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.NET Libraries Loading from native application

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MaxM74:
is there a way to use a library written in .NET from an application written in lazarus/fpc?

I downloaded and looked at this Bridge library written in c++, so theoretically it is possible to do it from pascal too.

https://www.codeproject.com/Articles/42319/Using-NET-Classes-Modules-from-Native-Cplusplus

I didn't find anything written in fpc or delphi

Thaddy:
It is possible, though not recommended in more than one way.
The easiest way is to treat the .net libraries as COM: they usually contain a type library.
This works on Windows, I never even tried to use that with mono on linux.
There are examples here on this forum that do it the hard way.
Also have a look at p/invoke and/or mkbundle that both creates libraries that freepascal can use.

(if I need C#, I tend to write everything in C#)

d2010:
Hello
I found two parallel routines

--- Code: ---#include "StdAfx.h"
#include "ManagedProxy.h"
//Here is C++ inside ManagedProxy.cpp
using namespace System;
using namespace System::Runtime::InteropServices;
using namespace System::Reflection;

--- End code ---



--- Code: ---using System;
using System.Text;
using System.Diagnostics;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.IO;
Here is C#
        [CommandMethod("samp32")]
        public static void samp32()
        {
            _AcEd.Editor ed = _AcAp.Application.DocumentManager.MdiActiveDocument.Editor;
            try
            {
                Bricscad.Windows.OpenFileDialog dlg =
                  new Bricscad.Windows.OpenFileDialog("Test", "Drawing", "dwg", "Bricscad File Nav",
                    _AcWnd.OpenFileDialog.OpenFileDialogFlags.AllowAnyExtension |
                    _AcWnd.OpenFileDialog.OpenFileDialogFlags.AllowMultiple);

                if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    foreach (String file in dlg.GetFilenames())
                        ed.WriteMessage(file);
                }
            }
            catch (System.Exception ex)
            {
                ed.WriteMessage(ex.Message);
            }
        }

--- End code ---

Solution01 ,  ;D
step00=you start any app.cpp.exe with NativeToManagedBridge.dll
step01=you extract all DLL.names. files from NativeToManagedBridge.dll
step02=you search all 'dll.names outoff C# from step01
you extract all 'DLL.names inside  C++ from step01
step03=You write sample MINICALL.LPI  OR MINICALL.DPR (e.g consoleapp)
step04=You load all 'DLL from step02 but inside C++
Cele mai frumoase rugăciuni ale Pr. Arsenie Boca. Multumesc.
Anyone can remaster source ..
Thank you.

Thaddy:
I found some good answers here later:
Ask this to DeepSeek.com ....:
"can you point me the directions to use libraries written in C#/Mono in Freepascal?"

Came up with pretty much the same as I wrote already... :P
But with working - well, slight mods needed - example code.

gidesa:
Hello,
a FPC program can use a C# DLL in these cases:
- as said from Thaddy, the C# DLL exports COM (activeX) classes, and you are on Windows  (it's possible
  also to use COM Dll not previously registered with regsvr32)
- the C# library exports C-style functions.

There is also a very old unit from Jedi project, called  JclDotNet.pas, to call directly Net functions
inside an assembly.
See here:
https://adamjohnston.me/delphi-dotnet-interop-with-jvcl/

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