The only way in code (i.e. not using a debugger) to get information from an exception in a catch(...) block is to rethrow the exception, and catch it with specific clauses.
For example.
try
{
// code that might throw something
}
catch (...)
{
try_to_interpret_exception();
}
void try_to_interpret_exception() // we assume an exception is active
{
try
{
throw; // rethrow the exception. Calls terminate() if no exception active
}
catch (std::exception &)
{
// handle all exception types derived from std::exception
// this covers all exceptions that might be thrown by
// the standard C++ library
}
catch (specific_exception &e1)
{
// handle all exception types derived from specific_exception
}
catch (another_specific_exception &e2)
{
// etc
}
}
The catch (so to speak) of this approach is that it requires the programmer to have some knowledge of what the exception might be (e.g. from documentation of a third party library).
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