Questions on Telerik Document Processing Forum

1 answer

935 views

I noticed with 2017 R2, you just added Form Fields handling, thats great!

I reviewed another posting about iterating through images in a PDF. Can those images be extracted and replaced with another image?

Does the PDFProcessing library allow adding a watermark to existing PDF?

Thanks

Peter

PdfProcessing

answered on 19 Sep 2017

1 answer

1.0K+ views

Convert pdf to image

Hi

I use this code to convert pdf to List<image> but the resolution is not so high and the QR code inside the page is not detachable

Is there some way to improve the resolution (more DPI)?

public static List<ImageSource> ConvertPdfToImage(string filePath)

{

List<ImageSource> result = new List<ImageSource>();

ThumbnailFactory tf = new ThumbnailFactory();

using (Stream stream = File.Open(filePath, FileMode.Open))

{

PdfFormatProvider formatProvider = new PdfFormatProvider(stream, FormatProviderSettings.ReadAllAtOnce);

RadFixedDocument document = formatProvider.Import();

foreach (RadFixedPage page in document.Pages)

{

ImageSource pageImg = tf.CreateThumbnail(page, page.Size);

result.Add(pageImg);

}

return result;

}

Thank you

PdfProcessing

answered on 18 Sep 2017

6 answers

164 views

Latest online resources for Telerik Document Processing

The documentation for the libraries included in Telerik Document Processing is available at http://docs.telerik.com/devtools/document-processing.

This week's latest resources are described below.

RadPdfProcessing
TextFragment
The content of this article is updated to describe the new properties added to the TextFragment class.

RadSpreadProcessing
Headers and Footers
The article is introduced to describe the new feature in RadSpreadProcessing - applying headers and footers when printing a document or exporting to PDF.

RadSpreadStreamProcessing
RadSpreadStreamProcessing
A new help section that explains how you could use the new RadSpreadStreamProcessing library to achieve fast export of spreadsheet documents with minimal memory usage.

General Discussions

answered on 15 Sep 2017

1 answer

861 views

RadFlowDocument to PDF error?

Dear Telerik,

Currently I'm trying to export docx to pdf but got some errors.

Here is my export code:

PdfFormatProvider pdfer = new PdfFormatProvider();

using (Stream input = File.OpenRead("E:\\hd.docx"))
{
RadFlowDocument document = provider.Import(input);
pdfer.Export(document, new FileStream(@"E:\hd.pdf", FileMode.Create));
}

And I got this error: "cant convert RadFlowDocument to RadFixedDocument", also when I'm using RadDocument and IDocumentFormatProvider to export like some threads, visual studio couldn't found these class, interface.

My references at attachment file, please look at it.

Thank you very much for your help!

WordsProcessing

answered on 14 Sep 2017

4 answers

746 views

Insert a vector graphic or PDF as image

I create a barcode using the barcode library from DevExpress. It can export the barcode in various raster image formats (PNG, JPEG, ...), in vector graphic formats (WMF and EMF) or as a separate PDF file.

Currently I export a JPEG and add it to Telerik RadPdfProcessing using:

myBlock.InsertImage(new ImageSource(myJpegImageStream, ImageQuality.High));

Of course, the image quality is not optimal, because the raster graphics are lossy when zooming. Is there any way to insert a vector graphic or the PDF as described above in a RadPdfProcessing Block/FixedContentEditor? If RadPdfProcessing does not support WMF or EMF, but a different vector graphic format, which a WMF or EMF can be converted to, it would be OK for me to convert the WMF/EMF to this other format.

Using a PdfStreamWriter to manipulate the PDF created by RadPdfProcessing afterwards may be an option, but not a very nice one, because the image is not part of the document flow.

PdfProcessing

answered on 14 Sep 2017

7 answers

695 views

Image is not imported/exported from PDF file

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

PdfProcessing

answered on 13 Sep 2017

1 answer

180 views

PKWARE encryption only?

The documentation on this page (http://docs.telerik.com/devtools/document-processing/libraries/radziplibrary/features/protect-ziparchive) says
"RadZipLibrary supports traditional PKWARE encryption only. The settings for this encryption type are represented by the DefaultEncryptionSettingsclass."

PKware has shifted it's focus to providing encryption products, and now offers a multitude of different encryption methods, products, and supported algorithms.

Does anything know specifically what is meant by "traditional PKWARE encryption?" I'm hoping for something like AES-256 ?

ZipLibrary