Pass complex arguments to powershell script through encoded command - powershell

Question

I want to run nested powershell script block, with complex type arguments. I want to pass parameters to powershell scriptblock trough encoded command and encoded arguments.
I`m trying this script.
$text = "This is a test message."
$Cred = get-credential 'alex'
$Arguments = #{
Msg = $Text
Proc = $PID
Cred = $Cred
}
$Serialized = [System.Management.Automation.PSSerializer]::Serialize($Arguments)
$Bytes = [System.Text.Encoding]::Unicode.GetBytes($Serialized)
$EncodedArguments = [Convert]::ToBase64String($Bytes)
$ScriptBlock = {
param([String]$Base64)
$Serialized = [System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String($Base64))
$Arguments = [System.Management.Automation.PSSerializer]::Deserialize($Serialized)
Write-Host " $($Arguments.msg) FROM PID: $($Arguments.proc), cred: $( $Arguments.Cred.Username)"
}
$Bytes = [System.Text.Encoding]::Unicode.GetBytes( $ScriptBlock.ToString() )
$EncodedCommand = [Convert]::ToBase64String( $Bytes )
Start-Process -FilePath powershell -ArgumentList '-noprofile', '-noexit', `
'-EncodedCommand', $EncodedCommand, '-EncodedArguments', $EncodedArguments
Powershell process flashing, then closing.
Help me to correct this script.
PS. Why stack overflow editor replace the header of my message 'Hello team!' ? Its all right on preview.

Answer 1

A -EncodedArguments parameter (or something alike) doesn't exist, therefore I would simply embed your arguments as a default param value in your (encoded) scriptblock:
$Arguments = #{
Msg = "This is a test message."
Proc = $PID
Cred = (Get-Credential 'Alex')
}
$Serialized = [System.Management.Automation.PSSerializer]::Serialize($Arguments)
$Bytes = [System.Text.Encoding]::Unicode.GetBytes($Serialized)
$EncodedArguments = [Convert]::ToBase64String($Bytes)
$ScriptBlock = "param([String]`$EncodedArguments = '$EncodedArguments')" + {
$Serialized = [System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String($EncodedArguments))
$Arguments = [System.Management.Automation.PSSerializer]::Deserialize($Serialized)
Write-Host " $($Arguments.msg) FROM PID: $($Arguments.proc), cred: $( $Arguments.Cred.Username)"
}
$Bytes = [System.Text.Encoding]::Unicode.GetBytes( $ScriptBlock.ToString() )
$EncodedCommand = [Convert]::ToBase64String( $Bytes )
Start-Process -FilePath powershell -ArgumentList '-noprofile', '-noexit', '-EncodedCommand', $EncodedCommand