en:onerror
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en:onerror [2016/08/15 04:40] admin |
en:onerror [2020/02/28 10:46] |
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| - | ===== OnError (Statement) ===== | ||
| - | |||
| - | ==== Format ==== | ||
| - | **onerror** [[labelprogramsyntax|label]] | ||
| - | |||
| - | ==== Description ==== | ||
| - | Causes the [[GosubReturn|Gosub]] at [[labelprogramsyntax|label]] to be executed when a runtime error occurs. | ||
| - | |||
| - | You may not execute an OnError statement inside a [[Try|Try / Catch / End Try]] statement. | ||
| - | |||
| - | ==== Example ==== | ||
| - | |||
| - | < | ||
| - | # test error trapping | ||
| - | onerror nicetrap | ||
| - | print 1 | ||
| - | next haha | ||
| - | print 2 | ||
| - | open 999, " | ||
| - | 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 | ||
| - | </ | ||
| - | will display\\ | ||
| - | < | ||
| - | 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|ThrowError]] page. | ||
| - | |||
| - | ==== See Also ==== | ||
| - | {{page> | ||
| - | |||
| - | ==== History ==== | ||
| - | |0.9.6z|New To Version| | ||
| - | |1.99.99.33|Removed the ability to use a subroutine for error trapping| | ||
en/onerror.txt ยท Last modified: 2020/02/28 10:46 (external edit)
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