''' <summary>
''' Shows information about PPTX document from metadata tree.
''' </summary>
''' <param name="pptxFilename">A name of PPTX file.</param>
Public Shared Sub ShowPptxDocumentInfoFromMetadataTree(pptxFilename As String)
    ' create image collection
    Using images As New Vintasoft.Imaging.ImageCollection()
        ' add PPTX document to the image collection
        images.Add(pptxFilename)
        ' if image collection has images/pages
        If images.Count > 0 Then
            ' get the first image/page
            Dim firstImage As Vintasoft.Imaging.VintasoftImage = images(0)

            ' get PptxDocumentMetadata object from the metadata tree of PPTX decoder
            Dim pptxDocumentMetadata As Vintasoft.Imaging.Metadata.PptxDocumentMetadata = TryCast(firstImage.SourceInfo.Decoder.GetDocumentMetadata(), Vintasoft.Imaging.Metadata.PptxDocumentMetadata)
            ' if PptxDocumentMetadata object is found
            If pptxDocumentMetadata IsNot Nothing Then
                ' get PPTX document from PptxDocumentMetadata object
                Dim pptxDocument As Vintasoft.Imaging.Office.OpenXml.Pptx.PptxDocument = pptxDocumentMetadata.Document

                ' show information about PPTX document

                System.Console.WriteLine(String.Format("PPTX document ""{0}"" information:", pptxFilename))
                System.Console.WriteLine(String.Format(" - Page count: {0}", pptxDocument.Pages.Count))
                System.Console.WriteLine(String.Format(" - Category: {0}", pptxDocument.DocumentInformation.Category))
                System.Console.WriteLine(String.Format(" - ContentStatus: {0}", pptxDocument.DocumentInformation.ContentStatus))
                System.Console.WriteLine(String.Format(" - ContentType: {0}", pptxDocument.DocumentInformation.ContentType))
                System.Console.WriteLine(String.Format(" - Created: {0}", pptxDocument.DocumentInformation.Created))
                System.Console.WriteLine(String.Format(" - Creator: {0}", pptxDocument.DocumentInformation.Creator))
                System.Console.WriteLine(String.Format(" - Description: {0}", pptxDocument.DocumentInformation.Description))
                System.Console.WriteLine(String.Format(" - Identifier: {0}", pptxDocument.DocumentInformation.Identifier))
                System.Console.WriteLine(String.Format(" - Keywords: {0}", pptxDocument.DocumentInformation.Keywords))
                System.Console.WriteLine(String.Format(" - Language: {0}", pptxDocument.DocumentInformation.Language))
                System.Console.WriteLine(String.Format(" - LastModifiedBy: {0}", pptxDocument.DocumentInformation.LastModifiedBy))
                System.Console.WriteLine(String.Format(" - LastPrinted: {0}", pptxDocument.DocumentInformation.LastPrinted))
                System.Console.WriteLine(String.Format(" - Modified: {0}", pptxDocument.DocumentInformation.Modified))
                System.Console.WriteLine(String.Format(" - Revision: {0}", pptxDocument.DocumentInformation.Revision))
                System.Console.WriteLine(String.Format(" - Subject: {0}", pptxDocument.DocumentInformation.Subject))
                System.Console.WriteLine(String.Format(" - Title: {0}", pptxDocument.DocumentInformation.Title))
                System.Console.WriteLine(String.Format(" - Version: {0}", pptxDocument.DocumentInformation.Version))
            End If

            images.ClearAndDisposeItems()
        End If
    End Using
End Sub

/// <summary>
/// Shows information about PPTX document from metadata tree.
/// </summary>
/// <param name="pptxFilename">A name of PPTX file.</param>
public static void ShowPptxDocumentInfoFromMetadataTree(string pptxFilename)
{
    // create image collection
    using (Vintasoft.Imaging.ImageCollection images = new Vintasoft.Imaging.ImageCollection())
    {
        // add PPTX document to the image collection
        images.Add(pptxFilename);
        // if image collection has images/pages
        if (images.Count > 0)
        {
            // get the first image/page
            Vintasoft.Imaging.VintasoftImage firstImage = images[0];

            // get PptxDocumentMetadata object from the metadata tree of PPTX decoder
            Vintasoft.Imaging.Metadata.PptxDocumentMetadata pptxDocumentMetadata =
                firstImage.SourceInfo.Decoder.GetDocumentMetadata() as Vintasoft.Imaging.Metadata.PptxDocumentMetadata;
            // if PptxDocumentMetadata object is found
            if (pptxDocumentMetadata != null)
            {
                // get PPTX document from PptxDocumentMetadata object
                Vintasoft.Imaging.Office.OpenXml.Pptx.PptxDocument pptxDocument =
                    pptxDocumentMetadata.Document;

                // show information about PPTX document

                System.Console.WriteLine(string.Format("PPTX document \"{0}\" information:", pptxFilename));
                System.Console.WriteLine(string.Format(" - Page count: {0}", pptxDocument.Pages.Count));
                System.Console.WriteLine(string.Format(" - Category: {0}", pptxDocument.DocumentInformation.Category));
                System.Console.WriteLine(string.Format(" - ContentStatus: {0}", pptxDocument.DocumentInformation.ContentStatus));
                System.Console.WriteLine(string.Format(" - ContentType: {0}", pptxDocument.DocumentInformation.ContentType));
                System.Console.WriteLine(string.Format(" - Created: {0}", pptxDocument.DocumentInformation.Created));
                System.Console.WriteLine(string.Format(" - Creator: {0}", pptxDocument.DocumentInformation.Creator));
                System.Console.WriteLine(string.Format(" - Description: {0}", pptxDocument.DocumentInformation.Description));
                System.Console.WriteLine(string.Format(" - Identifier: {0}", pptxDocument.DocumentInformation.Identifier));
                System.Console.WriteLine(string.Format(" - Keywords: {0}", pptxDocument.DocumentInformation.Keywords));
                System.Console.WriteLine(string.Format(" - Language: {0}", pptxDocument.DocumentInformation.Language));
                System.Console.WriteLine(string.Format(" - LastModifiedBy: {0}", pptxDocument.DocumentInformation.LastModifiedBy));
                System.Console.WriteLine(string.Format(" - LastPrinted: {0}", pptxDocument.DocumentInformation.LastPrinted));
                System.Console.WriteLine(string.Format(" - Modified: {0}", pptxDocument.DocumentInformation.Modified));
                System.Console.WriteLine(string.Format(" - Revision: {0}", pptxDocument.DocumentInformation.Revision));
                System.Console.WriteLine(string.Format(" - Subject: {0}", pptxDocument.DocumentInformation.Subject));
                System.Console.WriteLine(string.Format(" - Title: {0}", pptxDocument.DocumentInformation.Title));
                System.Console.WriteLine(string.Format(" - Version: {0}", pptxDocument.DocumentInformation.Version));
            }

            images.ClearAndDisposeItems();
        }
    }
}