Powershell - Applying a looped function to subdirectories - powershell

Question

I am new to Powershell and am struggling a bit. I have obtained an example of the sort of function I want to use and adapted it partially. What I want is for it to loop through each subdirectory of C:\Test\, and combine just the PDFs in each subdirectory together (leaving the resulting PDF in each subdirectory).
At the moment I can get it to comb through the subdirectories, but it then combines the contents of all subdirectories into one giant PDF in the top level directory, which is not what I want. I feel like maybe I need to use an array of sorts but I don't know Powershell well enough yet.
BTW this uses PDFSharp - a .Net library.
Function PDFCombine {
$filepath = 'C:\Test\'
$filename = '.\Combined' #<--- ???
$output = New-Object PdfSharp.Pdf.PdfDocument
$PdfReader = [PdfSharp.Pdf.IO.PdfReader]
$PdfDocumentOpenMode = [PdfSharp.Pdf.IO.PdfDocumentOpenMode]
foreach($i in (gci $filepath *.pdf -Recurse)) {
$input = New-Object PdfSharp.Pdf.PdfDocument
$input = $PdfReader::Open($i.fullname, $PdfDocumentOpenMode::Import)
$input.Pages | %{$output.AddPage($_)}
}
$output.Save($filename)
}

Answer 1

Your question was unclear about how many levels you need to go down. You can try this (untested). It goes one level down from $filepath, gets all pdf files in that folder and it's subfolders and combines them into Subfoldername-Combined.pdf:
Function PDFCombine {
$filepath = 'C:\Test\'
$PdfReader = [PdfSharp.Pdf.IO.PdfReader]
$PdfDocumentOpenMode = [PdfSharp.Pdf.IO.PdfDocumentOpenMode]
#Foreach subfolder(FIRST LEVEL ONLY!)
Get-ChildItem $filepath | Where-Object { $_.PSIsContainer } | Foreach-Object {
#Create new ouput pdf-file
$output = New-Object PdfSharp.Pdf.PdfDocument
$outfilepath = Join-Path $_.FullName "$($_.Name)-Combined.pdf"
#Find and add pdf files in subfolders
Get-ChildItem -Path $_.FullName -Filter *.pdf -Recurse | ForEach-Object {
#$input = New-Object PdfSharp.Pdf.PdfDocument #Don't think this one's necessary
$input = $PdfReader::Open($_.fullname, $PdfDocumentOpenMode::Import)
$input.Pages | %{ $output.AddPage($_) }
}
#Save
$output.Save($outfilepath)
}
}
So you should get this:
c:\Test\Folder1\Folder1-Combined.pdf #should include all pages in Folder1 and ANY subfolders below)
c:\Test\Folder2\Folder2-Combined.pdf #should include all pages in Folder2 and ANY subfolders below)
#etc.
If you need it to create a combined pdf for every subfolder(not only the first level), then you could try this(untested):
Function PDFCombine {
$filepath = 'C:\Test\'
$PdfReader = [PdfSharp.Pdf.IO.PdfReader]
$PdfDocumentOpenMode = [PdfSharp.Pdf.IO.PdfDocumentOpenMode]
#Foreach subfolder with pdf files
Get-ChildItem -Path $filepath -Filter *.pdf -Recurse | Group-Object DirectoryName | ForEach-Object {
#Create new ouput pdf-file
$output = New-Object PdfSharp.Pdf.PdfDocument
$outfilepath = Join-Path $_.Name "Combined.pdf"
#Find and add pdf files in subfolders
$_.Group | ForEach-Object {
#$input = New-Object PdfSharp.Pdf.PdfDocument #I don't think you need this
$input = $PdfReader::Open($_.fullname, $PdfDocumentOpenMode::Import)
$input.Pages | %{ $output.AddPage($_) }
}
#Save
$output.Save($outfilepath)
#Remove output-object
Remove-Variable output
}
}

Answer 2

not tested ...
Function PDFCombine {
$filepath = 'C:\Test\'
$filename = '.\Combined' #<--- ???
$output = New-Object PdfSharp.Pdf.PdfDocument
$PdfReader = [PdfSharp.Pdf.IO.PdfReader]
$PdfDocumentOpenMode = [PdfSharp.Pdf.IO.PdfDocumentOpenMode]
$lastdir=""
foreach($i in (gci $filepath *.pdf -Recurse)) {
$input = New-Object PdfSharp.Pdf.PdfDocument
$input = $PdfReader::Open($i.fullname, $PdfDocumentOpenMode::Import)
$input.Pages | %{$output.AddPage($_)}
if ($lastdir -ne $_.directoryname){
$lastdir=$_.directoryname
$output.Save("$lastdir\$filename")
$output = New-Object PdfSharp.Pdf.PdfDocument
}
}
}