$path = "."

# Convert all the ppt/pptx to PDF

$powerpoint_app = New-Object -ComObject PowerPoint.Application
# $powerpoint_app.Visible = [Microsoft.Office.Core.MsoTriState]::msoFalse

# Search for files and convert
Get-ChildItem -Path $path -Filter *.ppt? | ForEach-Object {
    # $ppSlideSizeOpt = [Microsoft.Office.Interop.PowerPoint.PpSlideSizeType]::ppSlideSizeOnScreen16x9

    # Open the presentation
    echo "# Opening the '$($_.BaseName)'..."
    $presentation = $powerpoint_app.Presentations.Open($_.FullName)
    $pdf_filename = "$($_.DirectoryName)\$($_.BaseName).pdf"

    # Resize the slide size to 16x9 if it's not yet
    if ($presentation.PageSetup.SlideWidth -ne 960)
    {
        $presentation.PageSetup.SlideWidth = 960
        $presentation.PageSetup.SlideHeight = 540
        $presentation.Save()
        echo "- Set the slide size to WideScreen. Saved it."
    } else
    {
        echo "- The slide size WAS WideScreen."
    }

    # Save as a PDF
    echo "- Saving as PDF ..."
    $opt = [Microsoft.Office.Interop.PowerPoint.PpSaveAsFileType]::ppSaveAsPDF
    $presentation.SaveAs($pdf_filename, $opt)

    # Close the presentation object
    $presentation.Close()

    echo "- Saved as the '$($_.BaseName).pdf'"
}

sleep 3
# Quit the app and release the app object
$powerpoint_app.Quit()
Stop-Process -name "POWERPNT"
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($powerpoint_app)