Inconsistency(gtk_object_set_data)?

[George Deprez <deprez seas smu edu>]

Hello all,

Below I have two gtk_object_set_datas.
I can't figure out why the first works and not the second.

void
on_PE_NewProtocol_button_clicked       (GtkButton       *button,
                                        gpointer         user_data)
{
  GtkWidget* Canvas;
  gint State_Count = 0;
  gfloat Zoom = 1.0;

  Canvas = lookup_widget ( GTK_WIDGET ( button ) , "PE_PView_canvas" );

  gtk_object_set_data ( GTK_OBJECT ( Canvas ) , "state_count" ,  ( gint*
) ( gint ) State_Count );
  gtk_object_set_data ( GTK_OBJECT ( Canvas ) , "zoom" ,  ( gfloat*
)(gfloat)  Zoom );
    . . .
}

What am I missing?

Thanks,
George.