Gets the total number of embedded files (attachments) in a PDF file.
public static int getEmbeddedFileCount(
java.lang.String,
java.lang.String
);
fileName
The name of the PDF file.
password
The password to use when loading this PDF file (if the file is encrypted); otherwise, use null.
The total number of embedded files (attachments) in the PDF.
This example will re-generate a PDF document by stitching the pages of original document, followed by all the attachments found.
using Leadtools.WinForms;
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Controls;
using Leadtools.Drawing;
using Leadtools.ImageProcessing;
using Leadtools.Pdf;
using Leadtools.Svg;
public static void ExtractAttachmentsAndStitch(string inputFileName, string outputFileName)
{
File.Delete(outputFileName);
// Get the number of embedded files (attachments) in the input file
int attachmentCount = PDFFile.GetEmbeddedFileCount(inputFileName, null);
// If the file does not have any attachments we are done
if (attachmentCount == 0)
{
File.Copy(inputFileName, outputFileName, true);
return;
}
// To convert attachment files that are not PDF
var rasterCodecs = new RasterCodecs();
rasterCodecs.ThrowExceptionsOnInvalidImages = false;
var tempFiles = new List<string>();
// Now, extract all the attachments
for (int attachmentNumber = 1; attachmentNumber <= attachmentCount; attachmentNumber++)
{
// Extract this attachment to a temporary file
string tempFile = Path.GetTempFileName();
PDFFile.ExtractEmbeddedFile(inputFileName, null, attachmentNumber, tempFile);
// If attachment is not PDF, convert it
RasterImageFormat format;
int pageCount;
using (CodecsImageInfo info = rasterCodecs.GetInformation(tempFile, true))
{
format = info.Format;
pageCount = info.TotalPages;
}
if (format == RasterImageFormat.Unknown)
{
// We do not know what to do with this attachment, log and ignore it
Console.WriteLine("Could not convert attachment file to PDF, ignoring");
File.Delete(tempFile);
}
else if (format != RasterImageFormat.RasPdf)
{
// Simple conversion using RasterImage.
// TODO for the Example: A better way is to use the DocumentConverter to get true document conversion with all the
// options available
string tempPdfFile = Path.GetTempFileName();
for (int pageNumber = 1; pageNumber <= pageCount; pageNumber++)
{
using (RasterImage image = rasterCodecs.Load(tempFile, pageNumber))
{
rasterCodecs.Save(image, tempPdfFile, RasterImageFormat.RasPdfJpeg422, 0, 1, -1, -1, CodecsSavePageMode.Append);
}
}
File.Copy(tempPdfFile, tempFile, true);
File.Delete(tempPdfFile);
tempFiles.Add(tempFile);
}
else
{
// TODO for the Example: Check if this file is PDF with attachments and call the function recursively.
tempFiles.Add(tempFile);
}
}
// Time to generate the final document, first the pages from the original document
// Did we extract/convert any attachments?
if (tempFiles.Count > 0)
{
// Note that if the original document is PDF portfolio, then it does not contain real pages. Just a placeholder that should be ignored
if (!PDFFile.IsPortfolio(inputFileName, null))
{
PDFFile file = new PDFFile(inputFileName);
file.MergeWith(tempFiles.ToArray(), outputFileName);
}
else
{
// This is portfolio, so we will ignore the original file and just merge the attachments
string firstFile = tempFiles[0];
tempFiles.RemoveAt(0);
PDFFile file = new PDFFile(firstFile);
file.MergeWith(tempFiles.ToArray(), outputFileName);
File.Delete(firstFile);
}
}
else
{
// No, just copy the original file over
File.Copy(inputFileName, outputFileName, true);
}
// Clean up
foreach (string tempFile in tempFiles)
File.Delete(tempFile);
rasterCodecs.Dispose();
}
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