Re: How many times can I call gtk_label_set_markup()?

[Igor Korot <ikorot01 gmail com>]

Hi, David,

2011/4/8 David Nečas <yeti physics muni cz>:
> On Fri, Apr 08, 2011 at 10:30:32AM -0700, Igor Korot wrote:
>> $ ./<program_name> G_DEBUG=fatal-warnings
>>
>> Right?
>
> No,
>
>    G_DEBUG=fatal-warnings ./program
>
> It's an environment variable:
>
>    http://developer.gnome.org/glib/stable/glib-running.html

I just tried to run it. Here are the results:

IgorsGentooOnNetwork src # G_DEBUG=fatal-warnings gdb mini2440gtk
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu"...
(gdb) break main_window.cc:282
Breakpoint 1 at 0x80496d4: file
/home/igor/mini2440gtk/mini2440gtk/src/main_window.cc, line 282.
(gdb) run
Starting program: /home/igor/mini2440gtk/mini2440gtk/debug/src/mini2440gtk
[Thread debugging using libthread_db enabled]
[New Thread 0xb7106b40 (LWP 22539)]
Header is: 0 0
Header is: 27 91

GLib-GObject-WARNING **: invalid cast from `(null)' to `GObject'
aborting...

Program received signal SIGABRT, Aborted.
[Switching to Thread 0xb7106b40 (LWP 22539)]
0xb805c424 in __kernel_vsyscall ()
(gdb) bt
#0  0xb805c424 in __kernel_vsyscall ()
#1  0xb7169660 in raise () from /lib/libc.so.6
#2  0xb716ae98 in abort () from /lib/libc.so.6
#3  0xb73d4a31 in g_logv () from /usr/lib/libglib-2.0.so.0
#4  0xb73d4ace in g_log () from /usr/lib/libglib-2.0.so.0
#5  0xb7477896 in g_type_check_instance_cast () from
/usr/lib/libgobject-2.0.so.0
#6  0xb7a14e9c in gtk_label_set_markup () from /usr/lib/libgtk-x11-2.0.so.0
#7  0x080496d4 in CFrame::UpdateData (this=0x8f48450) at
/home/igor/mini2440gtk/mini2440gtk/src/main_window.cc:281
#8  0x08049813 in CFrame::ReadData (me=0x8f48450) at
/home/igor/mini2440gtk/mini2440gtk/src/main_window.cc:256
#9  0xb73cdad2 in ?? () from /usr/lib/libglib-2.0.so.0
#10 0x08f48450 in ?? ()
#11 0xb7452534 in ?? () from /usr/lib/libglib-2.0.so.0
#12 0xbfde3dd8 in ?? ()
#13 0xb73cda9f in ?? () from /usr/lib/libglib-2.0.so.0
#14 0xb7856f00 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#15 0x08f1b008 in ?? ()
#16 0xbfde3e08 in ?? ()
#17 0xb73ccb5c in ?? () from /usr/lib/libglib-2.0.so.0
#18 0xb7452534 in ?? () from /usr/lib/libglib-2.0.so.0
#19 0x08f22098 in ?? ()
#20 0xbfde3df8 in ?? ()
#21 0xb7451ff4 in ?? () from /usr/lib/libglib-2.0.so.0
#22 0xbfde3e3c in ?? ()
#23 0x08f4fc00 in ?? ()
#24 0xbfde3e58 in ?? ()
#25 0xb73cd1b9 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Running the program without G_DEBUG gives:

IgorsGentooOnNetwork src # gdb mini2440gtk
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu"...
(gdb) break main_window.cc:282
Breakpoint 1 at 0x80496d4: file
/home/igor/mini2440gtk/mini2440gtk/src/main_window.cc, line 282.
(gdb) run
Starting program: /home/igor/mini2440gtk/mini2440gtk/debug/src/mini2440gtk
[Thread debugging using libthread_db enabled]
[New Thread 0xb70d6b40 (LWP 22570)]
Header is: 0 0
Header is: 27 91

(mini2440gtk:22570): GLib-GObject-WARNING **: invalid cast from
`(null)' to `GObject'

(mini2440gtk:22570): GLib-GObject-CRITICAL **: g_object_freeze_notify:
assertion `G_IS_OBJECT (object)' failed

(mini2440gtk:22570): GLib-GObject-WARNING **: invalid cast from
`(null)' to `GObject'

(mini2440gtk:22570): GLib-GObject-CRITICAL **: g_object_notify:
assertion `G_IS_OBJECT (object)' failed

(mini2440gtk:22570): GLib-GObject-WARNING **: invalid cast from
`(null)' to `GtkWidget'

(mini2440gtk:22570): Gtk-CRITICAL **: gtk_widget_queue_resize:
assertion `GTK_IS_WIDGET (widget)' failed

(mini2440gtk:22570): GLib-GObject-WARNING **: invalid cast from
`(null)' to `GObject'

(mini2440gtk:22570): GLib-GObject-CRITICAL **: g_object_thaw_notify:
assertion `G_IS_OBJECT (object)' failed
[Switching to Thread 0xb70d6b40 (LWP 22570)]

Breakpoint 1, CFrame::UpdateData (this=0x94e1450) at
/home/igor/mini2440gtk/mini2440gtk/src/main_window.cc:282
282		gtk_label_set_markup( GTK_LABEL( data2 ), m_data2->str );
(gdb) print data1
$1 = (GtkWidget *) 0x94e80b0
(gdb) print m_data1->str
$2 = (gchar *) 0x94dfee0 "<b><span foreground=\"black\"><span
font=\"Sans Serif\"><span font='48'>14.00</span></span>V</span></b>"

And here is the code for offending function:

void CFrame::UpdateData()
{
	ConvertTotalPack();
	ConvertMinimalVoltage();
	ConvertMaximumVoltage();
	SetColoring();
	gtk_label_set_markup( GTK_LABEL( data1 ), m_data1->str );
	gtk_label_set_markup( GTK_LABEL( data2 ), m_data2->str );
	gtk_label_set_markup( GTK_LABEL( data3 ), m_data3->str );
	gtk_label_set_markup( GTK_LABEL( data4 ), m_data4->str );
}

Do you see anything wrong with it?

Thank you.

>
> Yeti
>
>