Converting String to PsCustomObject
The problem I am running into is passing PsCustomObject
as an argument to the cmdlet Start-Process
(I am essentially starting a new PowerShell process to run the script asynchronously from the calling script). The thing is, although the parameter is defined as a type PsCustomObject
, it is accepted as a string for some reason, so it seems to me that I need to convert it back to in PsCustomObject
order to access any attributes.
Here is the required part of my script call:
# Convert JSON object to PS object
$payload = ConvertFrom-Json $body
Write-Host $payload
## Returns exactly the following PsCustomObject:
## @{os=Windows Server Datacenter 2016; vmName=sbtestvm; diskType=Managed; username=testuser;
## password=Pa55w.rd1234; location=West Europe; size=Standard_D1;
## requestType=0; sender=test}
Write-Host $payload.os
## Returns: Windows Server Datacenter 2016
# Fire up new worker shell Asynchronously
Start-Process powershell.exe -ArgumentList '-NoExit', "$PSScriptRoot\ServiceBus-AsyncWorker.ps1", "'$payload'" # -Windowstyle Hidden
And my executed script:
Param(
[Parameter(Mandatory=$True)]
[PSCustomObject]$Request
)
# Import RequestHandler module to deal with processing service bus requests
Import-Module $PSScriptRoot\RequestHandler\RequestHandler.psm1
Write-Host $Request
## Returns exactly the same as 'Write-Host $payload' in the calling script
Write-Host $Request.os
## Returns empty string
Write-Host $Request.GetType()
## Returns System.String <--- This is the issue
In short: is there a way to prevent this object from being automatically parsed as a string in the first place? If not - how can this string be returned to the appropriate object type?
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Start-Process powershell.exe
a new PowerShell process starts. You cannot pass PowerShell objects across process boundaries.
You can change
Start-Process powershell.exe -ArgumentList '-NoExit', "$PSScriptRoot\ServiceBus-AsyncWorker.ps1", "'$payload'"
to
$PSScriptRoot\ServiceBus-AsyncWorker.ps1 $payload
to avoid creating a new process, but it will run the script in the same window.
If you need to run the script separately from the console, you can run it as a background job :
$job = Start-Job -ScriptBlock {
Param($Path, $Data)
& "$Path\ServiceBus-AsyncWorker.ps1" $Data
} -ArgumentList $PSScriptRoot, $payload
Otherwise, you need to pass the argument in serialized form (like the original JSON) when a new process is spawned:
Start-Process powershell.exe -ArgumentList '-NoExit', "$PSScriptRoot\ServiceBus-AsyncWorker.ps1", "`"$body`""
and then (re) create the object from the string:
Param(
[Parameter(Mandatory=$true)]
[string]$Json
)
# Import RequestHandler module to deal with processing service bus requests
Import-Module $PSScriptRoot\RequestHandler\RequestHandler.psm1
$Request = ConvertFrom-Json $Json
...
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