Re: GtkFileChooser with preview image problems

["Dmitry M. Shatrov" <zzidre mail ru>]

This code is OK. I've copy-pasted and compiled it, image previewing 
works fine and there's NO warning about 'finished-loading' signal. Check 
you libraries installation!

You should ask you question to gtk-list gnome org - it is for 
general-purpose gtk+ questions

Dmitry

Andreas Volz wrote:

> Hi,
>
> I try to change my application from GtkFileSelection to GtkFileChooser
> with preview image. So I took the example code from the API docs and
> build an simple example. The Chooser works, but if I try to preview a
> picture the example froze. Perhaps someone has a better example or knows
> where's the problem in my example?
>
> This warning is printed if starting the sample:
> (GtkFileChooser:7424): GLib-GObject-WARNING **: gsignal.c:2267: 
> signal name `finished-loading' is invalid for instance `0x815ece0
>
> If I try to debug the sample no windows are opened and gdb prints:
> (gdb) run
> Starting program: /home/andreas/src/gtk/beispiele/GtkFileChooser/GtkFileChooser 
> warning: Unable to find dynamic linker breakpoint function.
> GDB will be unable to debug shared library initializers
> and track explicitly loaded dynamic code.
>
> Program received signal SIG32, Real-time event 32.
> 0x40c50984 in ?? ()
> (gdb) bt
> #0  0x40c50984 in ?? ()
> #1  0xbfffe478 in ?? ()
> #2  0x40c507c9 in ?? ()
> #3  0xbfffe3e0 in ?? ()
> #4  0x00000020 in ?? ()
> #5  0xbfffe3e0 in ?? ()
> #6  0x404f9e7d in vfprintf () from /lib/libc.so.6
> Previous frame inner to this frame (corrupt stack?)
>
> Here is my broken example code:
>
> #include <gtk/gtk.h>
>
> static void
> update_preview_cb (GtkFileChooser *file_chooser, gpointer data)
> {
>  GtkWidget *preview;
>  char *filename;
>  GdkPixbuf *pixbuf;
>  gboolean have_preview;
>
>  preview = GTK_WIDGET (data);
>  filename = gtk_file_chooser_get_preview_filename (file_chooser);
>
>  pixbuf = gdk_pixbuf_new_from_file_at_size (filename, 128, 128, NULL);
>  have_preview = (pixbuf != NULL);
>  g_free (filename);
>
>  gtk_image_set_from_pixbuf (GTK_IMAGE (preview), pixbuf);
>  if (pixbuf)
>    gdk_pixbuf_unref (pixbuf);
>
>  gtk_file_chooser_set_preview_widget_active (file_chooser, have_preview);
> }
>
>
> int
> main (int argc, char *argv[])
> {
>  GtkWidget *dialog;
>  GtkWidget *window;
>  GtkWidget *preview;
>
>  gtk_init (&argc, &argv);
>  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>  gtk_widget_show (window);
>  
>  dialog = gtk_file_chooser_dialog_new ("Open File",
>                                        GTK_WINDOW (window),
>                                        GTK_FILE_CHOOSER_ACTION_OPEN,
>                                        GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
>                                        GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
>                                        NULL);
>
>  preview = gtk_image_new ();
>
>  gtk_file_chooser_set_preview_widget (GTK_FILE_CHOOSER (dialog), preview);
>  g_signal_connect (GTK_FILE_CHOOSER (dialog), "update-preview",
> 		    G_CALLBACK (update_preview_cb), preview);
>
>  if (gtk_dialog_run (GTK_DIALOG (dialog)) == GTK_RESPONSE_ACCEPT)
>  {
>    char *filename;
>
>    filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (dialog));
>    //open_file (filename);
>    g_free (filename);
>  }
>
>  gtk_widget_destroy (dialog);
>  gtk_main ();
>
>  return 0;
> }
>
> Sorry that I write to this devel-list, but no one answered on the app-devel-list
> and I wasn't able to find a working GtkFileChooser with preview image sample code.
>
> So if this isn't a gtk bug (I don't think so), could you help mo to get this 
> example working?
>
> regards
> Andreas
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>
>
>