Batch convert Pagemaker files to PDF

pagemaker-to-pdf.ps1

# An afternoon hack script to convert 100's of old Pagemaker files into PDF for reading
# Got tired looking for a good converter. Almost none exist..... Some bad business Adobe !
# Requires Powershell, WASP, Adobe Pagemaker (running as PM70, modify otherwise) with Distiller PDF conversion support
# If some files are not converted, do a re-run of the script, which processes the PMD files for which PDF file has not been created.



$path = "C:\PDFCollection\"

$pmdfilelist = Get-ChildItem $path -filter *.pmd -recurse
$pdffilelist = Get-ChildItem $path -filter *.pdf -recurse     # Do not modify. This is used for re-runs, if u missed to convert any file in the previous run

$pmdnum = $pmdfilelist | measure          # Mostly from some odd job I found in stackoverflow.... Jai ho!
$pdfnum = $pdffilelist | measure
$filecount = $pmdnum.count - $pdfnum.count
 
$i = 0;
#ForEach ($file in $filelist)
Compare-Object $filelist $pdffilelist -Property baseName -passthru | Where-Object {$_.SideIndicator -eq "<="}| ForEach-Object {   # Powershell rocks!


    $i++;
    $pmdfile = $_.fullName
      
    $progress = ($i / $filecount) * 100     # Progress bar !
    $progress = [Math]::Round($progress,2)
     
    Write-Host -------------------------------------------------------------------------------
    Write-Host "Processing - $pmdfile"
    Write-Host "File $i of $filecount - $progress%"
    Write-Host -------------------------------

    Select-Window PM70* | Send-Keys "%FO"     # File -> Open
   
    Select-Window PM70* | Select-ChildWindow | Send-Keys $pmdfile  # Key-in filename
    Select-Window PM70* | Select-ChildWindow | Send-Keys "%o" # Alt-O for Open
    Select-Window PM70* | Select-ChildWindow | Send-Keys "~"  #
    Select-Window PM70* | Select-ChildWindow | Send-Keys "~"  # Carriage Returns for handling some misc errors - Modify if not reqd.
   
    Select-Window PM70* | Send-Keys "%fep"  # File -> Export -> Adobe PDF
    
    Start-Sleep -m 100
    
    Select-Window PM70* | Select-ChildWindow | Send-Keys "%e" # Export (Hopefully you have configured default settings)
    Start-Sleep -m 100
    Select-Window PM70* | Select-ChildWindow | Send-Keys "%e" # Sometimes getting stuck at export !   
    Select-Window PM70* | Select-ChildWindow | Select-ChildWindow | Send-Keys "%v%s" # No-view-pdf, Save
    Select-Window PM70* | Select-ChildWindow | Select-ChildWindow | Select-ChildWindow | Send-Keys "%y" # Handle replace file (if it pops)
    Select-Window PM70* | Select-ChildWindow | Select-ChildWindow | Send-Keys "~" # Handle some misc errors - Unable to view 
    
    Start-Sleep -m 200
    
    Select-Window PM70* | Send-Keys "^{F4}"   # Close window
}                                             # Loop on !!

Hi

I have tried this script but getting the following error-

Compare-Object : Cannot bind argument to parameter 'ReferenceObject' because it is null.
At C:\Users\DeLL\Desktop\pagemaker\pagemaker-to-pdf.ps1:19 char:15

• Compare-Object <<<< $filelist $pdffilelist -Property baseName -passthru | Where-Object {$_.SideIndicator -eq "<="}|
  ForEach-Object { # Powershell rocks!
  • CategoryInfo : InvalidData: (:) [Compare-Object], ParameterBindingValidationException
  • FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.CompareObje
    ctCommand

please guide what am I doing wrong:?