Can't catch long integer exceptions

I just tried to catch range error exceptions with LongWord and Int64, and I
can't seem to catch them properly with try..except.

When a Longword variable has value zero (the smallest possible), and inside
a try..except structure I try to decrement it below zero, the except clause
executes but the exception is not disabled, so an exception is raised
*again* just outside the try..except. I did find a workaround for this, to
avoid the exception being re-raised.

But for this next example I can find no workaround. When an Int64 variable
has its smallest possible value Low(Int64) and I try to decrement it lower
inside a try..except, an exception is raised that simply will not be
disabled. The same happens if I try to increment High(Int64).

Can anyone explain what is happening and how I can catch and these
exceptions without them being re-raised?

Rory Daulton
rorydaultonemail.com

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