Helmethead wrote:
> On Wed, Apr 25, 2001 at 11:58:36PM -0400, Glitch wrote:
>
>> hello,
>>
>> I got Developing Linux Applications Using GTK+ (written by Eric Harlow).
>>
>> In it there is an example of a Gtk Tree and Gtk List. It basically uses
>> the directories and files in the CWD and displays the contents in a tree
>> with leafs.
>>
>> I can get the application to compile just fine however when I try
>> selecting a directory or file I get a seg fault. I can hit the + or -
>> sign to expand or collapse a branch but selecting anything but the top
>> node causes a seg fault. Here is the actual message:
>>
>> Gtk-WARNING **: invalid cast from `(unknown)' to `GtkList'
>> Segmentation fault
>>
>
>
> Such errors usually happen when u pass a NULL to a gtk_list_* function that doesn't
>want a NULL
> Do you know that (as of gtk2.0) GtkList is by twice obselete? use GtkCList
>ferchrissakes, or if you are writing for 2.0, GtkTreeView/GtkListStore :)
>
> Course I don't know how to write for any of the above. Maybe GtkList is easier or
>something. And you do have a book on it. But it's gone way out of favor..
well, i haven't installed 2.0 and so i'm working with old code, and
since im learning *and* learning from a now old book, i feel in some
ways i should stick to the old code then since the book uses that.
anyway, I looked thru my code and didn't seee any explicit use of NULL
but I know that it isn't necessarily that easy of a fix. After looking
at my code and what is printed to the xterm i noticed that a sprintf
statement i have isnt being reached so the program must stop somewhere
before that. The sprintf statement is on line 59. I think my cast of
GTK_LIST(listbox) in the PopulateListbox function isn't working right
for some reason, but I could be wrong.
If anyone would be so kind to look at my code (all 178) lines i'd be
very grateful.
#define MAX_PATH 5000
gint CloseAppWindow (GtkWidget *widget, gpointer gdata)
{
g_print ("Quitting...\n");
gtk_main_quit();
return(FALSE);
}
void AddListItem (GtkWidget *listbox, char *sText)
{
GtkWidget *item;
item = gtk_list_item_new_with_label(sText);
gtk_container_add(GTK_CONTAINER(listbox), item);
gtk_widget_show(item);
}
int IsDirectory(char *buffer)
{
struct stat buf;
if (stat (buffer, &buf) < 0)
{
return (FALSE);
}
return (S_ISDIR(buf.st_mode));
}
static void PopulateListbox(char *szPath)
{
GtkWidget *listbox;
GtkWidget *item;
DIR *directory;
struct dirent *dirEntry;
struct stat fileStatus;
char buffer[MAX_PATH];
gtk_list_clear_items(GTK_LIST(listbox),
0,
g_list_length(GTK_LIST(listbox)->children));
directory = opendir(szPath);
while (dirEntry == readdir(directory))
{
if (!strcmp(dirEntry->d_name, "..") ||
!strcmp(dirEntry->d_name, ".")) {
}
else {
sprintf(buffer, "%s/%s", szPath, dirEntry->d_name);
if (!IsDirectory(buffer)) {
item = gtk_list_item_new_with_label(dirEntry->d_name);
gtk_container_add(GTK_CONTAINER(listbox), item);
gtk_widget_show(item);
AddListItem(listbox, dirEntry->d_name);
}
}
}
closedir(directory);
}
void select_item (GtkWidget *widget, gpointer data)
{
printf("item selected %s\n", (char *) data);
PopulateListbox((char *) data);
}
static void CreateSubTree(char *szPath, char *szDir, GtkWidget* item)
{
DIR *directory;
struct dirent *dirEntry;
struct stat fileStatus;
GtkWidget *item_subtree = NULL;
GtkWidget *item_new;
char buffer[MAX_PATH];
int nSubDirectories =0;
directory = opendir (szPath);
while (dirEntry = readdir(directory))
{
if (!strcmp (dirEntry->d_name, "..") ||
!strcmp (dirEntry->d_name, "."))
{}
else
{
sprintf(buffer, "%s/%s", szPath, dirEntry->d_name);
if(IsDirectory(buffer))
{
if (item_subtree == NULL)
{
item_subtree = gtk_tree_new();
gtk_tree_item_set_subtree(GTK_TREE_ITEM(item), item_subtree);
}
item_new = gtk_tree_item_new_with_label(dirEntry->d_name);
gtk_tree_append(GTK_TREE(item_subtree), item_new);
CreateSubTree(buffer, dirEntry->d_name, item_new);
gtk_widget_show(item_new);
gtk_signal_connect(GTK_OBJECT(item_new), "select",
GTK_SIGNAL_FUNC(select_item),
g_strdup(buffer));
}
}
}
closedir(directory);
gtk_widget_show(item);
}
static void CreateTree (GtkWidget *window)
{
char buffer[MAX_PATH];
GtkWidget *box1;
GtkWidget *scrolled_win;
GtkWidget *tree;
GtkWidget *listbox;
GtkWidget *leaf;
GtkWidget *item1, *item2, *item3;
GtkWidget *tree1, *tree2, *tree3;
GtkWidget *item;
box1=gtk_hbox_new(FALSE, 0);
gtk_container_add(GTK_CONTAINER(window), box1);
gtk_widget_show(box1);
scrolled_win = gtk_scrolled_window_new(NULL, NULL);
gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolled_win),
GTK_POLICY_AUTOMATIC,
GTK_POLICY_AUTOMATIC);
gtk_box_pack_start(GTK_BOX(box1), scrolled_win, TRUE, TRUE, 0);
gtk_widget_set_usize(scrolled_win, 450, 450);
gtk_widget_show(scrolled_win);
tree = gtk_tree_new();
listbox = gtk_list_new();
gtk_widget_set_usize(listbox, 450,450);
gtk_box_pack_start(GTK_BOX(box1), listbox, TRUE, TRUE, 0);
gtk_widget_show(listbox);
gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(scrolled_win),
tree);
gtk_widget_show(tree);
leaf= gtk_tree_item_new_with_label(getcwd(buffer, sizeof(buffer)));
gtk_tree_append(GTK_TREE(tree), leaf);
gtk_widget_show(leaf);
CreateSubTree(getcwd(buffer, sizeof(buffer)),
getcwd(buffer, sizeof(buffer)), leaf);
gtk_widget_show(window);
}
int main(int argc, char *argv[])
{
GtkWidget *window;
GtkWidget *table;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "Files using trees");
gtk_widget_set_usize(window, 450, 450);
gtk_signal_connect(GTK_OBJECT(window), "delete_event",
GTK_SIGNAL_FUNC(CloseAppWindow), NULL);
gtk_widget_show(window);
CreateTree(window);
gtk_main();
exit(0);
}
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