Codecs: How to work with secured DOCX file?

VintaSoft Imaging .NET SDK allows to open and view secured DOCX document. Opened secured DOCX document cannot be edited but can be saved to a new not secured DOCX document.

Here is C#/VB.NET code that shows how convert secured DOCX file to a multipage TIFF file:

/// <summary>
/// Converts encrypted DOCX document to a TIFF file using ImageCollection and TiffEncoder classes.
/// DOCX document is rendered with specified resolution.
/// </summary>
public static void ConvertEncryptedDocxToTiff(string docxFileName, string password, string tiffFileName, float dpi)
{
    System.IO.Stream docxFileStream = System.IO.File.OpenRead(docxFileName);

    // if document is encrypted
    if (Vintasoft.Imaging.Office.OfficeDocumentCryptography.IsSecuredOfficeDocument(docxFileStream))
    {
        // create memory stream
        System.IO.MemoryStream docxDectyptedFileStream = new System.IO.MemoryStream();
        // try to decrypt DOCX document and save not encrypted DOCX document to a stream
        bool result = Vintasoft.Imaging.Office.OfficeDocumentCryptography.TryDecryptOfficeDocument(docxFileStream, password, docxDectyptedFileStream);
        // if DOCX document password is not correct
        if (!result)
            throw new System.Exception("Invalid password.");

        docxFileStream.Dispose();
        docxFileStream = docxDectyptedFileStream;
    }

    using (docxFileStream)
    {
        // create image collection
        using (Vintasoft.Imaging.ImageCollection imageCollection = new Vintasoft.Imaging.ImageCollection())
        {
            // add DOCX document to image collection
            imageCollection.Add(docxFileStream);

            // set rendering settings
            imageCollection.SetRenderingSettings(new Vintasoft.Imaging.Codecs.Decoders.RenderingSettings(dpi, dpi));

            // create TiffEncoder
            using (Vintasoft.Imaging.Codecs.Encoders.TiffEncoder tiffEncoder =
                new Vintasoft.Imaging.Codecs.Encoders.TiffEncoder(true))
            {
                // set TIFF compression to Zip
                tiffEncoder.Settings.Compression =
                    Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffCompression.Zip;

                // save images (rendered DOCX pages) of image collection to TIFF file using TiffEncoder
                imageCollection.SaveSync(tiffFileName, tiffEncoder);
            }

            // dispose images
            imageCollection.ClearAndDisposeItems();
        }
    }
}

VB.NET

''' <summary>
''' Converts encrypted DOCX document to a TIFF file using ImageCollection and TiffEncoder classes.
''' DOCX document is rendered with specified resolution.
''' </summary>
Public Shared Sub ConvertEncryptedDocxToTiff(docxFileName As String, password As String, tiffFileName As String, dpi As Single)
    Dim docxFileStream As System.IO.Stream = System.IO.File.OpenRead(docxFileName)

    ' if document is encrypted
    If Vintasoft.Imaging.Office.OfficeDocumentCryptography.IsSecuredOfficeDocument(docxFileStream) Then
        ' create memory stream
        Dim docxDectyptedFileStream As New System.IO.MemoryStream()
        ' try to decrypt DOCX document and save not encrypted DOCX document to a stream
        Dim result As Boolean = Vintasoft.Imaging.Office.OfficeDocumentCryptography.TryDecryptOfficeDocument(docxFileStream, password, docxDectyptedFileStream)
        ' if DOCX document password is not correct
        If Not result Then
            Throw New System.Exception("Invalid password.")
        End If

        docxFileStream.Dispose()
        docxFileStream = docxDectyptedFileStream
    End If

    Using docxFileStream
        ' create image collection
        Using imageCollection As New Vintasoft.Imaging.ImageCollection()
            ' add DOCX document to image collection
            imageCollection.Add(docxFileStream)

            ' set rendering settings
            imageCollection.SetRenderingSettings(New Vintasoft.Imaging.Codecs.Decoders.RenderingSettings(dpi, dpi))

            ' create TiffEncoder
            Using tiffEncoder As New Vintasoft.Imaging.Codecs.Encoders.TiffEncoder(True)
                ' set TIFF compression to Zip
                tiffEncoder.Settings.Compression = Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffCompression.Zip

                ' save images (rendered DOCX pages) of image collection to TIFF file using TiffEncoder
                imageCollection.SaveSync(tiffFileName, tiffEncoder)
            End Using

            ' dispose images
            imageCollection.ClearAndDisposeItems()
        End Using
    End Using
End Sub

Here is C#/VB.NET code that shows how open secured DOCX file and save it to a not secured DOCX file:

/// <summary>
/// Converts encrypted DOCX document to not encrypted DOCX document.
/// </summary>
public static void ConvertEncryptedDocxToDocx(string docxFileName, string password, string resultDocxFileName)
{
    // if document is encrypted
    if (Vintasoft.Imaging.Office.OfficeDocumentCryptography.IsSecuredOfficeDocument(docxFileName))
    {
        // try to decrypt DOCX document and save not encrypted DOCX document to a new file
        bool result = Vintasoft.Imaging.Office.OfficeDocumentCryptography.TryDecryptOfficeDocument(docxFileName, password, resultDocxFileName);
        // if DOCX document password is not correct
        if (!result)
            throw new System.Exception("Invalid password.");
    }
    // if document is not encrypted
    else
    {
        System.IO.File.Copy(docxFileName, resultDocxFileName, true);
    }
}

VB.NET

''' <summary>
''' Converts encrypted DOCX document to not encrypted DOCX document.
''' </summary>
Public Shared Sub ConvertEncryptedDocxToDocx(docxFileName As String, password As String, resultDocxFileName As String)
    ' if document is encrypted
    If Vintasoft.Imaging.Office.OfficeDocumentCryptography.IsSecuredOfficeDocument(docxFileName) Then
        ' try to decrypt DOCX document and save not encrypted DOCX document to a new file
        Dim result As Boolean = Vintasoft.Imaging.Office.OfficeDocumentCryptography.TryDecryptOfficeDocument(docxFileName, password, resultDocxFileName)
        ' if DOCX document password is not correct
        If Not result Then
            Throw New System.Exception("Invalid password.")
        End If
    Else
        ' if document is not encrypted
        System.IO.File.Copy(docxFileName, resultDocxFileName, True)
    End If
End Sub

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