpluimers on 2019/12/11

I think I tend to forget with [WayBack] Exceptional Safety is this:

object destruction process must not cause or raise any unhandled exceptions or you will have memory leaks beyond your ability to fix them.

Particulary, that means the BeforeDestruction method – and destructors themselves – must never ever allow exceptions to escape them. Any escaping exception there will always cause memory leak. Period.

–jeroen

via [WayBack] Single or nested try…finally blocks? None will prevent the memory leak if your destructors are broken. – Dalija Prasnikar – Google+

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

Node-RED

Posted by jpluimers on 2019/12/11

Node-RED is a programming tool for wiring together hardware devices, APIs and online services in new and interesting ways.It provides a browser-based editor that makes it easy to wire together flows using the wide range of nodes in the palette that can be deployed to its runtime in a single-click.

Seems one of the ways to automate our home: [WayBack] Node-RED, as it supports many input and output methods with all kinds of nodes between them:

input output
inject debug
catch
status
link link
mqtt mqtt
http http response
websocket websocket
tcp tcp
udp udp
serial serial

It is based on node.js, seems to need PM2 for running as a service, so I need to first figure out how well it runs on OpenSuSE (with more details than this gist).

After that I need to figure out how to version your configurations using git and document as it looks like the configurations sources are stored in JSON format [WayBack].

For resources:

  • StackOverflow node-red tag
  • Github node-red repositories
  • nodered documentation to:
    • get started (including Installation, Running, Adding non-stock Nodes, Upgrading, Creating your first and second flow, running on Docker / Windows)
      • running on a device (Raspberry Pi, BeagleBone Black, Android) which needs extra device specific modules to hardware inputs/outputs
      • communicating with a device (Arduino)
      • running in the cloud (IBM Bluemix, SenseTecnic FRED, Amazon Web Services, Microsoft Azure)
    • user guide (including Configuration, Security, Logging, Command-line Admin, Writing Functions, Embedding into an existing app)
    • cookbook (with many flows covering Basics, HTTP and MQTT)
    • creating nodes (with a wall of information: Creating your first node, JavaScript File, HTML File, Storing Context, Node properties, Node credentials, Node appearance, Node status, Configuration nodes, Help style guide, Packaging, Internationalisation)
    • flows (hundreds of them)

Code is published as JSON, but I wish more examples also showed the visual representation.

Via: [WayBack] Now I can go to bed :-) Added node-red [1] to my setup and thanks to node-red-contrib-ui [2] (replaced by node-red-dashboard [3]) I can now generate ni… – Jan Wildeboer – Google+ who also provided the large screenshot below.

–jeroen

Read the rest of this entry »

Posted in Development, Hardware Development, IoT Internet of Things, Network-and-equipment, Power User, Raspberry Pi | Leave a Comment »

Delphi/GDIPBitmap at master · tothpaul/Delphi · GitHub

Posted by jpluimers on 2019/12/11

Next time I don’t need something like TPngImage any more:

this little unit let you load any GDI+ supported graphic format (BMP, JPG, PNG or TIF) into a Delphi TBitmapit’s a TBitmap helper, so just add the unit to you’re project and call the method GDIPLoadFromStream

Source: Delphi/GDIPBitmap at master · tothpaul/Delphi · GitHub

Found via: [WayBack] Let’s extend TBitmap with a GDIP loader :) TBitmap.GDIPLoadFromStream can load any GDI+ supported format (JPEG, PNG, TIFF) https://github.com/tothpaul… – Paul TOTH – Google+

–jeroen

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

 
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