PDFsharp & MigraDoc Foundation

PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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PostPosted: Tue Jun 30, 2020 11:46 pm 
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Hi all,

I have a Xamarin.Forms for Android and iOS, where I use PDFSharp.Xamarin.Forms to create a PDF-file and put some text on this with color. This file never gets saved on the phone, since it will only E-mail the file (with System.Net.Mail). This all works, but I have difficulties with the following:

I have an image (for Android in /Resources/drawable/image.jpg and for iOS in /Resources/image.jpg) which I want to add to the PDF-file. I Googled some examples, but nothing worked for me so far, since non of these examples are referring to the resources folder in Android and iOS.

Is it even possible to do this? If so, how?

Hope someone can help.


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PostPosted: Wed Jul 01, 2020 12:15 pm 
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Joined: Sat Mar 14, 2015 10:15 am
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AIUI the Xamarin version is a partial port of a partial port of the original PDFsharp.

With the original PDFsharp you can access embedded resources as `Stream` objects which you can use with `XImage` methods.

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Thomas
(Freelance Software Developer with several years of MigraDoc/PDFsharp experience)


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PostPosted: Wed Jul 01, 2020 1:54 pm 
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Joined: Tue Jun 30, 2020 11:39 pm
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Dear Thomas,

Do you have a code example for this?

Regards, Ganesh


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PostPosted: Wed Jul 01, 2020 2:32 pm 
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Look here:
https://stackoverflow.com/a/62646299/162529

You don't have to do the BASE64 encoding, just pass the Stream to the XImage class.

Just look how to use "GetManifestResourceStream(name)".

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Thomas
(Freelance Software Developer with several years of MigraDoc/PDFsharp experience)


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PostPosted: Fri Jul 03, 2020 4:03 pm 
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Joined: Tue Jun 30, 2020 11:39 pm
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Hi Thomas,

So I followed the solution given by you, but I do have an issue.

My code:
var assembly = Assembly.GetExecutingAssembly();
var name = "company.devision.current.Resources.image.jpg";

using (Stream stream = assembly.GetManifestResourceStream(name))
{
if (stream == null)
throw new ArgumentException("No resource with name " + name);

int count = (int)stream.Length;
byte[] data = new byte[count];
stream.Read(data, 0, count);

XImage im = XImage.FromStream(() => stream);
gfx.DrawImage(im, 0, 0, 250, 140);
}

I get the following error in the last line where I want to draw the image: System.NullReferenceException: 'Object reference not set to an instance of an object.'

gfx comes from 'XGraphics gfx = XGraphics.FromPdfPage(page);' and I use gfx through the entire code, so I don't think the problems is there.


Do you have any idea what might be wrong?

Regards, Ganesh


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