Gtkmm problem

[matmatmat]

I have this code:


#include <libglademm/xml.h>
#include <gtkmm.h>
#include <iostream>


#ifdef ENABLE_NLS
# include <libintl.h>
#endif


/* For testing propose use the local (not installed) glade file */
/* #define GLADE_FILE PACKAGE_DATA_DIR"/gtk_foobar/glade/gtk_foobar.glade" */
#define GLADE_FILE "gtk_foobar.glade"

Gtk::Window* main_win = 0;

static void on_button_clicked()
{
std:: cout << "h";
}


int
main (int argc, char *argv[])
{
Gtk::Main kit(argc, argv);

//Load the Glade file and instiate its widgets:
Glib::RefPtr<Gnome::Glade::Xml> refXml;
try
{
refXml = Gnome::Glade::Xml::create(GLADE_FILE);
}
catch(const Gnome::Glade::XmlError& ex)
{
std::cerr << ex.what() << std::endl;
return 1;
}
refXml->get_widget("main_window", main_win);
if (main_win)
{
kit.run(*main_win);
}
Gtk::Button* mButton = 0;
refXml->get_widget("mysuperbutton", mButton);
if (mButton){
mButton->signal_clicked().connect( sigc::ptr_fun(on_button_clicked) );
}
return 0;
}

but when you click the button nothing happens

[SledgeHammer_999]

Maybe because you have a space between "::" and "cout"? If it isn't a copy/paste typo then the above code shouldn't compile.

correct

static void on_button_clicked()
{
std::cout << "h";
}

EDIT:
Ooops sorry. I think the actual proplem is here. You forgot an '&'


mButton->signal_clicked().connect( sigc::ptr_fun(&on_button_clicked) );

Link about gtkmm signals-->http://library.gnome.org/devel/gtkmm-tutorial/unstable/sec-connecting-signal-handlers.html.en

[matmatmat]

Thanks, but it still doesn't work

[SledgeHammer_999]

maybe mButton == NULL

[matmatmat]

No, that hasn't worked, thanks though

[MadCow108]

I can't see a problem (with the included &)
so either the problem is somewhere else (in the glade file)
or its just that the endl is missing in the cout so you don't see the h when the button is clicked because the buffer is never flushed
so try adding a << std::endl (or a std::cout.flush())
then check is mbutton is not null
when it still not works the problem lies in the glade file

[matmatmat]

Must be the glade file:


<?xml version="1.0"?>
<glade-interface>
<!-- interface-requires gtk+ 2.16 -->
<!-- interface-naming-policy toplevel-contextual -->
<widget class="GtkWindow" id="main_window">
<property name="visible">True</property>
<property name="title" translatable="yes">Hello World!</property>
<property name="default_width">500</property>
<property name="default_height">400</property>
<child>
<widget class="GtkButton" id="mysuperbutton">
<property name="label" translatable="yes">button</property>
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="receives_default">True</property>
<signal name="clicked" handler="on_button_clicked"/>
</widget>
</child>
</widget>
</glade-interface>

c++


#include <libglademm/xml.h>
#include <gtkmm.h>
#include <iostream>


#ifdef ENABLE_NLS
# include <libintl.h>
#endif


/* For testing propose use the local (not installed) glade file */
/* #define GLADE_FILE PACKAGE_DATA_DIR"/gtk_foobar/glade/gtk_foobar.glade" */
#define GLADE_FILE "gtk_foobar.glade"

Gtk::Window* main_win = NULL;

void on_button_clicked()
{
main_win->hide();
std::cout << "H" << std::endl;
}



int
main (int argc, char *argv[])
{
Gtk::Main kit(argc, argv);

//Load the Glade file and instiate its widgets:
Glib::RefPtr<Gnome::Glade::Xml> refXml;
try
{
refXml = Gnome::Glade::Xml::create(GLADE_FILE);
}
catch(const Gnome::Glade::XmlError& ex)
{
std::cerr << ex.what() << std::endl;
return 1;
}
refXml->get_widget("main_window", main_win);
if (main_win)
{
kit.run(*main_win);
}
Gtk::Button* mButton = NULL;
refXml->get_widget("mysuperbutton", mButton);
if (mButton){
mButton->signal_clicked().connect(sigc::ptr_fun(&on_button_clicked));
}
return 0;
}

[MadCow108]

oops strange I didn't see that earlier:
your running the run() function before connecting the signal
move that to the end of main:


if (main_win)
{
kit.run(*main_win);
}

[matmatmat]

Thanks, that worked! Why's it always simple things...?

[SledgeHammer_999]

+1 to MadCow108

EDIT:
@matmatmat .run() blocks until main_win is hidden, that's why the signal doesn't get connected.