BlitzMax provides a mechanism for handling runtime errors known as exception handling.
Function ExTest() Throw "Bingo!" End Function Try ExTest() Catch ex:Object Print ex.ToString() End Try
Throwing an exception causes the program to jump to the most recent Catch block. You can provide multiple catch blocks for catching exceptions of different types. If there is no appropriate Catch block for the exception, then the program jumps to the %next most recent Catch block. If no catch block can be found to deal with the exception, the program will end.
BlitzMax has several built-in exception types, all of which extend type TBlitzException. These are:
|TNullMethodException||Thrown when a program attempts to call an abstract method.|
|TNullFunctionException||Thrown when a program attempts to call a null function.|
|TNullObjectException||Thrown when a program attempts to access a null object (only thrown in debug mode).|
|TArrayBoundsException||Thrown when a program attempts to access an array element outside of an array's bounds (only thrown in debug mode).|
|TRuntimeException||Thrown by the RuntimeError or Assert commands.|