PowerShell script - Converting PDFs to TIFs using Ghostscript - powershell

Question

What am I missing here?
I'm getting this error:
ERROR converting File
E:\DocuTA\TIFs\06fef98e-e1c5-405e-93ea-c684ee7a856d.tif
nvoke-Expression : You must provide a value expression on the
right-hand side of the '-' operator. At E:\DocuTA\ConvPDFtoTIF.ps1:31
char:26 + $ret = invoke-expression <<<< -command $cmdline +
CategoryInfo : ParserError: (:) [Invoke-Expression], ParseException +
FullyQualifiedErrorId :
ExpectedValueExpression,Microsoft.PowerShell.Commands.InvokeExpressionCommand
when running this script:
#recursively crawls the directory tree and converts pdf files to tif files
#compresses the images to a smaller file size.
$Now = get-date
$Days = "14"
$LastWrite = $Now.AddDays(-$Days)
$srcfolder = "E:\DocuTA\PDFs\"
$destfolder = "E:\DocuTA\TIFs\"
$convert = "& C:\Program Files (x86)\gs\gs9.16\bin\gswin32c.exe"
$filter = "*.pdf"
$dest_ext = "tif"
$arg1 = #(" -dNOPAUSE -dQUIET -r300x300 -sDEVICE=tiffg4 -dBATCH ")
$lfpath = "E:\DocuTA\Logs\"
$logfile = new-item -type file -name "PDF2TIFLog$(get-date -uformat '%Y%m%d%H%M%S').log" -path "$lfpath"
$elogfile = "E:\DocuTA\Logs\PDF2TIFErrorLog.log"
#-------------------------------------------------------------------
$count = 0
Write-Output "`nStarting ... ($Now)" | Out-File -Append $logfile
Try
{
foreach ($srcitem in $(Get-ChildItem $srcfolder -Include $filter -Recurse | Where-Object {$_.LastWriteTime -gt "$LastWrite"}))
{
$count++
$srcname = $srcitem.FullName
$partial = $srcitem.FullName.Substring($srcfolder.Length)
$destname = $destfolder+$partial
$destname = [System.IO.Path]::ChangeExtension($destname,$dest_ext)
$destpath = [System.IO.Path]::GetDirectoryName($destname)
$cmdline = "'"+$convert+"'"+"'"+$srcname+"'"+$arg1+ "'"+$destname+"'"
Write-Output "[$count] $cmdline" | Out-File -Append $logfile
$ret = invoke-expression -command $cmdline
Write-Output "[$count] OUTPUT: $ret" | Out-File -Append $logfile
Write-Output "[$count] processed file." | Out-File -Append $logfile
}
}
Catch
{
$Now | out-file -Append $elogfile
write-output "ERROR converting File $destname" | out-file -Append $elogfile
Write-Output $Error[0] | out-file -Append $elogfile
}
Finally
{
Write-Output "Finished processing files. Total: $count`n" | Out-File -Append $logfile
}

Answer 1

Looks like PowerShell doesn't like using - for switches, try using # instead