Kommandozeilen QR-Code und Barcode-Leser für die PowerShell

# Install =====================================================================

# Installs the ZXing.Net library in the Global Assembly Cache (GAC). The ZXing.Net
# library supports decoding and generating of barcodes (like QR Code, PDF 417, EAN,
# UPC, Aztec, Data Matrix, Codabar) within images. ZXing.Net is a port of the java
# based barcode reader and generator library ZXing (see https://github.com/zxing/zxing)
# All credits for the library go to Michael Jahn (see https://github.com/micjahn/ZXing.Net
# for more information)
function Install-ZXing() {
    Require-AdministrativeRights
    Run-InPowershellDesktop

    Write-Host  "$($MyInvocation.MyCommand.Name): Install Barcode reader..."

    $json = $(Invoke-WebRequest -UserAgent "Wget" -Uri "https://api.github.com/repos/micjahn/ZXing.Net/releases/latest").Content | ConvertFrom-Json
    $json.Assets | %{
        # $_.browser_download_url
    
        if($_.browser_download_url -match 'ZXing.Net.[0-9]+.[0-9]+.[0-9]+.[0-9]+.zip') {
            # $Matches.0

            # Load ZXing.Net and expand zip archive
            Invoke-WebRequest -UserAgent "Wget" -Uri $_.browser_download_url -OutFile "$env:USERPROFILE\Downloads\$($Matches.0)"
            $s = [System.IO.Path]::GetFileNameWithoutExtension($Matches.0)
            md "$env:USERPROFILE\Downloads\$s" -Force | Out-Null
            Expand-Archive "$env:USERPROFILE\Downloads\$($Matches.0)" -DestinationPath "$env:USERPROFILE\Downloads\$s\" -Force

            # Remove old versions
            Remove-GAC("$env:USERPROFILE\Downloads\$s\net4.8\zxing.dll")

            # Install current version
            Install-GAC("$env:USERPROFILE\Downloads\$s\net4.8\zxing.dll")

            #Cleanup
            rm "$env:USERPROFILE\Downloads\$s\" -Recurse -Force -ErrorAction SilentlyContinue
            rm "$env:USERPROFILE\Downloads\$($Matches.0)" -Force -ErrorAction SilentlyContinue
        }
    }
}

# Installs a dll in the Global Assembly Cache (GAC)
# REMARKS: Requires administrative rights
function Install-GAC([string]$path) {
    Add-Type -AssemblyName System.EnterpriseServices
    $pub = New-Object System.EnterpriseServices.Internal.Publish
    $pub.GacInstall($path)
}

# Removes a dll from the Global Assembly Cache (GAC)
# REMARKS: Requires administrative rights
function Remove-GAC([string]$path) {
    Add-Type -AssemblyName System.EnterpriseServices
    $pub = New-Object System.EnterpriseServices.Internal.Publish
    $pub.GacRemove($path)
}

# Read Bar- or QR-Code image file into a Bitmap
$stm = New-Object IO.FileStream $_, 'Open', 'Read'
$bmp = [System.Drawing.Bitmap]::FromStream($stm)    #Remarks: Use FromStream because FromFile doesn't close the stream after reading
$stm.Close()

# Decode barcode with ZXing.Net
$src = new-object ZXing.BitmapLuminanceSource($bmp)
$rd = new-object ZXing.BarcodeReader
$rd.AutoRotate = $true
$res = $rd.Decode($src)
Write-Verbose $res.Text

$res.Text