How does this help catch multiple exceptions in one line as the question requires? } catch (overflowexception) { webid = guid.empty; Note that most crashes are not caused by exceptions in c++.
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} catch (formatexception) { webid = guid.empty; You can catch all exceptions, but that won't prevent many crashes. I think that this only works if you raise and then catch the exception, but not if you try getting the traceback before raising an exception object that.
Try { webid = new guid(querystring[web]);
