RE: Callbacks when glade file is loaded using a dynamic library

[dfg dfg <abxccd msn com>]

Hi Tristan,

 

As per my second post, I have been compiling my .so dynamic library and "myapp" with the --export-dynamic 
flag.

 

I have however, solved the problem. The solution was to replace the dlopen() and other related functions with 
the correspondening functions in the g_module family.

 

Cheers for your help :)
 
> Date: Fri, 23 Apr 2010 11:04:38 -0400
> Subject: Re: Callbacks when glade file is loaded using a dynamic library
> From: tvb gnome org
> To: abxccd msn com; gtk-app-devel-list gnome org
>
> On Fri, Apr 23, 2010 at 4:40 AM, dfg dfg <abxccd msn com> wrote:
> > Hi Tristan,
> >
> > I am not sure if the symbols need to be visible in "myapp". Currently, myapp
> > attaches a glade file to create its interface and uses dlopen to open the
> > .so dynamic library. The .so library loads its own GTK Builder which loads a
> > second glade file and attaches it to a container in myapp's glade file.
>
> Your app has callbacks that need to be looked up by GtkBuilder.
>
> Your plugin has also callbacks that need to be looked up by GtkBuilder
>
> The fact you have a plugin and an app is completely besides the point.
>
> You need to expose the symbols in your *_app_* so that GtkBuider can
> read those symbols from the global namespace... of your app... to load
> callbacks in your glade file that can only be found in your *app*, which
> needs to be compiled with --export-dynamic ... did you try that yet before
> writing back to the list please ?
>
> Thanks,
> -Tristan
>
>
> > At present state, the callbacks in the .so library are not being found by
> > the GTK Builder loaded by the dynamic library.
> > However, callbacks contained in "myapp" works perfectly with the glade file
> > loaded by myapp.
> >
> > I am quite new at this, so can you please explain what you mean by "export
> > the symbols of my app"?
> >
> > Cheers :)
> >
> > > Date: Thu, 22 Apr 2010 22:08:44 -0400
> > > Subject: Re: Callbacks when glade file is loaded using a dynamic library
> > > From: tvb gnome org
> > > To: abxccd msn com
> > > CC: gtk-app-devel-list gnome org
> > >
> > > If you have symbols that need to be visible in 'myapp', they need to be
> > > exported to in order to by found by a g_module_lookup(); did you also
> > > export the symbols of you app ?
> > >
> > > Cheers,
> > > -Tristan
> > >
> > > On Thu, Apr 22, 2010 at 9:53 PM, dfg dfg <abxccd msn com> wrote:
> > > > Thank you Tristan.
> > > >
> > > > I actually tried the --export-dynamic flag before posting, but could not
> > > > get
> > > > it to work. I feel that it is most likely a problem in my makefile.am (I
> > > > am
> > > > using automake and libtool to generate the makefiles).
> > > >
> > > > Here is the make file for the compilation of the dynamic library:
> > > >
> > > > libmyplugin= /
> > > > libmyplugin_LTLIBRARIES=libmyplugin.la
> > > > libmyplugin_la_SOURCES=libmyplugin.c libmyplugincallbacks.c
> > > > include_HEADERS = libmyplugincallbacks.h
> > > > libmyplugin_la_LDFLAGS= -lc -lgcc -avoid-version @PACKAGE_LDFLAGS@
> > > > libmyplugin_la_LIBDADD = --export-dynamic @PACKAGE_LIBS@
> > > > INCLUDES = @PACKAGE_CFLAGS@
> > > >
> > > > Here is my configure.ac
> > > >
> > > > AC_PREREQ(2.59)
> > > > AC_INIT(myapp, 1.0)
> > > > PKG_CHECK_MODULES(GTK, gtk+-2.0 gmodule-2.0 gmodule-export-2.0)
> > > > PACKAGE_CFLAGS="-g -Wall $GTK_CFLAGS"
> > > > PACKAGE_LIBS="-g $GTK_LIBS -ltar"
> > > > PACKAGE_LDFLAGS="-Wl, --export-dynamic $GTK_LDFLAGS"
> > > > AC_SUBST(PACKAGE_CFLAGS)
> > > > AC_SUBST(PACKAGE_LIBS)
> > > > AC_SUBST(PACKAGE_LDFLAGS)
> > > > AM_PROG_LIBTOOL
> > > > AC_CANONICAL_SYSTEM
> > > > AM_INIT_AUTOMAKE()
> > > > AC_PROG_CC
> > > > AC_CONFIG_FILES(Makefile src/Makefile src/modules/Makefile
> > > > src/modules/libmyplugin/Makefile)
> > > > AC_OUTPUT
> > > >
> > > > For some reason though, callbacks in "myapp" the main app that loads in
> > > > the
> > > > .so files work fine. Any ideas appreciated. :)
> > > >
> > > >
> > > >
> > > > > Date: Thu, 22 Apr 2010 21:37:48 -0400
> > > > > Subject: Re: Callbacks when glade file is loaded using a dynamic
> > > > > library
> > > > > From: tvb gnome org
> > > > > To: abxccd msn com
> > > > > CC: gtk-app-devel-list gnome org
> > > > >
> > > > > On Thu, Apr 22, 2010 at 7:21 PM, dfg dfg <abxccd msn com> wrote:
> > > > > > Hi everyone,
> > > > > >
> > > > > > Currently, I have built my main application using glade. This file is
> > > > > > then loaded by a C application.
> > > > > >
> > > > > > I then created another interface using Glade. When my main
> > > > > > application
> > > > > > loads, it loads a .so library which contains code for this subsection
> > > > > > (kind
> > > > > > of like a plugin).
> > > > > >
> > > > > > The .so file loads in the second glade file and attaches it into the
> > > > > > interface of the main application. This all works problem.
> > > > > >
> > > > > > The problem I am facing now is that gtk_builder_connect_signals
> > > > > > (builder, NULL); does not work.
> > > > > >
> > > > > > For my .so file, i have 3 files:
> > > > > >
> > > > > >   -libmyplugin.c
> > > > > >   -libmyplugincallbacks.h
> > > > > >   -libmyplugincallbacks.c
> > > > > >
> > > > > >
> > > > > > My code for the libmyplugin.c file looks like this:
> > > > > >
> > > > > >   #include <stdlib.h>
> > > > > >   #include <gtk/gtk.h>
> > > > > >   #include "libmyplugincallbacks.h"
> > > > > >
> > > > > >   #define GUI "libmyplugingui.ui"
> > > > > >   int startplugin(){
> > > > > >      extern *mainBuilder;
> > > > > >      GtkBuilder *subbuilder;
> > > > > >
> > > > > >      //Do things like attach the glade file into the main glade file.
> > > > > >      gtk_builder_connect_signals (builder, NULL);
> > > > > >
> > > > > >   }
> > > > > >
> > > > > >
> > > > > >
> > > > > > My libmyplugincallbacks.h
> > > > > >
> > > > > >   #include <gtk/gtk.h>
> > > > > >
> > > > > >   void myfunc (GtkCellRenderer *cell, GtkCellEditable *editable,
> > > > > > const
> > > > > > gchar *path, gpointer data);
> > > > > >
> > > > > >
> > > > > >
> > > > > > My libplugincallbacks.c
> > > > > >
> > > > > >   #ifdef HAVE_CONFIG_H
> > > > > >   #  include <config.h>
> > > > > >   #endif
> > > > > >
> > > > > >   #include "libmyplugincallbacks.h"
> > > > > >   #include <string.h>
> > > > > >
> > > > > >   void myfunc(GtkCellRenderer *cell, GtkCellEditable *editable, const
> > > > > > gchar *path, gpointer data){
> > > > > >     if (GTK_IS_ENTRY (editable))
> > > > > >       {
> > > > > >       //Do stuff
> > > > > >       }
> > > > > >   }
> > > > > >
> > > > > >
> > > > > >
> > > > > > When I compile my program, the .so file compiles properly. However,
> > > > > > when
> > > > > > ever I run the program, it loads the .so file. Once GTK builder gets
> > > > > > to the
> > > > > > stage where it connects the signals, it will complain that "myfunc"
> > > > > > cannot
> > > > > > be found. I have double checked the name of the function in my glade
> > > > > > file
> > > > > > and it is spelt and entered correctly.
> > > > >
> > > > > You generally need to export your symbols by linking the app with
> > > > > --export-dynamic flag:
> > > > >
> > > > > pkg-config --libs gmodule-2.0
> > > > >
> > > > > Should do the right thing to make your symbols visible.
> > > > >
> > > > > Cheers,
> > > > > -Tristan
> > > >
> > > > ________________________________
> > > > Hotmail & Messenger. Get them on your phone now.
> >
> > ________________________________
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