Difference between revisions of "ERROR"
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Latest revision as of 18:04, 27 April 2020
causes a macro to terminate with an error
<text> - message to print to screen when the error occurs The ERROR command is the macro equivalent of the M.error() function that a primitive would use. Its primary function is to signal an error to the calling macro. The command simply throws a MidasException with the given message. If the macro has PROCESSEXCEPTION procedure, it can handle the exceptions on a case by case basis. If not, a message is generated, and the macro continues to execute. Examples: This example shows how a calling macro can use the TRAP command to trap an error generated by ERROR. In this case, MYMACRO wants to call FIXIT if the macro DANGEROUS has an error: -- MYMACRO.M -- mymacro a:file TRAP error handler say "Going to call %DANGEROUS." %dangerous file TRAP error off say "%DANGEROUS executed OK." STOP endmacro procedure handler m:msg say "%DANGEROUS had the problem ^msg.data" return procedure processException m:msg say "The file had better have some data elements in it." return -- END MYMACRO.M -- Switches: None See Also: PAUSE, TRAP