Causes the Gosub at label to be executed when a runtime error occurs. Program control may be resumed at the next statement with a Return statement in the subroutine. Error traps are kept in a stack so that the last defined trap, that has not been removed with an OffError will be the active one.
You may not execute an OnError statement inside a Try / Catch / End Try statement.
# test error trapping onerror nicetrap print 1 next haha print 2 open 999, "bogus.file" print "Runs Anyway" # test error trapping off and fail at any error (default) offerror print 3 next hoho print "never get here" end nicetrap: # this is the nice error handler print "trap and run - error on line " + lasterrorline + " - error number " + lasterror + " message " + lasterrormessage + " (" + lasterrorextra + ")" return
1 trap and run - error on line 4 - error number 4 message Next without FOR () 2 trap and run - error on line 6 - error number 5 message Invalid File Number () Runs Anyway 3 ERROR on line 12: Next without FOR
See additional example of usage on ThrowError page.
|0.9.6z||New To Version|
|18.104.22.168||Removed the ability to use a subroutine for error trapping|