Powershell toolmaking ebook

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1

On the ebook Learn PowerShell Toolmaking in a Month of Lunches
there is a lab in the chapiter 26, with a challenges, Get-Service | Export-TDF c:\services.tdf,
when i try changing the code in the proxy function with
$scriptCmd = { & $wrappedCmd @PSBoundParameters -delimiter "t"}` ,
the result is an error when calling the export-tdf proxy function :

`Exception calling "GetSteppablePipeline" with "1" argument(s): "The expression after '&' in a pipeline element produced an object that was not valid.It must result in a 
command name, a script block, or a CommandInfo object"

have an idea ? thank you

2

harry,
Welcome to the forum. :wave:t4:

Before we proceed … When you post code, sample data, console output or error messages please format it as code using the preformatted text button ( </> ). Simply place your cursor on an empty line, click the button and paste your code.

Thanks in advance

How to format code in PowerShell.org <---- Click :point_up_2:t4: :wink:

Since not all of us have access to that book or have read it already … could you please share at least all the relevant code here completely along with the complete error message (both formatted as code, please)?

Thanks

1 Like
3

Excuse me , i will proceed with the formating as required

4

this is the source code

#proxy function
<#
First, we need to run these lines to create the metadata:
$metadata = New-Object System.Management.Automation.CommandMetaData (Get-Command Export-CSV)
Chapter 26 lab 83
[System.Management.Automation.ProxyCommand]::Create($metadata) | Out-File ProxyExportCSV.ps1
#>
Function Export-TDF {
#we deleted the help link in cmdletbinding and added our own
<#
.Synopsis
Export to tab delimited file
.Description
This is a proxy command to Export-CSV which is hard coded to export
data to a tab-delimited file.
#>
[CmdletBinding(DefaultParameterSetName='Delimiter',SupportsShouldProcess=$true,ConfirmImpact='Medium')]
param(
 [Parameter(Mandatory=$true, ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true)]
 [psobject]
 ${InputObject},
 [Parameter(Position=0)]
 [ValidateNotNullOrEmpty()]
 [string]
 ${Path},
 [Alias('PSPath')]
 [ValidateNotNullOrEmpty()]
 [string]
 ${LiteralPath},
 [switch]
 ${Force},
 [Alias('NoOverwrite')]
 [switch]
 ${NoClobber},
[ValidateSet('Unicode','UTF7','UTF8','ASCII','UTF32','BigEndianUnicode','Default','OEM')]
 [string]
 ${Encoding},
 [switch]
 ${Append},
 #we deleted the Delimiter parameter that used to be here
 [Parameter(ParameterSetName='UseCulture')]
 [switch]
 ${UseCulture},
 [Alias('NTI')]
 [switch]
 ${NoTypeInformation})

begin
{
 try {
 $outBuffer = $null
 if ($PSBoundParameters.TryGetValue('OutBuffer', [ref]$outBuffer))
 {
 $PSBoundParameters['OutBuffer'] = 1
 }
 $wrappedCmd = $ExecutionContext.InvokeCommand.GetCommand('ExportCsv', [System.Management.Automation.CommandTypes]::Cmdlet)
 <#
 we added a hard coded reference to include the original -delimiter parameter
 with the tab character.
 #>
 $scriptCmd = { & $wrappedCmd @PSBoundParameters -delimiter "`t"}
 $steppablePipeline = $scriptCmd.GetSteppablePipeline($myInvocation.CommandOrigin)
 $steppablePipeline.Begin($PSCmdlet)
 } catch {
 throw
 }
}
process
{
 try {
 $steppablePipeline.Process($_)
 } catch {
 throw
 }
}
end
{
 try {
 $steppablePipeline.End()
 } catch {
 throw
 }
}
#We deleted the links for forwarded help
} #end function
#test it out
Get-Service -Name winrm | Export-TDF c:\services.tdf
5

You have a typo in your code, you’re missing the - in Export-Csv

So this:

$wrappedCmd = $ExecutionContext.InvokeCommand.GetCommand('ExportCsv', [System.Management.Automation.CommandTypes]::Cmdlet)

Should be:

$wrappedCmd = $ExecutionContext.InvokeCommand.GetCommand('Export-Csv', [System.Management.Automation.CommandTypes]::Cmdlet)
1 Like
6

where are my glasses , thank you very very much