Parameter passing and gpointers...

[Chris Elston <celston corky sapien net>]

Ok, some of you may recall that a few months ago I sent a question talking
about sending multiple params to a signal handler.  One suggestion was
thru using a struct and passing a reference to that struct.  This is
giving me some problems and I'm not sure why.  I only have so much
experience in C so that may be what's wrong.  Here's an example of what
I'm trying to do:

struct MyStruct {
        GtkWidget *entry1;
        GtkWidget *entry2;
}

void create_dialog( void ) {
        struct MyStruct *my_struct;
        .....
        my_struct->entry1 = gtk_entry_new();
        my_struct->entry2 = gtk_entry_new();
        .....
        gtk_signal_connect(
                GTK_OBJECT(some_button), "clicked",
                GTK_SIGNAL_FUNC(my_callback),
                (gpointer) my_struct
        );
        .....
}

void my_callback( GtkWidget *w, gpointer data ) {
        struct MyStruct *local_struct = (struct MyStruct *) data;
        char* some_text = gtk_entry_get_text(
                GTK_ENTRY(local_struct->entry1)
        );
        .....
}


I'm getting all sorts of compile errors trying the above.  I've also tried
to use different pointer syntax but to no avail.  What am I doing wrong?
What do you usually do in this situation?  Are malloc and free necessary
for what I'm doing?

-- 

Chris Elston
celston corky sapien net
---------------------------------
Nucleus Communications
Web Script Programmer