How to open various document formats from memory in Xamarin Forms

[gustavo.santisteban]

I have documents in different encrypted formats. The decryption process of these I do in memory without saving a copy of the document on disk. What I need is to be able to display these documents directly from memory with PDFTron in Xamarin Forms. How can I achieve this?

I’ve tried to figure out how to work with the OpenNonPDFUri method but it needs an Android.Net.Uri and it’s not possible to get a byte array to it.

Any suggestion would be of great help. Thank you

[system]

Hello, I’m Ron, an automated tech support bot

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:

• Open MS Office documents and convert to PDF in Xamarin
• Display document in fragment in Xamarin - Prerequisites
• Web/HTML to PDF - Convert HTML to PDF in Xamarin.iOS
• Quick start

APIs:

• Namespace pdftron.PDF.Utils - IPTAnnotationModel
• Namespace pdftron.PDF.Controls - DocumentViewControllerShouldExportCachedDocumentAtURL
• Namespace pdftron.PDF.Tools - PTToolManagerObserver

Forums:

• How can I try annotations through PDFNet for Xamarin.Forms on UWP?
• How to get UIImage from PDFDraw on Xamarin?
• How to handle Tap events in Xamarin.iOS?

[emallon]

Hi,
It is possible to load a document from memory.
You will need to create a PDFDoc object using your byte array.
Once you create the PDFDoc object you can set the PDFDoc in your PDFViewCtrl

PDFDoc mPdfDoc = new PDFDoc(yourArray, arraySize);
mPdfViewCtrl.SetDoc(mPdfDoc);

Please let us know if this solution works for you.

[gustavo.santisteban]

Try this way you tell me. For PDF files it works fine but for files for example with the following extensions which are the ones I need (docx, xlsx, pptx, rtf, txt, jpg) it doesn’t work I get the following error:

“Message: PDF header not found. The file is not a valid PDF document.”

[Shirley_G]

Hi,

For non-pdf document, you’ll need to pre-convert it to a PDF:

PDFTron Systems Inc. | Documentation

Could you please give it a try?
Thanks.

[gustavo.santisteban]

I have tried the way you tell me. And if it lets me view MS Office documents, but other types of formats such as images (jpg, png, bmp or tif) or text files (txt) it does not display them, it gives me an error when converting.

Thank you for your answers

[ama]

Hi,

You can follow the following steps to convert images or txt files to PDF without saving to disk:

How to convert images to PDF in memory?

Question: I need to convert PNG, JPEG and TIFF images to PDF all in memory. No reading or writing to disk. Answer: The following C# code shows how to convert an image to a PDF all in memory, using this class. https://www.pdftron.com/api/PDFTronSDK/dotnet/pdftron.PDF.Convert.html#pdftron_PDF_Convert_StreamingPDFConversion_pdftron_Filters_Filter_pdftron_PDF_ConversionOptions_ PDFNet.Initialize(yourLicenseOrDemoKey); // At the beginning of your process PDFNet.SetDefaultDiskCachingEnabled(false…

Could you please give this a try?
Thanks.