Re: Parameter passing and gpointers...

[Luciano Chavez <lnx1138 us ibm com>]

On Tue, 2001-11-13 at 12:25, Chris Elston wrote:
> 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;
>       .....

I hope that you've done a 
        my_struct = g_malloc (sizeof (struct MyStruct));
        here, right?
>       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?

What exactly are the compile error messages?

Alternatively,if there are only two widgets in some common ancestry then
you could bind them to that ancestor by name and retrieve them using the
gtk_object_set_data() and gtk_object_get_data() functions.

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

Luciano Chavez

lnx1138 us ibm com          
http://sf.net/projects/evms