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

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Archive for August 13th, 2020

PowerShell: checking minimum version

Posted by jpluimers on 2020/08/13

Nowadays, often your PowerShell code uses features unavailable in older PowerShell versions. When running it on a version that is too old, you usually get an error message, for instance like this:

Unable to find type [Ordered]: make sure that the assembly containing this type is loaded.

Back in the days, this was a new feature introduced in PowerShell 3.0: [WayBack] Use cases of [ordered], the new PowerShell 3.0 feature – Stack Overflow

It is way friendlier to show a message indicating the version is too old in stead of throwing this error.

That’s where the # Requires Version 3.0 directive comes in: [WayBackabout_Requires | Microsoft Docs.

Adding this line to the top of a script gives output like this on a stock Windows 7 SP1 system that has PowerShell 2.0:

# PowerShell -f List-Delphi-Installed-Packages.ps1
The script ‘List-Delphi-Installed-Packages.ps1’ cannot be run because it contained a “#requires” statement at line 1 for Windows PowerShell version 3.0. The version required by the script does not match the currently running version of Windows PowerShell version 2.0.
+ CategoryInfo : ResourceUnavailable: (List-Delphi-Installed-Packages.ps1:String) [], ParentContainsErrorRecordException
+ FullyQualifiedErrorId : ScriptRequiresUnmatchedPSVersion

Note that PowerShell 3.0 is also the minimum version for debugging it in Visual Studio Code (which means you do not have to use PowerShell ISE any more; it is still there , but so far behind as a development tool that many prefer Visual Studio Code):


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

PowerShell: finding WSD printer details enumerating through HKLM\SYSTEM\CurrentControlSet\Enum\SWD\DAFWSDProvider

Posted by jpluimers on 2020/08/13

WSD seems the way Microsoft Windows 8+ does printing, which makes it a lot harder to find the IP address of a printer, for instance to configure a Mac to print to it.

The key seems to be enumerating over HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\SWD\DAFWSDProvider.

Some links that should help me doing this:


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

A load on agility related posts referenced by Markus Eggers – Google+

Posted by jpluimers on 2020/08/13

A while ago, Markus Eggers – Google+ started following me on G+, so I found out about his posts: most of them refer to very useful agility related ones.

So my reading list just got a bit longer, with tuples on Markus Eggers – Google+ and where it points to.

Other interesting posts:


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

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