Creating GUI - Null Valued Expression?

PowerShell Help
1

I am attempting to make a GUI that our Help Desk can utilize when deploying newly imaged machines. I apologize if this is a stupid question but I’m stumped.

I am using ISE Steroids/Visual Studio to create it and am fairly confident I know what the issue is but I’m not entirely sure how to resolve the problem.

When I run it on my computer it works fine but when I go to run the script or converted EXE on another machine I receive an error…

You cannot call a method on a null-valued expression.
At C:\Users\bb16480\Desktop\UItest.ps1:73 char:1
+ $SEP.add_Click(
+ ~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

I couldn’t get the code to load the $XAML in here so I put it in pastebin at: function Convert-XAMLtoWindow{ param ( [Parameter(Mandatory=$ - Pastebin.com

2

Well, it’s thinking that $SEP doesn’t actually contain anything. I’m not seeing that in your code, though. It seems as if you expect $SEP to be a form object…?

BTW, you can also use Gists here. If you paste the Gist URL into the forums, it’ll retrieve and display your code all pretty-like.

3

Sorry, I believe I was testing something else but that didn’t work and I put in the incorrect error. :frowning:

It’s not $Sep it’s $Windows.SEP

You cannot call a method on a null-valued expression.
At C:\Users\bb16480\Desktop\UItest.ps1:73 char:22
+ $window.SEP.add_Click <<<< (
    + CategoryInfo          : InvalidOperation: (add_Click:String) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

This does run on my Win10 machine with ISE-Steroids but when I try to run this script on our normal Win7 client machines, this is when the error comes up. The GUI does popup but I still receive the error code.

Hopefully that makes sense. I’m trying hard to wrap my head around all this. Also thanks for the tremendous sessions @MMS this year, it was fantastic.

4

I don’t see the rest of the code that creates the form at that link.

5

Hopefully this helps for viewing?

https://gist.github.com/bbalz/8d2761945455b5ccf0b86bcd0405c75a

6

The form works for me on win7.

$window.SEP.add_Click(
{
[System.Object]$sender = $args[0]
[System.Windows.RoutedEventArgs]$e = $args[1]

write-host ‘sep clicked’

}
)

7

Oy… well it turns out it was something with the VM I was testing this on that caused an issue.

Appreciate you checking it out and sorry about that. I was kind of banging my head on the wall the past hour or so in between some other work and it turns out it was fine after all.

Uffta…

8

Did you have any luck with figuring this out?
I am seeing the same issue on a vista machine. I believe its due to something not being up to date, but Im not sure what.