Creating a new preference

Question

I am trying to create a new preference under Edit -> Preferences -> User Interface. I can create the text field, but when I fill it with text nothing else happens. When I click apply or ok, and reopen the window, the text is gone. When I grep through the .wireshark/preferences file, I don't see the value I entered.

I have made the following changes to ui/gtk/prefs_gui.c

 #define GUI_MYTEST_DIR_KEY     "path_directory"
...
 GtkWidget *my_test_path_te;
...
    /* Testing my text edit preference */
    my_test_path_te = create_preference_entry(main_grid, pos++,
        "My Test Path:",
        "The Location of something I want.",
        prefs.mypath_dir); //created this variable in prefs.h
    g_object_set_data(G_OBJECT(main_vb), GUI_MYTEST_DIR_KEY, my_test_path_te);
...
    prefs.mypath_dir = g_strdup(gtk_entry_get_text(
          GTK_ENTRY(g_object_get_data(G_OBJECT(w), GUI_MYTEST_DIR_KEY))));

Did I miss something with what I tried? My ultimate goal is to have the new preference pass in a string that will be sent to a few different dissectors.

Accepted Answer

Had to play with the code a while, but I finally figured it out.

Here is the list of changes I had to make to get it to write to file and show up in the GUI.

epan/prefs.h in e_prefs add:

  gchar       *mypath_dir;

epan/prefs.c

prefs_register_directory_preference(gui_module, "mytest.dir", "New Test",
        "This test better work", (const char **)&prefs.mypath_dir);

ui/gtk/pref_gui.c

static gboolean mytest_changed_cb(GtkWidget *myentry _U_, GdkEvent *event _U_, gpointer parent_w);
...
#define GUI_MYTEST_DIR_KEY      "path_directory"
...

within gui_prefs_show() GtkWidget *my_test_path_te;

...
    my_test_path_te = create_preference_entry(main_grid, pos++,
        "My Test Path:",
        "The Location of something I want.",
        prefs.mypath_dir);
    g_object_set_data(G_OBJECT(main_vb), GUI_MYTEST_DIR_KEY, my_test_path_te);
    g_signal_connect(my_test_path_te, "focus_out_event", G_CALLBACK(mytest_changed_cb), main_vb);
    printf("my new function", prefs.mypath_dir);

within gui_prefs_fetch():

prefs.mypath_dir = g_strdup(gtk_entry_get_text(
              GTK_ENTRY(g_object_get_data(G_OBJECT(w), GUI_MYTEST_DIR_KEY))));
static gboolean
mytest_changed_cb(GtkWidget *recent_files_entry U,
GdkEvent *event U, gpointer parent_w)
{
GtkWidget   *recent_files_count_te;
gchar * newval;
recent_files_count_te = (GtkWidget *)g_object_get_data(G_OBJECT(parent_w), GUI_MYTEST_DIR_KEY);

strlen(gtk_entry_get_text (GTK_ENTRY(recent_files_count_te)));
newval = gtk_entry_get_text (GTK_ENTRY(recent_files_count_te));

prefs.mypath_dir = newval;

return FALSE;

}