PDFsharp & MigraDoc Foundation

PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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PostPosted: Thu Sep 19, 2019 8:37 pm 
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Joined: Thu Sep 19, 2019 8:23 pm
Posts: 2
I have been trying to get migradocs to generate a pdf on an azure serverless function for a few days now, and I have been unable to get it to work. I first ran into an error stating that I needed to write my own MyFontResolver class, and following some code guides I have assembled the following:

Code:
public class MyFontResolver : IFontResolver
        {
            public FontResolverInfo ResolveTypeface(string familyName, bool isBold, bool isItalic)
            {
                // Ignore case of font names.
                var name = familyName.ToLower();

                // Deal with the fonts we know.
                switch (name)
                {
                    case "ubuntu":
                        if (isBold)
                        {
                            if (isItalic)
                                return new FontResolverInfo("Ubuntu#bi");
                            return new FontResolverInfo("Ubuntu#b");
                        }
                        if (isItalic)
                            return new FontResolverInfo("Ubuntu#i");
                        return new FontResolverInfo("Ubuntu#");

                    case "janitor":
                        return new FontResolverInfo("Janitor#");
                }

                // We pass all other font requests to the default handler.
                // When running on a web server without sufficient permission, you can return a default font at this stage.
                return PlatformFontResolver.ResolveTypeface(familyName, isBold, isItalic);
            }

            private byte[] LoadFontData(string name)
            {
                var assembly = Assembly.GetExecutingAssembly();

                // Test code to find the names of embedded fonts - put a watch on "ourResources"
                //var ourResources = assembly.GetManifestResourceNames();

                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);
                    return data;
                }
            }

            public byte[] GetFont(string faceName)
            {
                switch (faceName)
                {
                    case "Arial#":
                        return LoadFontData("MyProject.fonts.arial.arial.ttf"); ;

                    case "Arial#b":
                        return LoadFontData("MyProject.fonts.arial.arialbd.ttf"); ;

                    case "Arial#i":
                        return LoadFontData("MyProject.fonts.arial.ariali.ttf");

                    case "Arial#bi":
                        return LoadFontData("MyProject.fonts.arial.arialbi.ttf");
                }

                return null;
            }
        }


Since then, I have set GlobalFontSettings.FontResolver = new MyFontResolver(); and also paragraph.Format.Font.Name = "ubuntu"; where paragraph is a MigraDoc.DocumentObjectModel.Paragraph that holds the text. The error I am now getting is:

Code:
System.NullReferenceException: Object reference not set to an instance of an object.
   at PdfSharp.Fonts.OpenType.OpenTypeFontface.CetOrCreateFrom(XFontSource fontSource)
   at PdfSharp.Drawing.XGlyphTypeface.GetOrCreateFrom(String familyName, FontResolvingOptions fontResolvingOptions)
   at PdfSharp.Drawing.XFont.Initialize()
   at MigraDoc.Rendering.FontHandler.FontToXFont(Font font, PdfFontEncoding encoding)
   at MigraDoc.Rendering.ParagraphRenderer.get_CurrentFont()
   at MigraDoc.Rendering.ParagraphRenderer.InitFormat(Area area, FormatInfo previousFormatInfo)
   at MigraDoc.Rendering.ParagraphRenderer.Format(Area area, FormatInfo previousFormatInfo)
   at MigraDoc.Rendering.TopDownFormatter.FormatOnAreas(XGraphics gfx, Boolean topLevel)
   at MigraDoc.Rendering.FormattedDocument.Format(XGraphics gfx)
   at MigraDoc.Rendering.DocumentRenderer.PrepareDocument()
   at MigraDoc.Rendering.PdfDocumentRenderer.PrepareDocumentRenderer(Boolean prepareCompletely)
   at MigraDoc.Rendering.PdfDocumentRenderer.PrepareRenderPages()
   at MigraDoc.Rendering.PdfDocumentRenderer.RenderDocument()
   at EmailQueue.AddCopyToEFolder.<Run>d__3.MoveNext()


If I add paragraph.Format.Font.Color = Color.FromCmyk(100, 30, 20, 50); Then I get a different error:

Code:
System.ArgumentNullException: Value cannot be null.
Parameter name: buffer
   at PdfSharp.Drawing.FontHelper.CalcChecksum(Byte[] buffer)
   at PdfSharp.Drawing.XFontSource.GetOrCreateFrom(Byte[] bytes)
   at PdfSharp.Fonts.FontFactory.ResolveTypeface(String familyName, FontResolvingOptions fontResolvingOptions, String typefaceKey)
   at PdfSharp.Drawing.XGlyphTypeface.GetOrCreateFrom(String familyName, FontResolvingOptions fontResolvingOptions)
   at PdfSharp.Drawing.XFont.Initialize()
   at MigraDoc.Rendering.FontHandler.FontToXFont(Font font, PdfFontEncoding encoding)
   at MigraDoc.Rendering.ParagraphRenderer.get_CurrentFont()
   at MigraDoc.Rendering.ParagraphRenderer.InitFormat(Area area, FormatInfo previousFormatInfo)
   at MigraDoc.Rendering.ParagraphRenderer.Format(Area area, FormatInfo previousFormatInfo)
   at MigraDoc.Rendering.TopDownFormatter.FormatOnAreas(XGraphics gfx, Boolean topLevel)
   at MigraDoc.Rendering.FormattedDocument.Format(XGraphics gfx)
   at MigraDoc.Rendering.DocumentRenderer.PrepareDocument()
   at MigraDoc.Rendering.PdfDocumentRenderer.PrepareDocumentRenderer(Boolean prepareCompletely)
   at MigraDoc.Rendering.PdfDocumentRenderer.PrepareRenderPages()
   at MigraDoc.Rendering.PdfDocumentRenderer.RenderDocument()
   at EmailQueue.AddCopyToEFolder.<Run>d__3.MoveNext()


I honestly just want to get a plain text document, so if there is an easier way to do this, I'm happy to listen


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PostPosted: Fri Sep 20, 2019 9:30 am 
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PDFsharp Guru
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Joined: Mon Oct 16, 2006 8:16 am
Posts: 3004
Location: Cologne, Germany
Already discussed on SO:
https://stackoverflow.com/a/57994361/162529

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Thomas Hoevel
PDFsharp Team


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PostPosted: Fri Sep 20, 2019 3:30 pm 
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Joined: Thu Sep 19, 2019 8:23 pm
Posts: 2
I was able to get the pdf to render correctly now thanks. Is there a way to use Pdf sharp to save to a byte array as if I had used a File.ReadAllBytes(path) without saving using pdfDoc.save(path) and then using File.ReadAll Bytes(path)?


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PostPosted: Sun Sep 22, 2019 10:29 pm 
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PDFsharp Expert
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Joined: Sat Mar 14, 2015 10:15 am
Posts: 502
Location: CCAA
The best you can do is saving to a MemoryStream to avoid all file I/O.

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


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PostPosted: Mon Sep 23, 2019 10:56 am 
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PDFsharp Guru
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Joined: Mon Oct 16, 2006 8:16 am
Posts: 3004
Location: Cologne, Germany
alel3001 wrote:
I was able to get the pdf to render correctly now thanks.
It might help others here if you tell us how you got it to render correctly.
You did not accept an answer on SO.

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Thomas Hoevel
PDFsharp Team


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