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ERRORS
There are a number of conditions that can generate Toolkit errors.
Whenever an error occurs, the global byte variable N_Error is updated
with the error number (listed below).
The Toolkit can treat errors in one of two ways. If the global boolean
variable N_Fatal is set to true (default) then any error will be
fatal, i.e. an error message is displayed and the program halts. If
N_Fatal is set to false then the N_error variable is set but the
program continues (as best it can!) - be sure to check N_error after
every menu call if N_Fatal is false. It is recommended that the
N_fatal flag be set to true until your programs are fully tested and
debugged.
The list of error codes for N_errors are:
0 NO ERROR
1 NO MEMORY TO ADD A TOPIC
2 NO MEMORY TO SAVE THE SCREEN IMAGE
3 NO ACTIVE PICKS IN MENU
4 NOT USED
5 MENUS NESTED TOO DEEP, MODIFY MAX_LEVELS
6 TOPIC NOT DEFINED - CANNOT MODIFY IT!
7 NO DESPATCHER PROCEDURE ASSIGNED
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Written by Dave Pearson