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Need help on PDF split and merge

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tchuat asked on 23 Oct 2014, 03:59 AM

I am tryping to split pages from original pdf and save it as an individual pdf. No luck with the following code
Appreciate anyone can help. Thanks in advance.

Dim provider As New Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider

Using input As System.IO.Stream = System.IO.File.OpenRead("C:\WebSite2\pdf001.pdf")
Dim document As Telerik.Windows.Documents.Fixed.Model.RadFixedDocument = New Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider(input, FormatProviderSettings.ReadOnDemand).Import()

For i As Integer = 0 To document.Pages.Count - 1
Dim exportProvider As New Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider
Using out As System.IO.Stream = System.IO.File.OpenWrite("C:\WebSite2\Page" & i.ToString & ".pdf")

Dim outputDocument As New Telerik.Windows.Documents.Fixed.Model.RadFixedDocument
Dim page As RadFixedPage = New RadFixedPage()
page = document.Pages(i)

outputDocument.Pages.Add(page)
exportProvider.Export(outputDocument, out)
End Using
Next
End Using

Exception:
System.ArgumentException was unhandled by user code
HResult=-2147024809
Message=The document element is associated with another parent.
Parameter name: item
ParamName=item
Source=Telerik.Windows.Documents.Fixed

15 Answers, 1 is accepted

answered on 27 Oct 2014, 12:54 PM

Hello,

Thank you for contacting us.

There are a few changes I would suggest to the code snippet you have sent:

When importing a PDF file in PdfProcessing you should be using the constructor shown in this documentation article. You may find more detailed information about the difference in PdfFormatProvider's constructors in this link to Telerik's forums.
Before adding the RadFixedPage to the new RadFixedDocument instance you should first remove the page from the old document Pages collection. This way you will not get the exception that "The document element is associated with another parent.".

I hope this is helpful. If you have any other questions or concerns please do not hesitate to contact us again.

Regards,
Deyan
the Telerik team

answered on 28 Oct 2014, 02:55 AM

Thanks for your prompt reply.
I was first trying to use the sample code but the following code can't read the contain of the pdf, the caret position show object not reference to an object error.

Dim document As Telerik.Windows.Documents.Fixed.Model.RadFixedDocument = provider.Import(input)

So I change to the following code and it work

Dim document As Telerik.Windows.Documents.Fixed.Model.RadFixedDocument = New Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider(input, FormatProviderSettings.ReadOnDemand).Import()

After i remove the page from the original pdf and attach to the new output document, the new pdf generated show an empty page with This document was generated by a trial version of Telerik RadPdfProcessing.

Below is the modified code

Dim provider As New Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider

Using input As System.IO.Stream = System.IO.File.OpenRead("C:\WebSite2\082.pdf")

'Dim document As Telerik.Windows.Documents.Fixed.Model.RadFixedDocument = provider.Import(input)

Dim document As Telerik.Windows.Documents.Fixed.Model.RadFixedDocument = New Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider(input, FormatProviderSettings.ReadOnDemand).Import() 'provider.Import(input)

Dim j As Integer = 1

For i As Integer = 0 To document.Pages.Count - 1

If i = document.Pages.Count Then

Exit For

End If

Dim exportProvider As New Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider

Using out As System.IO.Stream = System.IO.File.OpenWrite("C:\WebSite2\Page" & j.ToString & ".pdf")

Dim outputDocument As New Telerik.Windows.Documents.Fixed.Model.RadFixedDocument

Dim page As RadFixedPage = document.Pages(i)

document.Pages.Remove(page)

outputDocument.Pages.Add(page)

exportProvider.Export(outputDocument, out)

i -= 1

j += 1

End Using

Next

End Using

answered on 28 Oct 2014, 02:42 PM

MergePdfFilesAspDemo.rar

Hello,

I am attaching a sample project that shows how to get the pages from two different PDF files and merge them into a single pdf. A few words about the project:

The project contains a singe WebForm with a button in it.
It also contains two PDF files - Ellipses.pdf and Rectangles.pdf.
When pressing the button the two files are imported with a PdfFormatProvider. The pages from the imported documents are added to a new RadFixedDocument instance. The new document is being exported and downloaded as MergedDocument.pdf.

As for the import errors that you have mentioned - they may be caused by the specific PDF document you are importing. Could you please send us the document you are importing so that we can further investigate the issue causing the exception?

I am looking forward to contacting you again.

Regards,
Deyan
the Telerik team

answered on 29 Oct 2014, 04:46 PM

Hello,

Thank you for sending us the sample document.

The received file uses features that are still not supported by RadPdfProcessing. As mentioned in this forum post currently RadPdfViewer and RadPdfProcessing share the same public API, but internally their models are still differing. This is the cause of the different behaviour when using different PdfFormatProvider constructors.

As PdfProcessing is under active development we are planning to unify both models soon, so that RadPdfProcessing supports all features supported by RadPdfViewer.

If you have any further questions do not hesitate to contact us again.

Regards,
Deyan
the Telerik team

Accepted