RE: problem: gtk_image gives critical error
- From: "Sailaxmi korada " <sai korada xilinx com>
- To: "'Deependra Shekhawat'" <openbysource yahoo co in>, "'Gtk developers'" <gtk-app-devel-list gnome org>
- Cc:
- Subject: RE: problem: gtk_image gives critical error
- Date: Tue, 18 Apr 2006 16:54:52 +0530
void on_butt_clicked(GtkButton *button,gpointer
data)
{
struct splash *ptr;
ptr= malloc(sizeof(splash));
ptr = data;
}
g_signal_connect(G_OBJECT(button1),
"clicked",
G_CALLBACK(on_butt_clicked),
(gpointer) p);
Try doing in the above fashion, it should solve your problem
-----Original Message-----
From: gtk-app-devel-list-bounces gnome org
[mailto:gtk-app-devel-list-bounces gnome org] On Behalf Of Deependra
Shekhawat
Sent: Tuesday, April 18, 2006 4:24 PM
To: Gtk developers
Subject: Re: problem: gtk_image gives critical error
Dear,
When I print the address of p in the funcl it prints a
address.
In the callback function it also prints the same for
ptr.
Then what's the problem.
Also I use structures to pass data all the time to
the callback function then there's no error but with
this image widget there seems any problem.
Please clarify if I have any alternatives
Regards
--- "David Necas (Yeti)" <yeti physics muni cz> wrote:
On Tue, Apr 18, 2006 at 03:05:51AM -0700, Deependra
Shekhawat wrote:
Hello friends,
This is my code:
struct splash
{
GtkWidget *splash_image;
};
void func1(void)
{
GtkWidget *img;
struct splash p;
This structure is created on stack and exists only
until the
function func1 exits.
img=gtk_image_new();
p.splash_image=img;
g_signal_connect(G_OBJECT(button1),
"clicked",
G_CALLBACK(on_butt_clicked),
(gpointer) &p);
Therefore &p becomes invalid immediately after you
pass it
to g_signal_connect().
}
void on_butt_clicked(GtkButton *button,gpointer
data)
{
struct splash *ptr;
ptr=(struct splash *)data;
//some code is here
//following line gives error at execution time.
gtk_image_set_from_pixbuf(GTK_IMAGE((GtkWidget*)ptr->splash_image),buffer);
}
Error is:
(splash_screen:3549): Gtk-CRITICAL **: file
gtkimage.c: line 772 (gtk_image_set_from_pixbuf):
assertion `GTK_IS_IMAGE (image)' failed
So, you are accessing some random piece of stack
here.
Yeti
--
That's enough.
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