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Image is not imported/exported from PDF file

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PdfProcessing
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Maurício
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Maurício asked on 01 Feb 2016, 12:34 PM

Hello 

 The following method is supposed to import a PDF file and export it. It works as expected, except that the image is lost. 

private void Test1()
      {
          var provider = new PdfFormatProvider();
 
          var stream = File.OpenRead(@"C:\inputFile.pdf");
 
          var document = provider.Import(stream);
 
          using (var output = new FileStream(@"C:\outputFile.pdf", FileMode.OpenOrCreate))
          {
              provider.Export(document, output);
          }
      }

 

 You might say that the file is in bad format or something, but why would this work?

private void Test2()
    {
        var stream = new FileStream(@"C:\inputFile.pdf", FileMode.Open, FileAccess.Read);
 
        var source = new PdfDocumentSource(stream, FormatProviderSettings.ReadOnDemand);
 
        ViewModel.DocumentSource = source;
    }

DocumentSource is binded to the PdfViewer.DocumentSource.

 

Here is the link to the PDF inputFile: https://goo.gl/3lpe9O

 Thank you

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Tanya
Telerik team
answered on 04 Feb 2016, 09:23 AM
Hi MaurĂ­cio,

The PdfFormatProvider class is shared between RadPdfProcessing and RadPdfViewer and it is important which of the provider's constructor overloads you are using. If I correctly understand, you are trying to use RadPdfViewer. The corresponding PdfFormatProvider could be created using the constructor that takes two parameters:
PdfFormatProvider provider = new PdfFormatProvider(stream, settings);

For more information on this topic, you could refer to the Showing a File article in our documentation.

However, RadPdfViewer is intended only to display PDF files and doesn't support exporting them.

Hope this is helpful.

Regards,
Tanya
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Maurício
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answered on 04 Feb 2016, 10:17 AM

Hello Tanya!

 I think I wasn't clear

I will explain directly what I am trying to do:

I have two different PDF files in my hard drive. I want them to become a single RadFixedDocument so I can set it to the PdfViewer.DocumentSource.

Here's what I am doing:

    private static RadFixedDocument LoadDocument(string file)
       {
           var provider = new Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider();
           using (Stream stream = File.OpenRead(file))
           {
               return provider.Import(stream);
           }
       }
 
       private void LoadPdf()
       {
           var mainDocument = new RadFixedDocument();
 
           var document1 = LoadDocument(@"C:\inputFile.pdf");
 
           var document2 = LoadDocument(@"C:\inputFile1.pdf");
 
           foreach (var page in document1.Pages.ToList())
           {
               document1.Pages.Remove(page);
               mainDocument.Pages.Add(page);
           }
 
           foreach (var page in document2.Pages.ToList())
           {
               document2.Pages.Remove(page);
               mainDocument.Pages.Add(page);
           }
 
           pdfViewer.DocumentSource = GetPdfDocumentSource(mainDocument);
       }
 
private PdfDocumentSource GetPdfDocumentSource(RadFixedDocument document)
       {
           var formatProvider = new Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider
           {
               ExportSettings =
               {
                   ImageQuality = ImageQuality.High
               }
           };
 
           var pdfMemoryStream = new MemoryStream(formatProvider.Export(document));
 
           var pdfSource = new PdfDocumentSource(pdfMemoryStream, pdfViewer.DefaultFormatProviderSettings);
 
           pdfSource.Loaded += (sender, args) =>
           {
               if (pdfMemoryStream != null)
               {
                   pdfMemoryStream.Dispose();
                   pdfMemoryStream = null;
               }
           };
 
           return pdfSource;
       }

 

Here are the pdf files you can try to join (must be them because that's the point of the post, one of it doesn't show the image): https://goo.gl/Wjwk2i

 Thank you for your reply!!

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Tanya
Telerik team
answered on 08 Feb 2016, 05:34 PM
Hi MaurĂ­cio,

I was able to reproduce the behavior you are experiencing and it is caused by a missing feature in the RadPdfProcessing library. The image in question is actually preserved as a Form XObject. We have already logged such a request and you could track its progress through this public item. However, I am afraid that I cannot suggest you a suitable approach to work around this missing functionality.

Regards,
Tanya
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Vo
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answered on 08 Sep 2017, 10:28 AM

Hi,

i am using pdfviewer to show pdf content from url.

 

My problem is some content is not showed.

 

I tried open my pdf file in latest demo version and this error is still appeared. (attach file)

 

Can anybody help me?

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Tanya
Telerik team
answered on 12 Sep 2017, 02:56 PM
Hello,

I am afraid I cannot tell why the content is missing before testing the case. Is it possible to share a sample document so we can check what is causing you issues?

Regards,
Tanya
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Vo
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answered on 13 Sep 2017, 06:25 AM

my test case is very simple. I open a pdf by a edit pdf tool and insert some new content, then save it.

When i open edited file by pdfviewer (direct on telerik demo) --> pdf is showed but my new content is lost.

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Maurício
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answered on 13 Sep 2017, 06:55 PM
[quote]Vo said:

my test case is very simple. I open a pdf by a edit pdf tool and insert some new content, then save it.

When i open edited file by pdfviewer (direct on telerik demo) --> pdf is showed but my new content is lost.

[/quote]

I just did what you said and it worked fine.

I've created a new PDF using this online edit tool: http://www.pdfescape.com/open/

Then I drew a line, downloaded the file and opened with the PdfViewer from the demos.

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Tanya
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Maurício
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Vo
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