Convert PDF File to Byte Array or Byte Array to PDF using C#

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You can read the details at: Convert PDF File to Byte Array or Byte Array to PDF using C#

ByteArraytoPDF.cs

// Load input file
string inputFile = dataDir + @"Test.PNG";

// Initialize byte array
byte[] buff = null;
FileStream fs = new FileStream(inputFile, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
long numBytes = new FileInfo(inputFile).Length;

// Load input image into Byte Array
buff = br.ReadBytes((int)numBytes);


Document doc = new Document();
// Add a page to pages collection of document
Page page = doc.Pages.Add();
// Load the source image file to Stream object
MemoryStream outstream = new MemoryStream();
MemoryStream mystream = new MemoryStream(buff);
// Instantiate BitMap object with loaded image stream
Bitmap b = new Bitmap(mystream);

// Set margins so image will fit, etc.
page.PageInfo.Margin.Bottom = 0;
page.PageInfo.Margin.Top = 0;
page.PageInfo.Margin.Left = 0;
page.PageInfo.Margin.Right = 0;

page.CropBox = new Aspose.Pdf.Rectangle(0, 0, b.Width, b.Height);
// Create an image object
Aspose.Pdf.Image image1 = new Aspose.Pdf.Image();
// Add the image into paragraphs collection of the section
page.Paragraphs.Add(image1);
// Set the image file stream
image1.ImageStream = mystream;

// Save resultant PDF file
doc.Save(outstream, SaveFormat.Pdf);
//doc.Save(dataDir + "outstream.pdf", SaveFormat.Pdf);

// Close memoryStream object
mystream.Close();

PDFtoByteArray.cs

dataDir = @"D:\Test\";

// Load input PDF file
string inputFile = dataDir + @"testpdf.pdf";

// Initialize a byte array
byte[] buff = null;

// Initialize FileStream object
FileStream fs = new FileStream(inputFile, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
long numBytes = new FileInfo(inputFile).Length;

// Load the file contents in the byte array
buff = br.ReadBytes((int) numBytes);
fs.Close();

// Work with the PDF file in byte array
ConvertPDFToJPEG(buff, 300, dataDir);


public static void ConvertPDFToJPEG(Byte[] PDFBlob, int resolution, string dataDir)
{
    // Open document
    using (MemoryStream InputStream = new MemoryStream(PDFBlob))
    {
        Aspose.Pdf.Document pdfDocument = new Aspose.Pdf.Document(InputStream);

        for (int pageCount = 1; pageCount <= pdfDocument.Pages.Count; pageCount++)
        {

            using (FileStream imageStream = new FileStream(dataDir + "image" + pageCount + "_out" + ".jpg", FileMode.Create))
            {
                // Create JPEG device with specified attributes
                // Width, Height, Resolution, Quality
                // Quality [0-100], 100 is Maximum
                // Create Resolution object

                Aspose.Pdf.Devices.Resolution res = new Aspose.Pdf.Devices.Resolution(resolution);
                // JpegDevice jpegDevice = new JpegDevice(500, 700, resolution, 100);

                // added the following to determine if landscape or not
                Int32 height, width = 0;

                PdfFileInfo info = new PdfFileInfo(pdfDocument);
                width = Convert.ToInt32(info.GetPageWidth(pdfDocument.Pages[pageCount].Number));
                height = Convert.ToInt32(info.GetPageHeight(pdfDocument.Pages[pageCount].Number));


                Aspose.Pdf.Devices.JpegDevice jpegDevice =
                //new Aspose.Pdf.Devices.JpegDevice(Aspose.Pdf.PageSize.A4, res, 100);
                new Aspose.Pdf.Devices.JpegDevice(width, height, res, 100);
                // Convert a particular page and save the image to stream

                //Aspose.Pdf.PageSize.A4.IsLandscape = true;
                jpegDevice.Process(pdfDocument.Pages[pageCount], imageStream);
                // Close stream
                imageStream.Close();
            }
        }
    }
}