CODEWITHSUNDEEP
c++winapiexceptiondll-injection
uber
uber

Reputation: 11

How to catch EVERY exception in C++/Windows?

I have a DLL that's being injected into very old, buggy and now unsupported by it's developer application. Sometimes that application crashes, and I need some way to catch literally all unhandled exceptions (from DLL) that may occur to save data and only then allow the app to crash. How can I achieve that?

For now, there is an external debugger for that purpose, but it's just too slow and also buggy to keep it that way.

Upvotes: 1

Views: 444

Answers (1)

Billy ONeal
Billy ONeal

Reputation: 106530

You have to start a new process which hosts the DLL. If the DLL is going to crash, it's going to bring down the process, whether you like it or not. Sure, you could attempt to catch an exception or something like that, but if the exception is being thrown, that means memory is corrupted. It is better to crash catastrophically than to have the program continuing to run in an inconsistent state.

The windows shell is a program which actually does this -- it launches some plugins in a surrogate process, so that if the plugin crashes, it doesn't bring down the whole shell. You'd need to use interprocess communication to communicate between yourself and the surrogate you start.

Upvotes: 9

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