PrintOut 代码适用于 PowerShell v 5.1，但不适用于 7.3

Question

I am trying to print parts of several docx files. The code below works in Windows PowerShell 5.1, but not in PowerShell 7.3. I would like to understand why and help updating the code so it works in PowerShell 7.3.

$path = 'D:\SchoolWeb\DOCXtoPDF\test.docx' #Path to docx

$Word = New-Object -ComObject Word.Application #open MS Word app
$Word.Visible = $false #hide the MS Word app
$docx = $Word.Documents.Open($path) #Open the docx from the path into the open MS Word app

$pagesNum = $Word.ActiveDocument.ComputeStatistics([Microsoft.Office.Interop.Word.WdStatistic]::wdStatisticPages) #Get the number of pages in the docx
$max=$pagesNum-2 #Get the maximum pages because the last two pages are not important

$Missing    = [System.Reflection.Missing]::Value  # Default values
$BackGround = 0
$Append     = 0
$Range      = 4 #https://learn.microsoft.com/en-us/office/vba/api/word.wdprintoutrange
$OutputFileName = $Missing
$From       = $Missing # values I've tried "1"
$To     = $Missing # values I've tried $max
$Item       = 0
$Copies     = 1
#$Pages = $max # values I've tried 
if ($max -gt 1) { $Pages = "1-$max" } else { $Pages = "1" }
    
$Word.PrintOut([ref]$BackGround, [ref]$Append, [ref]$Range, [ref]$OutputFileName, [ref]$From, [ref]$To, [ref]$Item, [ref]$Copies, [ref]$Pages)

$docx.Close($false)
$Word.Quit()

In Powershell 7.3, I get a MethodException "Exception setting "PrintOut": Cannot convert the "1" value of type "string" to type "Object"."

I know this relates to the $Pages variable.

Here are some places I already looked:

• Link 1

• Link 2

• Link 3

• Link 4

Thank you for explaining why the code works in one PowerShell and not the other and helping me to correct the code so it works in PowerShell 7.3.

Answer 1

Not sure where it goes sideways...
I suspect the parameter types (not just pages ) are not correctly aligned their position).
Anyways, to resolve your issue, I recommend you to use named parameters. See this answer: How to call a complex COM method from PowerShell?

$Word.GetType().InvokeMember('PrintOut', [System.Reflection.BindingFlags]::InvokeMethod,
    $null,  ## Binder
    $Word,  ## Target
    ([Object[]]1),  ## Args
    $null,  ## Modifiers
    $null,  ## Culture
    ([String[]]'Pages')  ## NamedParameters
)

or using the function in the referenced answer:

Invoke-NamedParameter $Word Printout @{ Pages = 1 }