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Hello World freezing
https://forum.pdfsharp.net/viewtopic.php?f=2&t=3417		 Page 1 of 1
Author:  haf [ Tue Aug 09, 2016 7:40 am ]
Post subject:  Hello World freezing
I'm having some trouble getting started with the Hello World sample.

I have this code (from HelloWorld):

Code:
#I "../../packages/PDFSharp-MigraDoc/lib/net20/"
#r "PdfSharp.dll"
#r "MigraDoc.Rendering.dll"
#r "MigraDoc.DocumentObjectModel.dll"
open PdfSharp
open PdfSharp.Pdf
open PdfSharp.Drawing
open System.IO

let generate () =
    let d = new PdfDocument()
    let p = d.AddPage()
    let gfx = XGraphics.FromPdfPage p
    let font = XFont("Arial", 15., XFontStyle.Regular)
    let topLeft = XPoint (0., 0.)
    gfx.DrawString("Hello, World!",
                   font, XBrushes.Black,
                   XRect(topLeft, XSize(100., 20.)),
                   XStringFormats.Center)
    use fs = File.OpenWrite("./HelloWorld.pdf")
    d.Save(fs)

Generation.generate ()


But it just hangs on DrawString with one core pegged at 100%.

Packages in use:

Code:
NUGET
  remote: https://www.nuget.org/api/v2
    FSharp.Core (4.0.0.1)
    PDFsharp-MigraDoc (1.50.4000-beta3b)


Runtime version:

Code:
$ mono --version
Mono JIT compiler version 4.4.2 (mono-4.4.0-branch-c7sr1/f72fe45 Wed Jul 27 16:20:13 EDT 2016)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
   TLS:           normal
   SIGSEGV:       altstack
   Notification:  kqueue
   Architecture:  x86
   Disabled:      none
   Misc:          softdebug
   LLVM:          yes(3.6.0svn-mono-master/a173357)
   GC:            sgen


Same for nuget PdfSharp (1.32.3057)
Author:  () => true [ Tue Aug 09, 2016 11:51 am ]
Post subject:  Re: Hello World freezing
Hi!

Things you can try:
  • Add a Font Resolver (implement IFontResolver) and use a private font (your framework could be unable to read the font Arial from the operating system - it should not hang and it does not hang under Windows, but things could be different with Mono)
  • Use the source code package - this allows you to step through DrawString to see where it hangs
  • Try if the C# Hello World sample works
  • Try the F# sample under Windows
Author:  haf [ Wed Aug 10, 2016 5:54 pm ]
Post subject:  Re: Hello World freezing
Hi there,

Sure I can try that; but to "implement your own font resolver" is a high threshold to cross as a beginning user of a library.

How about I send a PR to integration-test on Travis CI, if you point me to the github repository I can do it for? That way, perhaps you could have a look at testing your project and I'll can focus on what I'm good at?
Author:  () => true [ Wed Aug 10, 2016 9:28 pm ]
Post subject:  Re: Hello World freezing
haf wrote:
Sure I can try that; but to "implement your own font resolver" is a high threshold to cross as a beginning user of a library.
Using a font resolver is rather simple IMHO.
You can use this implementation:
viewtopic.php?p=9576#p9576

haf wrote:
How about I send a PR to integration-test on Travis CI, if you point me to the github repository I can do it for?
Which GitHub repository?
PDFsharp can be found here: https://github.com/empira/PDFsharp
Author:  haf [ Thu Aug 11, 2016 8:48 pm ]
Post subject:  Re: Hello World freezing
It would seem this is the culprit:

Quote:
System.DllNotFoundException: user32.dll
at (wrapper managed-to-native) PdfSharp.Internal.NativeMethods:GetDC (intptr)
at PdfSharp.Drawing.XFontSource.ReadFontBytesFromGdi (System.Drawing.Font gdiFont) <0x7d2e210 + 0x00037> in <filename unknown>:0
at PdfSharp.Drawing.XFontSource.GetOrCreateFromGdi (System.String typefaceKey, System.Drawing.Font gdiFont) <0x7d2e1d0 + 0x00013> in <filename unknown>:0
at PdfSharp.Fonts.PlatformFontResolver.CreateFontSource (System.String familyName, PdfSharp.Fonts.FontResolvingOptions fontResolvingOptions, System.Drawing.Font& font, System.String typefaceKey) <0x6ac3310 + 0x0011b> in <filename unknown>:0
at PdfSharp.Fonts.PlatformFontResolver.ResolveTypeface (System.String familyName, PdfSharp.Fonts.FontResolvingOptions fontResolvingOptions, System.String typefaceKey) <0x6ac3038 + 0x0009b> in <filename unknown>:0
at PdfSharp.Fonts.FontFactory.ResolveTypeface (System.String familyName, PdfSharp.Fonts.FontResolvingOptions fontResolvingOptions, System.String typefaceKey) <0x6ac2c00 + 0x0039f> in <filename unknown>:0
at PdfSharp.Drawing.XGlyphTypeface.GetOrCreateFrom (System.String familyName, PdfSharp.Fonts.FontResolvingOptions fontResolvingOptions) <0x6ac24a0 + 0x0005f> in <filename unknown>:0
at PdfSharp.Drawing.XFont.Initialize () <0x6ac2330 + 0x00113> in <filename unknown>:0
at PdfSharp.Drawing.XFont..ctor (System.String familyName, Double emSize, XFontStyle style, PdfSharp.Drawing.XPdfFontOptions pdfOptions) <0x6ac22b0 + 0x00067> in <filename unknown>:0
at PdfSharp.Drawing.XFont..ctor (System.String familyName, Double emSize, XFontStyle style) <0x6ac2048 + 0x00057> in <filename unknown>:0
at FSI_0001+Generation.generate () <0x72d24b0 + 0x000af> in <filename unknown>:0
at <StartupCode$FSI_0001>.$FSI_0001.main@ () <0x6abe540 + 0x00013> in <filename unknown>:0
at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) <0x1a7ea40 + 0x000a1> in <filename unknown>:0
Author:  () => true [ Fri Aug 12, 2016 6:08 am ]
Post subject:  Re: Hello World freezing
So the problem is with "ReadFontBytesFromGdi" - it seems the functions called by this method are not supported on your system.
Try IFontResolver or EZFontResolver and this method should no longer be called.
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