# Optional parameter.
# The global data type.
# Must be a struct.
# Must contains only variables.
GLOBAL_DATA_TYPE      T_global_data



You can save an entire message inside global_data :
struct T_global_data
{
  ...
  hide var msg  <msg_name> = nil;
  ...
}

Then, inside a message, you can do :
struct T_my_message
{
  ...
  if (global.<msg_name> != nil)
  {
    print ("a value of a previously saved message %s", global.<msg_name>.<a_field_name>);
  }
  set  global.<msg_name> = this_msg;
}





If there is an error (which is NOT detected when reading the <file>.fdesc) inside your T_global_data,
 you will have a popup with very few information.

If you want to check more precisely your T_global_data,
 you can instantiate it inside, eg, the header,
 then the error will be displayed into detail pane.


Memory warning.
1 global data is intantiated for each packet dissected.
It could be a high memory load.

If you use this_msg, the data of the message will also be keep.
It could be a high memory load.