Passing custom object array to a function - powershell

Question

I'm trying to pass an array of custom objects to a function for further processing of these objects.
Here's the function where I create my custom object array:
Function GetNetworkAdapterList
{
# Get a list of available Adapters
$hnet = New-Object -ComObject HNetCfg.HNetShare
$netAdapters = #()
foreach ($i in $hnet.EnumEveryConnection)
{
$netconprop = $hnet.NetConnectionProps($i)
$inetconf = $hnet.INetSharingConfigurationForINetConnection($i)
$netAdapters += New-Object PsObject -Property #{
Index = $index
Guid = $netconprop.Guid
Name = $netconprop.Name
DeviceName = $netconprop.DeviceName
Status = $netconprop.Status
MediaType = $netconprop.MediaType
Characteristics = $netconprop.Characteristics
SharingEnabled = $inetconf.SharingEnabled
SharingConnectionType = $inetconf.SharingConnectionType
InternetFirewallEnabled = $inetconf.InternetFirewallEnabled
SharingConfigurationObject = $inetconf
}
$index++
}
return $netAdapters
}
Then in my main code I call above function like this:
$netAdapterList = GetNetworkAdapterList
The $netAdapterList returns the expected data, and I can do stuff like:
$netAdapterList | fl Name, DeviceName, Guid, SharingEnabled
So far so good.
Now I want to call a function passing in the $netAdapterList
I've created a dummy function like this:
Function ShowAdapters($netAdapterListParam)
{
$netAdapterListParam | fl Name, DeviceName, Guid, SharingEnabled
}
And when I invoke it like this:
ShowAdapters $netAdapterList
Nothing gets printed out.
I've tried changing the function's signature but still no luck:
Function ShowAdapters([Object[]]$netAdapterListParam)
Function ShowAdapters([Object]$netAdapterListParam)
Function ShowAdapters([PSObject[]]$netAdapterListParam)
Function ShowAdapters([array]$netAdapterListParam)
Anybody knows what I'm doing wrong? How can I get to my custom objects inside the function?

Answer 1

Thanks for your reply #Christian. Tried your steps, copy pasting bits and pieces into the shell and it indeed worked. However If i run the full .ps1 script is not printing out anything.
I've run the script in Powershell IDE setting breakpoints inside the ShowAdapters function, and $netAdapterListParam has indeed the expected custom objects array I'm passing in, so I've narrowed down the issue to be in the FL commandlet.
For some reason $netAdapterList | fl Name, DeviceName, Guid, SharingEnabled did not work for me, so I ended up using the following instead:
$formatted = $netAdapterListParam | fl Name, DeviceName, Guid, SharingEnabled | Out-String
Write-Host $formatted
That did the trick and the 4 properties were printed on the screen.
Lessons learned:
1) The Powershell IDE built into Win7 can be a very useful tool for debugging scripts
2) Format-List can be quirky when formatting custom objects, so Out-String was required.