public static List <System.Drawing.Image> ExtractImagesFromPDF(String PDFSourcePath)
{
List <System.Drawing.Image> ImgList = new List <System.Drawing.Image>();
iTextSharp.text.pdf.RandomAccessFileOrArray RAFObj = null;
iTextSharp.text.pdf.PdfReader PDFReaderObj = null;
iTextSharp.text.pdf.PdfObject PDFObj = null;
iTextSharp.text.pdf.PdfStream PDFStremObj = null;
try
{
RAFObj = new iTextSharp.text.pdf.RandomAccessFileOrArray(PDFSourcePath);
PDFReaderObj = new iTextSharp.text.pdf.PdfReader(RAFObj, null);
for (int i = 0; i <= PDFReaderObj.XrefSize - 1; i++)
{
PDFObj = PDFReaderObj.GetPdfObject(i);
if ((PDFObj != null) && PDFObj.IsStream())
{
PDFStremObj = (iTextSharp.text.pdf.PdfStream)PDFObj;
iTextSharp.text.pdf.PdfObject subtype = PDFStremObj.Get(iTextSharp.text.pdf.PdfName.SUBTYPE);
if ((subtype != null) && subtype.ToString() == iTextSharp.text.pdf.PdfName.IMAGE.ToString())
{
try
{
iTextSharp.text.pdf.parser.PdfImageObject PdfImageObj =
new iTextSharp.text.pdf.parser.PdfImageObject((iTextSharp.text.pdf.PRStream)PDFStremObj);
System.Drawing.Image ImgPDF = PdfImageObj.GetDrawingImage();
ImgList.Add(ImgPDF);
}
catch (Exception)
{
}
}
}
}
PDFReaderObj.Close();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
return(ImgList);
}
private static IEnumerable <byte[]> GetImagesFromPdfPage(PdfReader pdf, int pageNumber)
{
var imagesBytes = new List <byte[]>();
var page = pdf.GetPageN(pageNumber);
var res = (PdfDictionary)PdfReader.GetPdfObject(page.Get(PdfName.RESOURCES));
var xobj = (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));
if (xobj == null)
{
return(null);
}
foreach (var name in xobj.Keys)
{
var obj = xobj.Get(name);
if (!obj.IsIndirect())
{
continue;
}
var tg = (PdfDictionary)PdfReader.GetPdfObject(obj);
var type = (PdfName)PdfReader.GetPdfObject(tg.Get(PdfName.SUBTYPE));
if (!type.Equals(PdfName.IMAGE))
{
continue;
}
var xrefIndex = ((PRIndirectReference)obj).Number;
var pdfImage = new iTextSharp.text.pdf.parser.PdfImageObject((PRStream)pdf.GetPdfObject(xrefIndex));
var img = pdfImage.GetDrawingImage();
var ms = new MemoryStream();
var myImageCodecInfo = GetEncoderInfo("image/jpeg");
var myEncoder = Encoder.Quality;
var myEncoderParameters = new EncoderParameters(1);
var myEncoderParameter = new EncoderParameter(myEncoder, 75L);
myEncoderParameters.Param[0] = myEncoderParameter;
img.Save(ms, myImageCodecInfo, myEncoderParameters);
// img.Save(ms, ImageFormat.Jpeg);
ms.Position = 0;
imagesBytes.Add(ms.ToArray());
}
return(imagesBytes);
}
public IList <System.Drawing.Image> GetImagesFromPdf(PdfDictionary dict, PdfReader doc)
{
List <System.Drawing.Image> images = new List <System.Drawing.Image>();
PdfDictionary res = (PdfDictionary)(PdfReader.GetPdfObject(dict.Get(PdfName.RESOURCES)));
PdfDictionary xobj = (PdfDictionary)(PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT)));
if (xobj != null)
{
foreach (PdfName name in xobj.Keys)
{
PdfObject obj = xobj.Get(name);
if (obj.IsIndirect())
{
PdfDictionary tg = (PdfDictionary)(PdfReader.GetPdfObject(obj));
PdfName subtype = (PdfName)(PdfReader.GetPdfObject(tg.Get(PdfName.SUBTYPE)));
if (PdfName.IMAGE.Equals(subtype))
{
int xrefIdx = ((PRIndirectReference)obj).Number;
PdfObject pdfObj = doc.GetPdfObject(xrefIdx);
PdfStream str = (PdfStream)(pdfObj);
iTextSharp.text.pdf.parser.PdfImageObject pdfImage =
new iTextSharp.text.pdf.parser.PdfImageObject((PRStream)str);
System.Drawing.Image img = pdfImage.GetDrawingImage();
images.Add(img);
}
else if (PdfName.FORM.Equals(subtype) || PdfName.GROUP.Equals(subtype))
{
images.AddRange(GetImagesFromPdf(tg, doc));
}
}
}
}
return(images);
}
public void SavePart(string srcFile, string dstFile, int startPage, int endPage)
{
PdfReader pdfReader = null;
try
{
Cursor.Current = Cursors.WaitCursor;
pdfReader = new PdfReader(srcFile);
pdfReader.RemoveUnusedObjects();
if (pdfReader.NumberOfPages == 0)
{
throw new Exception("В документе отсутствуют страницы. Операция сохранения невозможна!");
}
startPage = (startPage <= 0 || startPage > pdfReader.NumberOfPages) ? 1 : startPage;
endPage = (endPage <= 0 || endPage <startPage || endPage> pdfReader.NumberOfPages) ? pdfReader.NumberOfPages : endPage;
pdfReader.SelectPages(startPage.ToString() + "-" + endPage.ToString());
using (var file_stream = new FileStream(dstFile, FileMode.Create, FileAccess.Write, FileShare.None))
using (var stamper = new PdfStamper(pdfReader, file_stream))
{
stamper.SetFullCompression();
for (int numberPage = startPage; numberPage <= endPage; numberPage++)
{
if (numberPage <= 0 || numberPage > pdfReader.NumberOfPages)
{
continue;
}
PdfDictionary page = pdfReader.GetPageN(numberPage);
var resources = (PdfDictionary)PdfReader.GetPdfObject(page.Get(PdfName.RESOURCES));
var xobject = (PdfDictionary)PdfReader.GetPdfObject(resources.Get(PdfName.XOBJECT));
if (xobject != null)
{
foreach (PdfName pdname in xobject.Keys)
{
PdfObject obj = xobject.Get(pdname);
if (obj.IsIndirect())
{
var tg = (PdfDictionary)PdfReader.GetPdfObject(obj); //resolve indirect reference
var subType = (PdfName)PdfReader.GetPdfObject(tg.Get(PdfName.SUBTYPE));
if (PdfName.IMAGE.Equals(subType))
{
int xrefIndex = ((PRIndirectReference)obj).Number;
PdfObject imgPdfObj = pdfReader.GetPdfObject(xrefIndex);
var imgPdfStream = (PdfStream)imgPdfObj;
var imgPRStream = (PRStream)imgPdfStream;
byte[] bytes = PdfReader.GetStreamBytesRaw(imgPRStream);
if (bytes != null && bytes.Length > 0)
{
try
{
var pdfImage = new iTextSharp.text.pdf.parser.PdfImageObject(imgPRStream);
Image img = pdfImage.GetDrawingImage();
if (img != null)
{
var filter = (PdfName)pdfImage.Get(PdfName.FILTER);
if (filter != null)
{
continue;
}
System.Drawing.Imaging.ImageFormat format;
byte[] updatedImgBytes = Controls.PdfViewControl.PDFView.ConvertImageToBytes(img, 75, out format);
iTextSharp.text.Image compressedImage = iTextSharp.text.Image.GetInstance(updatedImgBytes);
if (format == System.Drawing.Imaging.ImageFormat.Png)
{
compressedImage.Deflated = true;
}
PdfReader.KillIndirect(obj);
stamper.Writer.AddDirectImageSimple(compressedImage, (PRIndirectReference)obj);
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
continue;
}
}
}
}
}
}
}
stamper.Close();
}
}
finally
{
if (pdfReader != null)
{
pdfReader.Close();
}
Cursor.Current = Cursors.Default;
}
}