[Mono-list] Embedding Mono
Jeremy
jswigart at gmail.com
Mon Feb 5 22:45:16 EST 2007
Oh damn, I didn't think I needed it for each definition(I'm still relatively
new to C#). Sorry about that. Sorry about the reply as well. I usually don't
have to hit reply to all in my other mailing lists. I'll pay more attention
next time.
Do you know of an example/code snippet that shows how to pass custom types,
like a reference/pointer to a user type between such functions? Appreciate
the help alot.
Jeremy
On 2/5/07, Jon Chambers <joncham at gmail.com> wrote:
>
> Jeremy,
> Please remember to respond to list, not just me. I figured out your
> problem. You are not marking your C# methods with the [MethodImplAttribute(
> MethodImplOptions.InternalCall)] attribute.
>
> class MonoEmbed
> {
> [MethodImplAttribute(MethodImplOptions.InternalCall )]
> extern public static string gimme();
> [MethodImplAttribute(MethodImplOptions.InternalCall )] // you need
> this
> extern public static int gimme2();
> }
>
>
> Note that your code above does not even compile with mcs or gmcs; they
> report an error while csc just gives a warning. You must be compiling
> test.cs in VS. That is the bug; I filed one for this #80735. If you add
> the correct attribute all your calls should be fine.
>
> Thanks,
> Jonathan
>
> On 2/5/07, Jeremy <jswigart at gmail.com> wrote:
> >
> > Ok, taking the embed example in teste.c, which has this c bound function
> >
> > static MonoString*gimme ()
> > {
> > return mono_string_new (mono_domain_get (), "All your monos are
> > belong to us!");
> > }
> >
> > static int gimme2 () // I added this
> > {
> > return 10;
> > }
> >
> > and below uses
> >
> > mono_add_internal_call ("MonoEmbed::gimme", gimme);
> > mono_add_internal_call ("MonoEmbed::gimme2", gimme2); // I added this
> >
> > and here's my seperate test prog,
> >
> > // Class1.cs
> > using System;
> > using System.Collections.Generic;
> > using System.Text;
> > using System.Runtime.CompilerServices;
> >
> > class MonoEmbed
> > {
> > [MethodImplAttribute(MethodImplOptions.InternalCall )]
> > extern public static string gimme();
> > extern public static int gimme2(); // I added this
> > }
> >
> > namespace Test
> > {
> > public class Class1
> > {
> > public static void Main(string[] args)
> > {
> > System.Console.WriteLine("Hello From Test App");
> >
> > System.Console.WriteLine(MonoEmbed.gimme());
> > System.Console.WriteLine(MonoEmbed.gimme2());
> > }
> > }
> > }
> >
> > This test app works as expected when just calling gimme(), which is what
> > the example originally had, but I guess I'm doing something wrong with my
> > additional function gimme2, because Mono crashes with the above line that
> > calls gimme2().
> >
> > I'm taking a wild guess that I need to wrap even primitive types
> > somehow, but I can't find any documentation for that. I also attempted to
> > make gimme2 like so
> >
> > static void gimme2 (MonoString*str), but it too crashed.
> >
> > Even setting gimme2 as a void function that takes no parameters crashes.
> > It's like the only variation that works is the one it comes with. I must be
> > doing something horribly wrong.
> >
> > I added the mono_add_internal_call ("MonoEmbed::gimme2", gimme2); like
> > the default gimme function was set up, and I also changed the Embed lines in
> > the C# code to match the function signature, ie
> >
> > class MonoEmbed
> > {
> > [MethodImplAttribute(MethodImplOptions.InternalCall)]
> > extern public static string gimme();
> > extern public static void gimme2();
> > }
> >
> > and still no luck.
> >
> > The error is a popup box with an ok button that says:
> > ** ERROR **: file .\mono\metadata\loader.c: line 1969: assertion failed:
> > (loc) aborting
> >
> > So in summary, I have the teste.c example included with mono, working
> > fine by default. Add another bound function and it doesn't work anymore.
> >
> > Any help is greatly appreciated. I compiled libmono and teste.c example,
> > as well as my simple test app is msvc 2005.
> >
> > On 2/5/07, Jon Chambers < joncham at gmail.com> wrote:
> > >
> > > Lots of people are embedding mono. Please post all of your code,
> > > including the C#, for more help.
> > >
> > > Thanks,
> > > Jonathan
> > >
> > > On 2/5/07, Jeremy < jswigart at gmail.com> wrote:
> > >
> > > > It's a static method I guess, exactly like the existing function in
> > > > the example. I wish I could figure out why it's not working for anything
> > > > other than the example function they provide.
> > > >
> > > > Is noone using the embedded mono stuff?
> > > >
> > > > On 2/3/07, Jonathan Pryor < jonpryor at vt.edu> wrote:
> > > > >
> > > > > On Fri, 2007-02-02 at 09:53 -0800, Jeremy wrote:
> > > > > > I've gotten the example to work, however the example shows the
> > > > > case of
> > > > > > a returning mono string. I'm getting crashes in Mono when I
> > > > > attempt to
> > > > > > define additional functions for the assembly to call back into C
> > > > > > with.
> > > > > >
> > > > > > The example shows this
> > > > > >
> > > > > > static MonoString *Sample ()
> > > > > > {
> > > > > > return mono_string_new (mono_domain_get (), "Hello!");
> > > > > > }
> > > > > >
> > > > > > which works fine, but I can't seem to get functions that take
> > > > > arguments working.
> > > > > >
> > > > > > for example:
> > > > > >
> > > > > > static MonoString* gimme2 (MonoString*a)
> > > > > > {
> > > > > > return mono_string_new (mono_domain_get (), "Hello!");
> > > > > > }
> > > > > >
> > > > > > even though I'm not even using the parameter, simply defining
> > > > > this,
> > > > > > adding it just like mono_add_internal_call, and likewise in the
> > > > > > assembly, I get a crash in mono.
> > > > > >
> > > > > > Is it possible for assembly->c functions to take parameters?
> > > > >
> > > > > Just a guess, but is your C# method an instance method or a static
> > > > >
> > > > > method? If it's an instance method, you need a `this' pointer in
> > > > > your C
> > > > > code, e.g.
> > > > >
> > > > > static MonoString*
> > > > > gimme2 (MonoObject *this, MonoString *a)
> > > > > {
> > > > > return mono_string_new (mono_domain_get (),
> > > > > "Hello!");
> > > > > }
> > > > >
> > > > > - Jon
> > > > >
> > > > >
> > > > >
> > > >
> > > > _______________________________________________
> > > > Mono-list maillist - Mono-list at lists.ximian.com
> > > > http://lists.ximian.com/mailman/listinfo/mono-list
> > > >
> > > >
> > > >
> > >
> >
>
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