An unhandled exception can occur under the following conditions:

• An error that occurred or exception that was thrown in a TRY, CATCH, or FINALLY block was not caught by a structured error handler such as TRY...CATCH...FINALLY.
  
  
• A structured error handler did not catch a thrown exception that occured outside a TRY...CATCH...FINALLY structure.
  
  

You can catch an unhandled structured exception using the following unstructured exception handlers:

• ON ERROR Command
  
  
• Error Event
  
  
• Visual FoxPro system handler
  
  

For each of these error handlers, the error number returned by the ERROR(В ) function is 2059. Visual FoxPro provides details about the original error. You can also obtain additional information about the original error that caused the unhandled exception from the SYS(2018) - Error Message Parameter, MESSAGE(В ), and AERROR(В ) functions. The SYS(2018) function returns the same value as the third element in the array returned by the AERROR(В ) function. The MESSAGE(В ) function returns the same value as the second element in the array returned by AERROR(В ).

If the unhandled exception was caused by a THROW statement, the value of SYS(2018) is 2071, or User Thrown Error.

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