Qt: Catch application crash and display custom window

Question

I'd like our application to have a special window that catches crashes. Such window would have the ability to electronically send us the stack trace (on Mac), or the .dmp files on windows.

I can handle the window and its internal functionality -- but how does one catch an application crash in time to gracefully display a custom window?

I'm with Qt 4.8.5

Answer 1

First - with crash I understand things like access violation, division by 0 etc., not exceptions that you throw yourself - these can be handled with implementing QApplication::notify. If you need platform independent solution then i guess you would have to make a wrapper for the functionality on each platform:

• Un Linux, Mac, install a signal handler and show the window from there displaying maybe some optional signal info etc.

• On Windows I guess you could wrap everything with

  __try { ... } __except { ... }

Maybe you can subclass the QApplication and in your class actually handle the signal handler installation / add try-except handlers (depending on the platform) and then call some generic method where you do all setup and begin the event loop. That is just my two cents.

Answer 2

Working with Qt 4 years ago, I was in need of the same functionality.

Don't reinvent the wheel. I used Crashrpt with success. Comes with much needed features for user support.

https://code.google.com/p/crashrpt/