Written July 2020
ON ERROR GOTO <label>
ON ERROR GOTO
ON ERROR GOTO establishes the specified label as an error trap, such that the runtime system redirects to that location when an ASB error is detected. The error trap routine should then handle any appropriate error recovery activities such as logging, reporting and/or determining what to do next. In order to clear the error and resume operation of the program, see the RESUME statement.
ON ERROR GOTO without any label effectively disables the error trap. When there is no error defined, the default response to an error is to abort the program and output a message to the screen giving the error number, last file, and last location.
Example
ON ERROR GOTO TRAP
...
START:
...
TRAP:
? "Error ";ERR(0)
IF ERR(0) = 1 THEN ! if ^C ...
RESUME START ! resume at START label
ELSE
CHAIN "MAIN" ! else chain to main menu
ENDIF
See Also
| • | ERR function |
| • | Error Trapping in SBX routines |
