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iText

Download .NET prerequisites

The following simple PowerShell script downloads the necessary DLLs to use iText in PowerShell. 
set-strictMode -version 3

add-Type -assembly System.IO.Compression.FileSystem

function download-NuGet-package {
   param (
      [string  ] $name,
      [string  ] $version,
      [string[]] $dllPaths
   )

   write-host "Downloading $name - $version"

   $downloadURL = "https://www.nuget.org/api/v2/package/$name/$version"
   invoke-webRequest $downloadURL -outFile $env:temp/nugetPkg.zip
   $zip = [IO.Compression.ZipFile]::OpenRead("$env:temp/nugetPkg.zip")

   foreach ($dllPath in $dllPaths) {
      $dllName = $dllPath -replace '.*[/\\](.*)', '$1'
      [IO.Compression.ZipFileExtensions]::ExtractToFile($zip.GetEntry($dllPath), "$psScriptRoot/$dllname")
   }

   $zip.Dispose()
}


download-NuGet-package BouncyCastle                                             1.8.9     lib/BouncyCastle.Crypto.dll
download-NuGet-package itext7.commons                                           7.2.0     lib/net461/itext.commons.dll
download-NuGet-package itext7                                                   7.2.0     lib/net461/itext.kernel.dll, lib/net461/itext.io.dll, lib/net461/itext.layout.dll
download-NuGet-package Microsoft.Bcl.AsyncInterfaces                            5.0.0     lib/net461/Microsoft.Bcl.AsyncInterfaces.dll
download-NuGet-package Microsoft.Extensions.Logging                             5.0.0     lib/net461/Microsoft.Extensions.Logging.dll
download-NuGet-package Microsoft.Extensions.DependencyInjection                 5.0.2     lib/net461/Microsoft.Extensions.DependencyInjection.dll
download-NuGet-package Microsoft.Extensions.DependencyInjection.Abstractions    5.0.0     lib/net461/Microsoft.Extensions.DependencyInjection.Abstractions.dll
download-NuGet-package Microsoft.Extensions.Logging.Abstractions                5.0.0     lib/net461/Microsoft.Extensions.Logging.Abstractions.dll
download-NuGet-package Microsoft.Extensions.Options                             5.0.0     lib/net461/Microsoft.Extensions.Options.dll
download-NuGet-package Microsoft.Extensions.Primitives                          5.0.0     lib/net461/Microsoft.Extensions.Primitives.dll
download-NuGet-package System.Threading.Tasks.Extensions                        4.5.4     lib/net461/System.Threading.Tasks.Extensions.dll
download-NuGet-package System.Memory                                            4.5.4     lib/net461/System.Memory.dll
download-NuGet-package System.Runtime.CompilerServices.Unsafe                   5.0.0     lib/net45/System.Runtime.CompilerServices.Unsafe.dll
download-NuGet-package System.Diagnostics.DiagnosticSource                      5.0.1     lib/net46/System.Diagnostics.DiagnosticSource.dll
download-NuGet-package System.ValueTuple                                        4.5.0     lib/net461/System.ValueTuple.dll
Github repository about-iText, path: /lib/download-NuGet-packages.ps1

add-types.ps1

add-types.ps1 adds the necessary types to a PowerShell session so that iText can be used from PowerShell. 
$libDir = "$psScriptRoot/lib"

add-type -path $libDir/BouncyCastle.Crypto.dll
add-type -path $libDir/itext.commons.dll
add-type -path $libDir/itext.io.dll
add-type -path $libDir/itext.kernel.dll
add-type -path $libDir/itext.layout.dll
add-type -path $libDir/System.Threading.Tasks.Extensions.dll
add-type -path $libDir/Microsoft.Bcl.AsyncInterfaces.dll
add-type -path $libDir/Microsoft.Extensions.DependencyInjection.Abstractions.dll
add-type -path $libDir/Microsoft.Extensions.DependencyInjection.dll
add-type -path $libDir/Microsoft.Extensions.Logging.Abstractions.dll
add-type -path $libDir/Microsoft.Extensions.Logging.dll
add-type -path $libDir/Microsoft.Extensions.Options.dll
add-type -path $libDir/Microsoft.Extensions.Primitives.dll
add-type -path $libDir/System.Diagnostics.DiagnosticSource.dll
add-type -path $libDir/System.Memory.dll
add-type -path $libDir/System.Runtime.CompilerServices.Unsafe.dll
add-type -path $libDir/System.ValueTuple.dll
Github repository about-iText, path: /add-types.ps1

Hello World

A simple Hello World that creates a PDF document: 
. ./add-types.ps1

$pdfWriter   = [iText.Kernel.Pdf.PdfWriter    ]::new("$psScriptRoot/Hello-World.pdf")
$pdfDocument = [iText.Kernel.Pdf.PdfDocument  ]::new($pdfWriter                     )
$document    = [itext.Layout.Document         ]::new($pdfDocument                   )
$paragraph   = [iText.Layout.Element.Paragraph]::new('Hello World!'                 )

$null = $document.Add($paragraph)

$pdfDocument.Close()
Github repository about-iText, path: /hello-world.ps1
Same thing, but with using namespace: 
using namespace iText.Kernel.Pdf
using namespace iText.Layout
using namespace iText.Layout.Element

. ./add-types.ps1

$pdfWriter   = [PdfWriter  ]::new("$psScriptRoot/Hello-World-using-namepsace.pdf")
$pdfDocument = [PdfDocument]::new($pdfWriter                                     )
$document    = [Document   ]::new($pdfDocument                                   )
$paragraph   = [Paragraph  ]::new('Hello World!'                                 )

$null = $document.Add($paragraph)

$pdfDocument.Close()
Github repository about-iText, path: /hello-world-using-namespace.ps1

Extract text from a PDF document

This script extracts text from from a PDF document: 
using namespace iText.Layout
using namespace iText.Layout.Element
using namespace iText.Kernel.Pdf
using namespace iText.Kernel.Pdf.Canvas.Parser
using namespace iText.Kernel.Pdf.Canvas.Parser.Listener

param (
   [string] $pdfName
)

if (-not (test-path $pdfName)) {
   write-host "$pdfName does not exist"
   return
}

. ./add-types.ps1

#
#  A PdfReader reads and parses a PDF document.
#
$pdfReader = [PdfReader]::new($pdfName);

$pdfDocument = [iText.Kernel.Pdf.PdfDocument]::new($pdfReader)
$totalPages = $pdfDocument.GetNumberOfPages()
write-host "Number of pages: $totalPages"


[ITextExtractionStrategy] $strategy = [SimpleTextExtractionStrategy]::new()
for ($p = 1; $p -le $totalPages; $p++) {
   write-host "  page: $p"
   $page = $pdfDocument.GetPage($p)
   $text = [PdfTextExtractor]::GetTextFromPage($page, $strategy);

   write-host $text
}

$pdfReader.Close();
Github repository about-iText, path: /extract-text.ps1

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