VintaSoft Imaging .NET SDK 15.1: Документация для .NET разработчика
В этом разделе
Введение в метаданные изображения
В этом разделе
Метаданные изображения хранят данные об изображении и определяют такие аспекты, как ключевые слова, GPS местоположение, информацию о камере и многое другое.


SDK предоставляет возможность получать метаданные из файла изображения, редактировать существующие и добавлять новые метаданные. Все эти операции выполняются без загрузки изображения из файла.

SDK позволяет работать со следующими типами метаданных:
Существует 3 метода доступа к метаданным изображения:

Доступ к метаданным объекта VintasoftImage

Класс VintasoftImageMetadata обеспечивает упрощенный доступ к метаданным изображения в случае, если работа с изображением осуществляется с использованием класса VintasoftImage. Доступ к экземпляру класса VintasoftImageMetadata можно получить с помощью свойства VintasoftImage.Metadata.

VintasoftImageMetadata класс предоставляет доступ к:
Вот C#/VB.NET код, который демонстрирует, как получить информацию о пакетах аннотаций, которые хранятся в метаданных JPEG файла: 
public void PrintInfoAboutJpegFileAnnotations(string filename)
{
    // create an instance of VintasoftImage class
    using (Vintasoft.Imaging.VintasoftImage jpegImage = new Vintasoft.Imaging.VintasoftImage(filename))
    {
        // get reference to a metadata tree of JPEG page
        Vintasoft.Imaging.Metadata.MetadataNode jpegPageMetadata = jpegImage.Metadata.MetadataTree;

        // create an instance of MetadataTreeHelper class
        Vintasoft.Imaging.Metadata.MetadataTreeHelper metadataTreeHelper = 
            new Vintasoft.Imaging.Metadata.MetadataTreeHelper(jpegPageMetadata);

        //
        if (!metadataTreeHelper.HasVintasoftBinaryAnnotations &&
            !metadataTreeHelper.HasVintasoftXmpAnnotations)
            System.Console.Write(string.Format("File '{0}' does not have annotations.", filename));
        else
        {
            if (metadataTreeHelper.HasVintasoftBinaryAnnotations)
                System.Console.Write(string.Format("File '{0}' has VintasoftBinary annotations.", filename));

            if (metadataTreeHelper.HasVintasoftXmpAnnotations)
                System.Console.Write(string.Format("File '{0}' has VintasoftXmp annotations.", filename));
        }
    }
}

Public Sub PrintInfoAboutJpegFileAnnotations(filename As String)
    ' create an instance of VintasoftImage class
    Using jpegImage As New Vintasoft.Imaging.VintasoftImage(filename)
        ' get reference to a metadata tree of JPEG page
        Dim jpegPageMetadata As Vintasoft.Imaging.Metadata.MetadataNode = jpegImage.Metadata.MetadataTree

        ' create an instance of MetadataTreeHelper class
        Dim metadataTreeHelper As New Vintasoft.Imaging.Metadata.MetadataTreeHelper(jpegPageMetadata)

        '
        If Not metadataTreeHelper.HasVintasoftBinaryAnnotations AndAlso Not metadataTreeHelper.HasVintasoftXmpAnnotations Then
            System.Console.Write(String.Format("File '{0}' does not have annotations.", filename))
        Else
            If metadataTreeHelper.HasVintasoftBinaryAnnotations Then
                System.Console.Write(String.Format("File '{0}' has VintasoftBinary annotations.", filename))
            End If

            If metadataTreeHelper.HasVintasoftXmpAnnotations Then
                System.Console.Write(String.Format("File '{0}' has VintasoftXmp annotations.", filename))
            End If
        End If
    End Using
End Sub


Дерево метаданных представляет метаданные изображения в виде древовидной структуры. Доступ к дереву метаданных можно получить с помощью свойства VintasoftImageMetadata.MetadataTree.
Корневой узел дерева метаданных представляет страницу файла изображения. Каждый узел дерева может содержать информацию о метаданных изображения и дочерних узлах.


Вот C#/VB.NET код, который демонстрирует, как получить информацию о тегах TIFF файла: 
public void PrintInfoAboutTiffFile(string filename)
{
    // create an image collection
    Vintasoft.Imaging.ImageCollection images = new Vintasoft.Imaging.ImageCollection();
    // add TIFF file to a collection
    images.Add(filename);

    for (int i = 0; i < images.Count; i++)
    {
        System.Console.WriteLine(string.Format("Page {0}", i));

        // get reference to a metadata tree of TIFF page
        Vintasoft.Imaging.Metadata.MetadataNode tiffPageMetadata = images[i].Metadata.MetadataTree;

        // search for tree node that contains information about TIFF IFD
        Vintasoft.Imaging.Metadata.TiffIfdMetadata tiffIfdMetadata = 
            tiffPageMetadata.FindChildNode<Vintasoft.Imaging.Metadata.TiffIfdMetadata>();
        // if tree node that contains information about TIFF IFD is found
        if (tiffIfdMetadata != null)
        {
            // if TIFF IFD is found
            if (tiffIfdMetadata.ImageFileDirectory != null)
                // print info about TIFF IFD data
                PrintInfoAboutTiffIfdData(tiffIfdMetadata.ImageFileDirectory);
        }
    }
}

private void PrintInfoAboutTiffIfdData(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory ifd)
{
    System.Console.WriteLine("  TIFF IFD data:");

    // print info about tag collection of EXIF data
    PrintTiffTagCollectionInfo(ifd.Tags, "    ");

    System.Console.WriteLine();
}

private void PrintTiffTagCollectionInfo(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection tags, string indent)
{
    // print tag count
    System.Console.WriteLine(string.Format("{0}Tags [{1}]:", indent, tags.Count));
    // for each tag
    for (int i = 0; i < tags.Count; i++)
    {
        // print tag info
        System.Console.WriteLine(string.Format("{0}- Id={1}, Name={2}, Data={3}", indent, tags[i].Id, tags[i].Name, tags[i].Data));

        // if tag data is TiffImageFileDirectory
        if (tags[i].Data.GetType() == typeof(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory))
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory subIfd = 
                (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)tags[i].Data;
            // print info about tag collection of sub IFD
            PrintTiffTagCollectionInfo(subIfd.Tags, indent + "  ");
        }
        // if tag data is TiffImageFileDirectory[]
        if (tags[i].Data.GetType() == typeof(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[]))
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[] subIfds = 
                (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[])tags[i].Data;
            for (int j = 0; j < subIfds.Length; j++)
                // print info about tag collection of sub IFD
                PrintTiffTagCollectionInfo(subIfds[j].Tags, indent + "  ");
        }
    }
}

Public Sub PrintInfoAboutTiffFile(filename As String)
    ' create an image collection
    Dim images As New Vintasoft.Imaging.ImageCollection()
    ' add TIFF file to a collection
    images.Add(filename)

    For i As Integer = 0 To images.Count - 1
        System.Console.WriteLine(String.Format("Page {0}", i))

        ' get reference to a metadata tree of TIFF page
        Dim tiffPageMetadata As Vintasoft.Imaging.Metadata.MetadataNode = images(i).Metadata.MetadataTree

        ' search for tree node that contains information about TIFF IFD
        Dim tiffIfdMetadata As Vintasoft.Imaging.Metadata.TiffIfdMetadata = tiffPageMetadata.FindChildNode(Of Vintasoft.Imaging.Metadata.TiffIfdMetadata)()
        ' if tree node that contains information about TIFF IFD is found
        If tiffIfdMetadata IsNot Nothing Then
            ' if TIFF IFD is found
            If tiffIfdMetadata.ImageFileDirectory IsNot Nothing Then
                ' print info about TIFF IFD data
                PrintInfoAboutTiffIfdData(tiffIfdMetadata.ImageFileDirectory)
            End If
        End If
    Next
End Sub

Private Sub PrintInfoAboutTiffIfdData(ifd As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)
    System.Console.WriteLine("  TIFF IFD data:")

    ' print info about tag collection of EXIF data
    PrintTiffTagCollectionInfo(ifd.Tags, "    ")

    System.Console.WriteLine()
End Sub

Private Sub PrintTiffTagCollectionInfo(tags As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection, indent As String)
    ' print tag count
    System.Console.WriteLine(String.Format("{0}Tags [{1}]:", indent, tags.Count))
    ' for each tag
    For i As Integer = 0 To tags.Count - 1
        ' print tag info
        System.Console.WriteLine(String.Format("{0}- Id={1}, Name={2}, Data={3}", indent, tags(i).Id, tags(i).Name, tags(i).Data))

        ' if tag data is TiffImageFileDirectory
        If tags(i).Data.[GetType]() Is GetType(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory) Then
            Dim subIfd As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory = DirectCast(tags(i).Data, Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)
            ' print info about tag collection of sub IFD
            PrintTiffTagCollectionInfo(subIfd.Tags, indent & "  ")
        End If
        ' if tag data is TiffImageFileDirectory[]
        If tags(i).Data.[GetType]() Is GetType(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory()) Then
            Dim subIfds As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory() = DirectCast(tags(i).Data, Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory())
            For j As Integer = 0 To subIfds.Length - 1
                ' print info about tag collection of sub IFD
                PrintTiffTagCollectionInfo(subIfds(j).Tags, indent & "  ")
            Next
        End If
    Next
End Sub


Вот C#/VB.NET код, который демонстрирует, как получить EXIF информация из JPEG файле: 
public void PrintExifInfoAboutJpegFile(string filename)
{
    // create an instance of VintasoftImage class
    using (Vintasoft.Imaging.VintasoftImage jpegImage = new Vintasoft.Imaging.VintasoftImage(filename))
    {
        // get reference to a metadata tree of JPEG page
        Vintasoft.Imaging.Metadata.MetadataNode jpegPageMetadata = jpegImage.Metadata.MetadataTree;
        // search for tree node that contains information about JPEG thumbnail
        Vintasoft.Imaging.Metadata.JpegApp1ExifSegmentMetadata jpegApp1ExifSegmentMetadata = 
            jpegPageMetadata.FindChildNode<Vintasoft.Imaging.Metadata.JpegApp1ExifSegmentMetadata>();
        // if tree node that contains EXIF information is found
        if (jpegApp1ExifSegmentMetadata != null)
        {
            // if EXIF data is found
            if (jpegApp1ExifSegmentMetadata.IFD0 != null)
                // print info about EXIF data
                PrintInfoAboutExifData(jpegApp1ExifSegmentMetadata.IFD0);

            // if EXIF thumbnail data is found
            if (jpegApp1ExifSegmentMetadata.IFD1 != null)
                // print info about EXIF thumbnail data
                PrintInfoAboutExifThumbnailData(jpegApp1ExifSegmentMetadata.IFD1);

            // if EXIF thumbnail is found
            if (jpegApp1ExifSegmentMetadata.Thumbnail != null)
                // print info about EXIF thumbnail
                PrintInfoAboutExifThumbnail(jpegApp1ExifSegmentMetadata.Thumbnail);
        }
    }
}

private void PrintInfoAboutExifData(Vintasoft.Imaging.Metadata.JpegApp1Ifd0Metadata jpegApp1Ifd0Metadata)
{
    System.Console.WriteLine("EXIF data:");

    // print info about tag collection of EXIF data
    PrintExifTagCollectionInfo(jpegApp1Ifd0Metadata.ImageFileDirectory.Tags, "  ");

    System.Console.WriteLine();
}

private void PrintInfoAboutExifThumbnailData(Vintasoft.Imaging.Metadata.JpegApp1Ifd1Metadata jpegApp1Ifd1Metadata)
{
    System.Console.WriteLine("EXIF thumbnail data:");

    // print info about tag collection of EXIF thumbnail data
    PrintExifTagCollectionInfo(jpegApp1Ifd1Metadata.ImageFileDirectory.Tags, "  ");

    System.Console.WriteLine();
}

private void PrintInfoAboutExifThumbnail(Vintasoft.Imaging.Metadata.ThumbnailMetadata thumbnailMetadata)
{
    System.Console.WriteLine("EXIF thumbnail:");

    // print info about EXIF thumbnail
    System.Console.WriteLine(string.Format("  Thumbnail size: {0}", thumbnailMetadata.ThumbnailSize));

    System.Console.WriteLine();
}

private void PrintExifTagCollectionInfo(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection tags, string indent)
{
    // print tag count
    System.Console.WriteLine(string.Format("{0}Tags [{1}]:", indent, tags.Count));
    // for each tag
    for (int i = 0; i < tags.Count; i++)
    {
        // print tag info
        System.Console.WriteLine(string.Format("{0}- Id={1}, Name={2}, Data={3}", indent, tags[i].Id, tags[i].Name, tags[i].Data));
        
        // if tag data is TiffImageFileDirectory
        if (tags[i].Data.GetType() == typeof(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory))
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory subIfd = 
                (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)tags[i].Data;
            // print info about tag collection of sub IFD
            PrintExifTagCollectionInfo(subIfd.Tags, indent + "  ");
        }
        // if tag data is TiffImageFileDirectory[]
        if (tags[i].Data.GetType() == typeof(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[]))
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[] subIfds = 
                (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[])tags[i].Data;
            for (int j = 0; j < subIfds.Length; j++)
                // print info about tag collection of sub IFD
                PrintExifTagCollectionInfo(subIfds[j].Tags, indent + "  ");
        }
    }
}

Public Sub PrintExifInfoAboutJpegFile(filename As String)
    ' create an instance of VintasoftImage class
    Using jpegImage As New Vintasoft.Imaging.VintasoftImage(filename)
        ' get reference to a metadata tree of JPEG page
        Dim jpegPageMetadata As Vintasoft.Imaging.Metadata.MetadataNode = jpegImage.Metadata.MetadataTree
        ' search for tree node that contains information about JPEG thumbnail
        Dim jpegApp1ExifSegmentMetadata As Vintasoft.Imaging.Metadata.JpegApp1ExifSegmentMetadata = jpegPageMetadata.FindChildNode(Of Vintasoft.Imaging.Metadata.JpegApp1ExifSegmentMetadata)()
        ' if tree node that contains EXIF information is found
        If jpegApp1ExifSegmentMetadata IsNot Nothing Then
            ' if EXIF data is found
            If jpegApp1ExifSegmentMetadata.IFD0 IsNot Nothing Then
                ' print info about EXIF data
                PrintInfoAboutExifData(jpegApp1ExifSegmentMetadata.IFD0)
            End If

            ' if EXIF thumbnail data is found
            If jpegApp1ExifSegmentMetadata.IFD1 IsNot Nothing Then
                ' print info about EXIF thumbnail data
                PrintInfoAboutExifThumbnailData(jpegApp1ExifSegmentMetadata.IFD1)
            End If

            ' if EXIF thumbnail is found
            If jpegApp1ExifSegmentMetadata.Thumbnail IsNot Nothing Then
                ' print info about EXIF thumbnail
                PrintInfoAboutExifThumbnail(jpegApp1ExifSegmentMetadata.Thumbnail)
            End If
        End If
    End Using
End Sub

Private Sub PrintInfoAboutExifData(jpegApp1Ifd0Metadata As Vintasoft.Imaging.Metadata.JpegApp1Ifd0Metadata)
    System.Console.WriteLine("EXIF data:")

    ' print info about tag collection of EXIF data
    PrintExifTagCollectionInfo(jpegApp1Ifd0Metadata.ImageFileDirectory.Tags, "  ")

    System.Console.WriteLine()
End Sub

Private Sub PrintInfoAboutExifThumbnailData(jpegApp1Ifd1Metadata As Vintasoft.Imaging.Metadata.JpegApp1Ifd1Metadata)
    System.Console.WriteLine("EXIF thumbnail data:")

    ' print info about tag collection of EXIF thumbnail data
    PrintExifTagCollectionInfo(jpegApp1Ifd1Metadata.ImageFileDirectory.Tags, "  ")

    System.Console.WriteLine()
End Sub

Private Sub PrintInfoAboutExifThumbnail(thumbnailMetadata As Vintasoft.Imaging.Metadata.ThumbnailMetadata)
    System.Console.WriteLine("EXIF thumbnail:")

    ' print info about EXIF thumbnail
    System.Console.WriteLine(String.Format("  Thumbnail size: {0}", thumbnailMetadata.ThumbnailSize))

    System.Console.WriteLine()
End Sub

Private Sub PrintExifTagCollectionInfo(tags As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection, indent As String)
    ' print tag count
    System.Console.WriteLine(String.Format("{0}Tags [{1}]:", indent, tags.Count))
    ' for each tag
    For i As Integer = 0 To tags.Count - 1
        ' print tag info
        System.Console.WriteLine(String.Format("{0}- Id={1}, Name={2}, Data={3}", indent, tags(i).Id, tags(i).Name, tags(i).Data))

        ' if tag data is TiffImageFileDirectory
        If tags(i).Data.[GetType]() Is GetType(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory) Then
            Dim subIfd As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory = DirectCast(tags(i).Data, Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)
            ' print info about tag collection of sub IFD
            PrintExifTagCollectionInfo(subIfd.Tags, indent & "  ")
        End If
        ' if tag data is TiffImageFileDirectory[]
        If tags(i).Data.[GetType]() Is GetType(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory()) Then
            Dim subIfds As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory() = DirectCast(tags(i).Data, Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory())
            For j As Integer = 0 To subIfds.Length - 1
                ' print info about tag collection of sub IFD
                PrintExifTagCollectionInfo(subIfds(j).Tags, indent & "  ")
            Next
        End If
    Next
End Sub


Вот C#/VB.NET код, который демонстрирует, как изменить GPS информацию в JPEG файле: 
public void ChangeGpsInfoAboutJpegFile(string filename)
{
    // open a file stream in read-write mode
    using (System.IO.FileStream fs = new System.IO.FileStream(
        filename, System.IO.FileMode.Open, System.IO.FileAccess.ReadWrite))
    {
        // create an instance of VintasoftImage class
        using (Vintasoft.Imaging.VintasoftImage jpegImage = new Vintasoft.Imaging.VintasoftImage(fs))
        {
            // get reference to a metadata tree of JPEG page
            Vintasoft.Imaging.Metadata.MetadataNode jpegPageMetadata = jpegImage.Metadata.MetadataTree;
            // search for tree node that contains information about JPEG thumbnail
            Vintasoft.Imaging.Metadata.JpegApp1ExifSegmentMetadata jpegApp1ExifSegmentMetadata = 
                jpegPageMetadata.FindChildNode<Vintasoft.Imaging.Metadata.JpegApp1ExifSegmentMetadata>();
            // if tree node that contains information about JPEG thumbnail is found
            if (jpegApp1ExifSegmentMetadata != null)
            {
                // if EXIF data is found
                if (jpegApp1ExifSegmentMetadata.IFD0 != null)
                {
                    // if GPS info is not found
                    if (jpegApp1ExifSegmentMetadata.IFD0.GpsIFD == null)
                        // create node that contains GPS info
                        jpegApp1ExifSegmentMetadata.IFD0.CreateGpsIFD();

                    // get reference to a GPS IFD
                    Vintasoft.Imaging.Metadata.TiffIfdMetadata gpsIfd = jpegApp1ExifSegmentMetadata.IFD0.GpsIFD;

                    // search for tag that contains info about GPS date stamp
                    Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTag gpsDateStampTag = 
                        gpsIfd.ImageFileDirectory.Tags.Find((ushort)Vintasoft.Imaging.Codecs.ImageFiles.Tiff.ExifGpsTagId.GPSDateStamp);
                    // if tag that contains info about GPS date stamp is found
                    if (gpsDateStampTag != null)
                        // change the tag data
                        gpsDateStampTag.Data = System.DateTime.Now.ToString();
                    // if tag that contains info about GPS date stamp is not found
                    else
                        // add the GPS date stamp
                        gpsIfd.ImageFileDirectory.Tags.Add(
                            (ushort)Vintasoft.Imaging.Codecs.ImageFiles.Tiff.ExifGpsTagId.GPSDateStamp, 
                            System.DateTime.Now.ToString());

                    // create an encoder for image saving
                    Vintasoft.Imaging.Codecs.Encoders.JpegEncoder encoder = new Vintasoft.Imaging.Codecs.Encoders.JpegEncoder();
                    encoder.SaveAndSwitchSource = true;
                    // save changes to the source stream
                    jpegImage.Save(fs, encoder);
                }
            }
        }
    }
}

Public Sub ChangeGpsInfoAboutJpegFile(filename As String)
    ' open a file stream in read-write mode
    Using fs As New System.IO.FileStream(filename, System.IO.FileMode.Open, System.IO.FileAccess.ReadWrite)
        ' create an instance of VintasoftImage class
        Using jpegImage As New Vintasoft.Imaging.VintasoftImage(fs)
            ' get reference to a metadata tree of JPEG page
            Dim jpegPageMetadata As Vintasoft.Imaging.Metadata.MetadataNode = jpegImage.Metadata.MetadataTree
            ' search for tree node that contains information about JPEG thumbnail
            Dim jpegApp1ExifSegmentMetadata As Vintasoft.Imaging.Metadata.JpegApp1ExifSegmentMetadata = jpegPageMetadata.FindChildNode(Of Vintasoft.Imaging.Metadata.JpegApp1ExifSegmentMetadata)()
            ' if tree node that contains information about JPEG thumbnail is found
            If jpegApp1ExifSegmentMetadata IsNot Nothing Then
                ' if EXIF data is found
                If jpegApp1ExifSegmentMetadata.IFD0 IsNot Nothing Then
                    ' if GPS info is not found
                    If jpegApp1ExifSegmentMetadata.IFD0.GpsIFD Is Nothing Then
                        ' create node that contains GPS info
                        jpegApp1ExifSegmentMetadata.IFD0.CreateGpsIFD()
                    End If

                    ' get reference to a GPS IFD
                    Dim gpsIfd As Vintasoft.Imaging.Metadata.TiffIfdMetadata = jpegApp1ExifSegmentMetadata.IFD0.GpsIFD

                    ' search for tag that contains info about GPS date stamp
                    Dim gpsDateStampTag As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTag = gpsIfd.ImageFileDirectory.Tags.Find(CUShort(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.ExifGpsTagId.GPSDateStamp))
                    ' if tag that contains info about GPS date stamp is found
                    If gpsDateStampTag IsNot Nothing Then
                        ' change the tag data
                        gpsDateStampTag.Data = System.DateTime.Now.ToString()
                    Else
                        ' if tag that contains info about GPS date stamp is not found
                        ' add the GPS date stamp
                        gpsIfd.ImageFileDirectory.Tags.Add(CUShort(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.ExifGpsTagId.GPSDateStamp), System.DateTime.Now.ToString())
                    End If

                    ' create an encoder for image saving
                    Dim encoder As New Vintasoft.Imaging.Codecs.Encoders.JpegEncoder()
                    encoder.SaveAndSwitchSource = True
                    ' save changes to the source stream
                    jpegImage.Save(fs, encoder)
                End If
            End If
        End Using
    End Using
End Sub


Вот C#/VB.NET код, который демонстрирует, как получить миниатюру из JPEG файла: 
public Vintasoft.Imaging.VintasoftImage GetJpegThumbnail(string filename)
{
    // create an instance of VintasoftImage class
    using (Vintasoft.Imaging.VintasoftImage jpegImage = 
        new Vintasoft.Imaging.VintasoftImage(filename))
    {
        // get reference to a metadata tree of JPEG page
        Vintasoft.Imaging.Metadata.MetadataNode jpegPageMetadata = jpegImage.Metadata.MetadataTree;
        // search for tree node that contains information about JPEG thumbnail
        Vintasoft.Imaging.Metadata.JpegApp1ThumbnailMetadata jpegThumbnailMetadata = 
            jpegPageMetadata.FindChildNode<Vintasoft.Imaging.Metadata.JpegApp1ThumbnailMetadata>();
        // if tree node that contains information about JPEG thumbnail is found
        if (jpegThumbnailMetadata != null)
            // return thumbnail of JPEG page
            return jpegThumbnailMetadata.ThumbnailImage;

        // JPEG page does not have thumbnail
        return null;
    }
}

Public Function GetJpegThumbnail(filename As String) As Vintasoft.Imaging.VintasoftImage
    ' create an instance of VintasoftImage class
    Using jpegImage As New Vintasoft.Imaging.VintasoftImage(filename)
        ' get reference to a metadata tree of JPEG page
        Dim jpegPageMetadata As Vintasoft.Imaging.Metadata.MetadataNode = jpegImage.Metadata.MetadataTree
        ' search for tree node that contains information about JPEG thumbnail
        Dim jpegThumbnailMetadata As Vintasoft.Imaging.Metadata.JpegApp1ThumbnailMetadata = jpegPageMetadata.FindChildNode(Of Vintasoft.Imaging.Metadata.JpegApp1ThumbnailMetadata)()
        ' if tree node that contains information about JPEG thumbnail is found
        If jpegThumbnailMetadata IsNot Nothing Then
            ' return thumbnail of JPEG page
            Return jpegThumbnailMetadata.ThumbnailImage
        End If

        ' JPEG page does not have thumbnail
        Return Nothing
    End Using
End Function


Доступ к метаданным экземпляра класса, который является производным от класса ImageFile

ImageFileBase<T> класс - абстрактный класс, обеспечивающий доступ к файлу изображения. Для каждого поддерживаемого формата файла изображения существует класс, производный от ImageFileBase<T> class, а именно:
Метаданные файла изображения можно получить, используя свойства и методы экземпляра класса, которые является производным от класса ImageFileBase<T> . Также экземпляр класса, производного от класса ImageFileBase<T> , обеспечивает доступ к страницам файла.

Вот C#/VB.NET код, который демонстрирует, как получить формат и версию TIFF файла: 
public void PrintInfoAboutTiffFileFormatAndVersion(string filename)
{
    // create an instance of TiffFile class
    using (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile tiffFile = 
        new Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile(filename))
    {
        System.Console.WriteLine(string.Format("TIFF Format={0} Version={1}", tiffFile.Format, tiffFile.Version));
    }
}

Public Sub PrintInfoAboutTiffFileFormatAndVersion(filename As String)
    ' create an instance of TiffFile class
    Using tiffFile As New Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile(filename)
        System.Console.WriteLine(String.Format("TIFF Format={0} Version={1}", tiffFile.Format, tiffFile.Version))
    End Using
End Sub


Класс ImagePage - это абстрактный класс, обеспечивающий доступ к странице изображения. Для каждого поддерживаемого формата файла изображения существует класс, производный от класса ImagePage, а именно:
Метаданные страницы изображения можно получить, используя свойства и методы экземпляра класса, производного от класса ImagePage.


Вот C#/VB.NET код, который демонстрирует, как получить информацию о тегах TIFF файла: 
public void PrintInfoAboutTiffFile(string filename)
{
    // create an instance of TiffFile class
    using (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile tiffFile = 
        new Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile(filename))
    {
        // for each TIFF page
        for (int i = 0; i < tiffFile.Pages.Count; i++)
        {
            System.Console.WriteLine(string.Format("Page {0}", i));

            // print info about TIFF IFD data
            PrintInfoAboutTiffIfdData(tiffFile.Pages[0].IFD);
        }
    }
}

private void PrintInfoAboutTiffIfdData(
    Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory ifd)
{
    System.Console.WriteLine("  TIFF IFD data:");

    // print info about tag collection of EXIF data
    PrintTiffTagCollectionInfo(ifd.Tags, "    ");

    System.Console.WriteLine();
}

private void PrintTiffTagCollectionInfo(
    Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection tags, string indent)
{
    // print tag count
    System.Console.WriteLine(string.Format("{0}Tags [{1}]:", indent, tags.Count));
    // for each tag
    for (int i = 0; i < tags.Count; i++)
    {
        // print tag info
        System.Console.WriteLine(string.Format("{0}- Id={1}, Name={2}, Data={3}", indent, tags[i].Id, tags[i].Name, tags[i].Data));

        // if tag data is TiffImageFileDirectory
        if (tags[i].Data.GetType() == typeof(
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory))
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory subIfd = 
                (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)tags[i].Data;
            // print info about tag collection of sub IFD
            PrintTiffTagCollectionInfo(subIfd.Tags, indent + "  ");
        }
        // if tag data is TiffImageFileDirectory[]
        if (tags[i].Data.GetType() == typeof(
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[]))
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[] subIfds = 
                (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[])tags[i].Data;
            for (int j = 0; j < subIfds.Length; j++)
                // print info about tag collection of sub IFD
                PrintTiffTagCollectionInfo(subIfds[j].Tags, indent + "  ");
        }
    }
}

Public Sub PrintInfoAboutTiffFile(filename As String)
    ' create an instance of TiffFile class
    Using tiffFile As New Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile(filename)
        ' for each TIFF page
        For i As Integer = 0 To tiffFile.Pages.Count - 1
            System.Console.WriteLine(String.Format("Page {0}", i))

            ' print info about TIFF IFD data
            PrintInfoAboutTiffIfdData(tiffFile.Pages(0).IFD)
        Next
    End Using
End Sub

Private Sub PrintInfoAboutTiffIfdData(ifd As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)
    System.Console.WriteLine("  TIFF IFD data:")

    ' print info about tag collection of EXIF data
    PrintTiffTagCollectionInfo(ifd.Tags, "    ")

    System.Console.WriteLine()
End Sub

Private Sub PrintTiffTagCollectionInfo(tags As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection, indent As String)
    ' print tag count
    System.Console.WriteLine(String.Format("{0}Tags [{1}]:", indent, tags.Count))
    ' for each tag
    For i As Integer = 0 To tags.Count - 1
        ' print tag info
        System.Console.WriteLine(String.Format("{0}- Id={1}, Name={2}, Data={3}", indent, tags(i).Id, tags(i).Name, tags(i).Data))

        ' if tag data is TiffImageFileDirectory
        If tags(i).Data.[GetType]() Is GetType(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory) Then
            Dim subIfd As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory = DirectCast(tags(i).Data, Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)
            ' print info about tag collection of sub IFD
            PrintTiffTagCollectionInfo(subIfd.Tags, indent & "  ")
        End If
        ' if tag data is TiffImageFileDirectory[]
        If tags(i).Data.[GetType]() Is GetType(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory()) Then
            Dim subIfds As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory() = DirectCast(tags(i).Data, Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory())
            For j As Integer = 0 To subIfds.Length - 1
                ' print info about tag collection of sub IFD
                PrintTiffTagCollectionInfo(subIfds(j).Tags, indent & "  ")
            Next
        End If
    Next
End Sub


Вот C#/VB.NET код, который демонстрирует, как получить EXIF информация из JPEG файле: 
public void PrintExifInfoAboutJpegFile(string filename)
{
    // create an instance of JpegFile class
    using (Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.JpegFile jpegFile = 
        new Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.JpegFile(filename))
    {
        // if JPEG page contains EXIF information
        if (jpegFile.Page.Exif != null)
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.ExifData exifData = jpegFile.Page.Exif;

            // if EXIF data is found
            if (exifData.ImageFileDirectory != null)
                // print info about EXIF data
                PrintInfoAboutExifData(exifData.ImageFileDirectory);

            // if EXIF thumbnail data is found
            if (exifData.ThumbnailFileDirectory != null)
                // print info about EXIF thumbnail data
                PrintInfoAboutExifThumbnailData(exifData.ThumbnailFileDirectory);

            // if EXIF thumbnail is found
            if (exifData.HasThumbnail)
                // print info about EXIF thumbnail
                PrintInfoAboutExifThumbnail(exifData);
        }
    }
}

private void PrintInfoAboutExifData(
    Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory exifDataIfd)
{
    System.Console.WriteLine("EXIF data:");

    // print info about tag collection of EXIF data
    PrintExifTagCollectionInfo(exifDataIfd.Tags, "  ");

    System.Console.WriteLine();
}

private void PrintInfoAboutExifThumbnailData(
    Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory exifThumbnailDataIfd)
{
    System.Console.WriteLine("EXIF thumbnail data:");

    // print info about tag collection of EXIF thumbnail data
    PrintExifTagCollectionInfo(exifThumbnailDataIfd.Tags, "  ");

    System.Console.WriteLine();
}

private void PrintInfoAboutExifThumbnail(
    Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.ExifData exifData)
{
    System.Console.WriteLine("EXIF thumbnail:");

    using (Vintasoft.Imaging.VintasoftImage thumbnailImage = exifData.GetThumbnail())
    {
        // print info about EXIF thumbnail
        System.Console.WriteLine(string.Format("  Thumbnail size: {0}x{1}", thumbnailImage.Width, thumbnailImage.Height));
    }

    System.Console.WriteLine();
}

private void PrintExifTagCollectionInfo(
    Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection tags, string indent)
{
    // print tag count
    System.Console.WriteLine(string.Format("{0}Tags [{1}]:", indent, tags.Count));
    // for each tag
    for (int i = 0; i < tags.Count; i++)
    {
        // print tag info
        System.Console.WriteLine(string.Format("{0}- Id={1}, Name={2}, Data={3}", indent, tags[i].Id, tags[i].Name, tags[i].Data));
        
        // if tag data is TiffImageFileDirectory
        if (tags[i].Data.GetType() == typeof(
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory))
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory subIfd = 
                (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)tags[i].Data;
            // print info about tag collection of sub IFD
            PrintExifTagCollectionInfo(subIfd.Tags, indent + "  ");
        }
        // if tag data is TiffImageFileDirectory[]
        if (tags[i].Data.GetType() == typeof(
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[]))
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[] subIfds = 
                (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory[])tags[i].Data;
            for (int j = 0; j < subIfds.Length; j++)
                // print info about tag collection of sub IFD
                PrintExifTagCollectionInfo(subIfds[j].Tags, indent + "  ");
        }
    }
}

Public Sub PrintExifInfoAboutJpegFile(filename As String)
    ' create an instance of JpegFile class
    Using jpegFile As New Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.JpegFile(filename)
        ' if JPEG page contains EXIF information
        If jpegFile.Page.Exif IsNot Nothing Then
            Dim exifData As Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.ExifData = jpegFile.Page.Exif

            ' if EXIF data is found
            If exifData.ImageFileDirectory IsNot Nothing Then
                ' print info about EXIF data
                PrintInfoAboutExifData(exifData.ImageFileDirectory)
            End If

            ' if EXIF thumbnail data is found
            If exifData.ThumbnailFileDirectory IsNot Nothing Then
                ' print info about EXIF thumbnail data
                PrintInfoAboutExifThumbnailData(exifData.ThumbnailFileDirectory)
            End If

            ' if EXIF thumbnail is found
            If exifData.HasThumbnail Then
                ' print info about EXIF thumbnail
                PrintInfoAboutExifThumbnail(exifData)
            End If
        End If
    End Using
End Sub

Private Sub PrintInfoAboutExifData(exifDataIfd As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)
    System.Console.WriteLine("EXIF data:")

    ' print info about tag collection of EXIF data
    PrintExifTagCollectionInfo(exifDataIfd.Tags, "  ")

    System.Console.WriteLine()
End Sub

Private Sub PrintInfoAboutExifThumbnailData(exifThumbnailDataIfd As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)
    System.Console.WriteLine("EXIF thumbnail data:")

    ' print info about tag collection of EXIF thumbnail data
    PrintExifTagCollectionInfo(exifThumbnailDataIfd.Tags, "  ")

    System.Console.WriteLine()
End Sub

Private Sub PrintInfoAboutExifThumbnail(exifData As Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.ExifData)
    System.Console.WriteLine("EXIF thumbnail:")

    Using thumbnailImage As Vintasoft.Imaging.VintasoftImage = exifData.GetThumbnail()
        ' print info about EXIF thumbnail
        System.Console.WriteLine(String.Format("  Thumbnail size: {0}x{1}", thumbnailImage.Width, thumbnailImage.Height))
    End Using

    System.Console.WriteLine()
End Sub

Private Sub PrintExifTagCollectionInfo(tags As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection, indent As String)
    ' print tag count
    System.Console.WriteLine(String.Format("{0}Tags [{1}]:", indent, tags.Count))
    ' for each tag
    For i As Integer = 0 To tags.Count - 1
        ' print tag info
        System.Console.WriteLine(String.Format("{0}- Id={1}, Name={2}, Data={3}", indent, tags(i).Id, tags(i).Name, tags(i).Data))

        ' if tag data is TiffImageFileDirectory
        If tags(i).Data.[GetType]() Is GetType(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory) Then
            Dim subIfd As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory = DirectCast(tags(i).Data, Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory)
            ' print info about tag collection of sub IFD
            PrintExifTagCollectionInfo(subIfd.Tags, indent & "  ")
        End If
        ' if tag data is TiffImageFileDirectory[]
        If tags(i).Data.[GetType]() Is GetType(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory()) Then
            Dim subIfds As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory() = DirectCast(tags(i).Data, Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffImageFileDirectory())
            For j As Integer = 0 To subIfds.Length - 1
                ' print info about tag collection of sub IFD
                PrintExifTagCollectionInfo(subIfds(j).Tags, indent & "  ")
            Next
        End If
    Next
End Sub


Вот C#/VB.NET код, который демонстрирует, как изменить GPS информацию в JPEG файле: 
public void ChangeGpsInfoAboutJpegFile(string filename)
{
    // create an instance of JpegFile class
    using (Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.JpegFile jpegFile = 
        new Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.JpegFile(filename))
    {
        // if JPEG page contains EXIF information
        if (jpegFile.Page.Exif != null)
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.ExifData exifData = jpegFile.Page.Exif;

            // if EXIF data is found
            if (exifData.ImageFileDirectory != null)
            {
                // if GPS info is not found
                if (exifData.ImageFileDirectory.GpsTags == null)
                    // create tag collection that contains GPS info
                    exifData.ImageFileDirectory.GpsTags = 
                        new Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection();

                // get reference to a GPS tags
                Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection gpsTags = 
                    exifData.ImageFileDirectory.GpsTags;

                // search for tag that contains info about GPS date stamp
                Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTag gpsDateStampTag = 
                    gpsTags.Find((ushort)Vintasoft.Imaging.Codecs.ImageFiles.Tiff.ExifGpsTagId.GPSDateStamp);
                // if tag that contains info about GPS date stamp is found
                if (gpsDateStampTag != null)
                    // change the tag data
                    gpsDateStampTag.Data = System.DateTime.Now.ToString();
                // if tag that contains info about GPS date stamp is not found
                else
                    // add the GPS date stamp
                    gpsTags.Add((ushort)Vintasoft.Imaging.Codecs.ImageFiles.Tiff.ExifGpsTagId.GPSDateStamp, 
                        System.DateTime.Now.ToString());

                // save changes to the source file
                jpegFile.SaveChanges();
            }
        }
    }
}

Public Sub ChangeGpsInfoAboutJpegFile(filename As String)
    ' create an instance of JpegFile class
    Using jpegFile As New Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.JpegFile(filename)
        ' if JPEG page contains EXIF information
        If jpegFile.Page.Exif IsNot Nothing Then
            Dim exifData As Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.ExifData = jpegFile.Page.Exif

            ' if EXIF data is found
            If exifData.ImageFileDirectory IsNot Nothing Then
                ' if GPS info is not found
                If exifData.ImageFileDirectory.GpsTags Is Nothing Then
                    ' create tag collection that contains GPS info
                    exifData.ImageFileDirectory.GpsTags = New Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection()
                End If

                ' get reference to a GPS tags
                Dim gpsTags As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTagCollection = exifData.ImageFileDirectory.GpsTags

                ' search for tag that contains info about GPS date stamp
                Dim gpsDateStampTag As Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffTag = gpsTags.Find(CUShort(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.ExifGpsTagId.GPSDateStamp))
                ' if tag that contains info about GPS date stamp is found
                If gpsDateStampTag IsNot Nothing Then
                    ' change the tag data
                    gpsDateStampTag.Data = System.DateTime.Now.ToString()
                Else
                    ' if tag that contains info about GPS date stamp is not found
                    ' add the GPS date stamp
                    gpsTags.Add(CUShort(Vintasoft.Imaging.Codecs.ImageFiles.Tiff.ExifGpsTagId.GPSDateStamp), System.DateTime.Now.ToString())
                End If

                ' save changes to the source file
                jpegFile.SaveChanges()
            End If
        End If
    End Using
End Sub


Вот C#/VB.NET код, который демонстрирует, как получить миниатюру из JPEG файла: 
public Vintasoft.Imaging.VintasoftImage GetJpegThumbnail(string filename)
{
    // create an instance of JpegFile class
    using (Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.JpegFile jpegFile = 
        new Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.JpegFile(filename))
    {
        // if JPEG page contains EXIF information
        if (jpegFile.Page.Exif != null)
        {
            Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.ExifData exifData = jpegFile.Page.Exif;

            // if EXIF thumbnail is found
            if (exifData.HasThumbnail)
                // return thumbnail of JPEG page
                return exifData.GetThumbnail();
        }

        // JPEG page does not have thumbnail
        return null;
    }
}

Public Function GetJpegThumbnail(filename As String) As Vintasoft.Imaging.VintasoftImage
    ' create an instance of JpegFile class
    Using jpegFile As New Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.JpegFile(filename)
        ' if JPEG page contains EXIF information
        If jpegFile.Page.Exif IsNot Nothing Then
            Dim exifData As Vintasoft.Imaging.Codecs.ImageFiles.Jpeg.ExifData = jpegFile.Page.Exif

            ' if EXIF thumbnail is found
            If exifData.HasThumbnail Then
                ' return thumbnail of JPEG page
                Return exifData.GetThumbnail()
            End If
        End If

        ' JPEG page does not have thumbnail
        Return Nothing
    End Using
End Function


Доступ к метаданным объекта PdfDocument.

Класс PdfDocument обеспечивает доступ к PDF документу. Метаданные PDF документа можно получить, используя свойства и методы объекта PdfDocument. Также объект PdfDocument обеспечивает доступ к страницам PDF файла.

Вот C#/VB.NET код, который демонстрирует, как получить информацию о PDF документе: 
public void GetPdfDocumentInfo(string filename)
{
    // create an instance of PdfDocument class
    using (Vintasoft.Imaging.Pdf.PdfDocument pdfDocument = 
        new Vintasoft.Imaging.Pdf.PdfDocument(filename))
    {
        System.Console.WriteLine(string.Format("PDF document: '{0}'", filename));

        Vintasoft.Imaging.Pdf.Tree.PdfDocumentInformation documentInformation = pdfDocument.DocumentInformation;
        System.Console.WriteLine(string.Format("  Creator: {0}", documentInformation.Creator));
        System.Console.WriteLine(string.Format("  Producer: {0}", documentInformation.Producer));
        System.Console.WriteLine(string.Format("  Creation date: {0}", documentInformation.CreationDate));
        System.Console.WriteLine(string.Format("  Last modification date: {0}", documentInformation.ModifyDate));
        System.Console.WriteLine(string.Format("  Author: {0}", documentInformation.Author));
        System.Console.WriteLine(string.Format("  Title: {0}", documentInformation.Title));
        System.Console.WriteLine(string.Format("  Subject: {0}", documentInformation.Subject));
        System.Console.WriteLine(string.Format("  Keywords: {0}", documentInformation.Keywords));
    }
}

Public Sub GetPdfDocumentInfo(filename As String)
    ' create an instance of PdfDocument class
    Using pdfDocument As New Vintasoft.Imaging.Pdf.PdfDocument(filename)
        System.Console.WriteLine(String.Format("PDF document: '{0}'", filename))

        Dim documentInformation As Vintasoft.Imaging.Pdf.Tree.PdfDocumentInformation = pdfDocument.DocumentInformation
        System.Console.WriteLine(String.Format("  Creator: {0}", documentInformation.Creator))
        System.Console.WriteLine(String.Format("  Producer: {0}", documentInformation.Producer))
        System.Console.WriteLine(String.Format("  Creation date: {0}", documentInformation.CreationDate))
        System.Console.WriteLine(String.Format("  Last modification date: {0}", documentInformation.ModifyDate))
        System.Console.WriteLine(String.Format("  Author: {0}", documentInformation.Author))
        System.Console.WriteLine(String.Format("  Title: {0}", documentInformation.Title))
        System.Console.WriteLine(String.Format("  Subject: {0}", documentInformation.Subject))
        System.Console.WriteLine(String.Format("  Keywords: {0}", documentInformation.Keywords))
    End Using
End Sub


Класс PdfPage обеспечивает доступ к PDF странице документа. Метаданные PDF страницы можно получить, используя свойства и методы объекта PdfPage.


Вот C#/VB.NET код, который демонстрирует, как получить размер страницы PDF документа: 
public System.Drawing.SizeF GetFirstPdfPageSize(string filename)
{
    // create an instance of PdfDocument class
    using (Vintasoft.Imaging.Pdf.PdfDocument pdfDocument =
        new Vintasoft.Imaging.Pdf.PdfDocument(filename))
    {
        if (pdfDocument.Pages.Count == 0)
            return System.Drawing.SizeF.Empty;

        return pdfDocument.Pages[0].Size;
    }
}

Public Function GetFirstPdfPageSize(filename As String) As System.Drawing.SizeF
    ' create an instance of PdfDocument class
    Using pdfDocument As New Vintasoft.Imaging.Pdf.PdfDocument(filename)
        If pdfDocument.Pages.Count = 0 Then
            Return System.Drawing.SizeF.Empty
        End If

        Return pdfDocument.Pages(0).Size
    End Using
End Function


Вот C#/VB.NET код, который демонстрирует, как получить миниатюру cтраницы PDF документа: 
public Vintasoft.Imaging.VintasoftImage GetFirstPdfPageThumbnail(string filename)
{
    // create an instance of PdfDocument class
    using (Vintasoft.Imaging.Pdf.PdfDocument pdfDocument = 
        new Vintasoft.Imaging.Pdf.PdfDocument(filename))
    {
        if (pdfDocument.Pages.Count == 0)
            return null;

        return pdfDocument.Pages[0].GetThumbnail(100, 100);
    }
}

Public Function GetFirstPdfPageThumbnail(filename As String) As Vintasoft.Imaging.VintasoftImage
    ' create an instance of PdfDocument class
    Using pdfDocument As New Vintasoft.Imaging.Pdf.PdfDocument(filename)
        If pdfDocument.Pages.Count = 0 Then
            Return Nothing
        End If

        Return pdfDocument.Pages(0).GetThumbnail(100, 100)
    End Using
End Function


 

 

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