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If my C++ app crashes on Windows I want to send useful debugging information to our server.
On Linux I would use the GNU backtrace() function – is there an equivalent for Windows?
Is there a way to extract useful debugging information after a program has crashed? Or only from within the process?
(Advice along the lines of “test you app so it doesn’t crash” is not helpful! – all non-trivial programs will have bugs)
The function Stackwalk64 can be used to snap a stack trace on Windows.
If you intend to use this function, you should be sure to compile your code with FPO disabled – without symbols, StackWalk64 won’t be able to properly walk FPO’d frames.
You can get some code running in process at the time of the crash via a top-level
__try/__exceptblock by calling SetUnhandledExceptionFilter. This is a bit unreliable since it requires you to have code running inside a crashed process.Alternatively, you can just the built-in Windows Error Reporting to collect crash data. This is more reliable, since it doesn’t require you to add code running inside the compromised, crashed process. The only cost is to get a code-signing certificate, since you must submit a signed binary to the service. https://sysdev.microsoft.com/en-US/Hardware/signup/ has more details.