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: t...@gnome.org
> To: abx...@msn.com; gtk-app-devel-list@gnome.org
>
> On Fri, Apr 23, 2010 at 4:40 AM, dfg dfg <abx...@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: t...@gnome.org
> >> To: abx...@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 <abx...@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: t...@gnome.org
> >> >> To: abx...@msn.com
> >> >> CC: gtk-app-devel-list@gnome.org
> >> >>
> >> >> On Thu, Apr 22, 2010 at 7:21 PM, dfg dfg <abx...@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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