Catch c++ Access Violation exception

Question

A c++ access violation error gets thrown at some part of my code. I would like to "catch" it and log the faulting line so I can investigate further. I tried the first answer in this thread: Catching access violation exceptions?

Unfortunately no luck so far. I am using debug mode in Visual Studio 2019. Anyone knows a way how to log the faulting line?

Answer 1

On Windows, you can do it with __try ... __except, as in the following simplified example:

__try
{
    * (int *) 0 = 0;
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
    std::cout << "Exception caught\n";
}

Microsoft call this mechanism 'structured exception handling' and it is much more powerful (and, indeed, usable) than signals on Unix and I encourage you to learn more about it if you want to do this kind of thing:

https://learn.microsoft.com/en-us/cpp/cpp/try-except-statement?view=msvc-170

I use it to catch exceptions in poorly behaved ASIO drivers which would otherwise crash my app.