How to build NAPS2

[didier31]

Hi,

I've not seen any guidelines for building from sources.
Is it possible to build NAPS2 with mono ?

I would like to port it to my desktop OS, FreeBSD.

Thank you a lot.

[cyanfish]

Build instructions are on the Github wiki.

NAPS2 uses dotnet (not mono) which it looks like has partial unofficial support on FreeBSD, so it might be possible.

Some notes:

• SANE support should probably be easy (at most fix some paths)
• Assuming you want to use the GTK3 UI, I'm not sure how well that will work with FreeBSD (might be ok or you might have issues with GtkSharp linking to the right native files)
• You'll need a native build of Pdfium (from Chromium) if you want to be able to import PDFs
• You'll need a native build of Tesseract if you want to be able to use OCR

Assuming you manage to get this started, I'd be very happy to help, so feel free to ask if you need pointers to anything on the NAPS2 end etc.

[didier31]

Nowadays, I'm trying to port naps2 to freebsd.
Build is completed.

Nevertheless, run failed. I don't understand why the target intends to load libdl.so.2 while I've replaced by libdl.so.

dotnet clean doesn't change anything.

$ PROTOBUF_PROTOC=/usr/local/bin/protoc dotnet run -f net8 -p:TargetFrameworks=net8
_PROTOBUF_PROTOC=/usr/local/bin/protoc dotnet run -f net8 -p:TargetFrameworks=net8
Unhandled exception. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.TypeInitializationException: The type initializer for 'Gtk.Application' threw an exception.
---> System.DllNotFoundException: Unable to load shared library 'libdl.so.2' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you're using glibc, consider setting the LD_DEBUG environment variable:
Cannot open "/usr/home/didier/git/naps2/NAPS2.App.Gtk/bin/Debug/net8/freebsd-x64/libdl.so.2"
Shared object "libdl.so.2" not found, required by "naps2"
Cannot open "/usr/home/didier/git/naps2/NAPS2.App.Gtk/bin/Debug/net8/freebsd-x64/liblibdl.so.2"
Shared object "liblibdl.so.2" not found, required by "naps2"
Cannot open "/usr/home/didier/git/naps2/NAPS2.App.Gtk/bin/Debug/net8/freebsd-x64/libdl.so.2.so"
Shared object "libdl.so.2.so" not found, required by "naps2"
Cannot open "/usr/home/didier/git/naps2/NAPS2.App.Gtk/bin/Debug/net8/freebsd-x64/liblibdl.so.2.so"
Shared object "liblibdl.so.2.so" not found, required by "naps2"

at FuncLoader.Linux.dlopen(String path, Int32 flags)
at FuncLoader.LoadLibrary(String libname)
at GLibrary.TryGet(Library library, IntPtr& ret)
at GLibrary.Load(Library library)
at Gtk.Application..cctor()
--- End of inner exception stack trace ---
at Gtk.Application.InitCheck(String progname, String[]& args)
at Eto.GtkSharp.Helper.Init()
at Eto.GtkSharp.Forms.ApplicationHandler.Initialize()
at Eto.WidgetHandler1.Eto.Widget.IHandler.Initialize() at Eto.Widget.Initialize() at Eto.Widget..ctor() at Eto.Forms.Application..ctor(InitHelper init) at Eto.Forms.Application..ctor(Platform platform) at Eto.Forms.Application..ctor(String platformType) at NAPS2.EtoForms.Gtk.GtkEtoPlatform.CreateApplication() in /usr/home/didier/git/naps2/NAPS2.Lib.Gtk/EtoForms/Gtk/GtkEtoPlatform.cs:line 23 at NAPS2.EntryPoints.GuiEntryPoint.Run(String[] args, Module imageModule, Module guiModule) in /usr/home/didier/git/naps2/NAPS2.Lib/EntryPoints/GuiEntryPoint.cs:line 39 at NAPS2.EntryPoints.GtkEntryPoint.Run(String[] args) in /usr/home/didier/git/naps2/NAPS2.Lib.Gtk/EntryPoints/GtkEntryPoint.cs:line 24 at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor) at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span1 copyOfArgs, BindingFlags invokeAttr)
--- End of inner exception stack trace ---
at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
at System.Reflection.MethodBaseInvoker.InvokeWithOneArg(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at NAPS2.Program.Main(String[] args) in /usr/home/didier/git/naps2/NAPS2.App.Gtk/Program.cs:line 13_

I'm out of idea, certainly because I'm not experienced.

Maybe, an experienced one could help.

Thank you by advance.

[cyanfish]

GtkSharp references libdl.so.2 directly
https://github.com/GtkSharp/GtkSharp/blob/b7303616129ab5a0ca64def45649ab522d83fa4a/Source/Libs/Shared/FuncLoader.cs#L17

And so does NAPS2

naps2/NAPS2.Sdk/Platform/Linux/LinuxInterop.cs

Line 7 in 798fcaa

[DllImport("libdl.so.2")]

Either you'd need to fork GtkSharp and change that, or maybe easier is to try and make a symlink from libdl.so.2 to libdl.so

[didier31]

Hum ... I couldn't expect that. GtkSharp is downloaded by the maker, I guess.
Ok, I keep the info. Fortunately, there is a freebsd gtksharp port.
Thank you a lot.

[didier31]

Build instructions are on the Github wiki.

Sorry. I expected it should be decribed in the root directory.

NAPS2 uses dotnet (not mono) which it looks like has partial unofficial support on FreeBSD, so it might be possible.

$ pkg search dotnet
dotnet-sdk-2.1.201 Cross-platform .NET implementation (Software Development Kit)
[https://www.freshports.org/lang/dotnet/]
Seems to be outdated wiki.

Some notes:

* SANE support should probably be easy (at most fix some paths)

* Assuming you want to use the GTK3 UI, I'm not sure how well that will work with FreeBSD (might be ok or you might have issues with GtkSharp linking to the right native files)

* You'll need a native build of Pdfium (from Chromium) if you want to be able to import PDFs

Not a stand-alone FreeBSD port but Chromium is, nevertheless.

* You'll need a native build of Tesseract if you want to be able to use OCR

The port exists on FreeBSD.

Assuming you manage to get this started, I'd be very happy to help, so feel free to ask if you need pointers to anything on the NAPS2 end etc.

Thank you a lot.
I'm attempting to port your software.
Good evening (19:14 PM in France)

[didier31]

Nice 👍

$ dotnet --info
**SDK .NET :
Version: 8.0.100
Commit: 57efcf1350
Workload version: 8.0.100-manifests.2d90560f

Environnement d'exécution :
OS Name: FreeBSD
OS Version: 13
OS Platform: FreeBSD
RID: freebsd-x64
Base Path: /usr/local/dotnet/sdk/8.0.100/

Charges de travail .NET installées :
Workload version: 8.0.100-manifests.2d90560f
Il n'y a aucune charge de travail installée à afficher.

Host:
Version: 8.0.0
Architecture: x64
Commit: 5535e31a71

.NET SDKs installed:
8.0.100 [/usr/local/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 8.0.0 [/usr/local/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.0 [/usr/local/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
Not set

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download**

[DrBassman]

I'm also wanting to get naps2 running on FreeBSD...Do you have it working yet? If so, do you have a "HOWTO" on how you managed to compile source for FreeBSD?

Thank you.

[didier31]

Not a this time, busy by other stuff but I can help you to start.

1 ) Dependencies

dotnet-8.0.0 Open-source developer platform and a cross-platform runtime for cloud, mobile, desktop, and IoT apps
grpc-1.62.2,2 HTTP/2-based RPC framework
gtk3-3.24.41 Gimp Toolkit for X11 GUI (current stable version)
protobuf-24.4,1 Data interchange format library

2 ) patch to apply

patch.txt

3 ) Build and Run

$ cd NAPS2.App.Gtk
$ PROTOBUF_PROTOC=protoc dotnet run

Unhandled exception. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.TypeInitializationException: The type initializer for 'Gtk.Application' threw an exception.
---> System.DllNotFoundException: Gtk: libgtk-3-0.dll, libgtk-3.so.0, libgtk-3.0.dylib, gtk-3.dll
at GLibrary.Load(Library library)
at Gtk.Application..cctor()
--- End of inner exception stack trace ---
at Gtk.Application.InitCheck(String progname, String[]& args)
at Eto.GtkSharp.Helper.Init()
at Eto.GtkSharp.Forms.ApplicationHandler.Initialize()
at Eto.WidgetHandler1.Eto.Widget.IHandler.Initialize() at Eto.Widget.Initialize() at Eto.Widget..ctor() at Eto.Forms.Application..ctor(InitHelper init) at Eto.Forms.Application..ctor(Platform platform) at Eto.Forms.Application..ctor(String platformType) at NAPS2.EtoForms.Gtk.GtkEtoPlatform.CreateApplication() in /usr/home/didier/git/naps2/NAPS2.Lib.Gtk/EtoForms/Gtk/GtkEtoPlatform.cs:line 23 at NAPS2.EntryPoints.GuiEntryPoint.Run(String[] args, Module imageModule, Module guiModule) in /usr/home/didier/git/naps2/NAPS2.Lib/EntryPoints/GuiEntryPoint.cs:line 39 at NAPS2.EntryPoints.GtkEntryPoint.Run(String[] args) in /usr/home/didier/git/naps2/NAPS2.Lib.Gtk/EntryPoints/GtkEntryPoint.cs:line 24 at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor) at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span1 copyOfArgs, BindingFlags invokeAttr)
--- End of inner exception stack trace ---
at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
at System.Reflection.MethodBaseInvoker.InvokeWithOneArg(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at NAPS2.Program.Main(String[] args) in /usr/home/didier/git/naps2/NAPS2.App.Gtk/Program.cs:line 13

[didier31]

Finally, it doesn't change anything.
I've checked by comparing GtkSharp.dll versions in NAPS2.App.Gtk/bin/Debug with .nuget local repo. Same file.

If I could rebuild in debug GtkSharp...

[cyanfish]

I installed a FreeBSD VM and am trying to repro - did you encounter this error?

[didier31]

Yes, I did. I've just installed a soft link to /usr/local/bin/grpc_csharp_plugin to workaround.

[cyanfish]

Thanks, it also looks like PROTOBUF_PROTOC=protoc GRPC_PROTOC_PLUGIN=/usr/local/bin/grpc_csharp_plugin dotnet run works too.

Doing some testing it seems like dlopen is not working at all - it always returns 0, and dlerror seems to crash the dotnet process so no idea what's going on there. NativeLibrary.Load does work but that's not currently used in GtkSharp.

[didier31]

I've tried to build GtkSharp 117-develop on FreeBSD for debugging but I have trouble with the installation of an addin of cake.
I've sent a message to the cake's team. I'm waiting their answer.