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Asked: 2026-05-15T06:05:22+00:00

Actual question(s): What happens in Windows when a program crashes from an uncaught exception?

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Actual question(s):

What happens “in Windows” when a program crashes from an uncaught exception?

Is there a dll function, which I can hook, to log some basic information about a crash?

Context:

I am planning to write a program which will collect some very basic information about any applications which crash on my local pc. I was hoping that I could execute a simple method to log some information about a crash in a similar manner to the way Visual Studio produces a dialog offering to let you debug a program when it crashes.

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1 Answer

  1. Editorial Team

    Managed exceptions are implemented using the regular Windows Structured Exception Handling mechanisms. The exception code is 0xe0434f4d. Windows goes looking for an exception handler that’s willing to handle the exception. If the code has no active try block on the stack, or no catch block is willing to catch the managed exception then the last gasp in managed code is the AppDomain.UnhandledException event.

    If that isn’t implemented either than exception handling switches to unmanaged handling, an exception filter set with SetUnhandledExceptionFilter gets a shot. Failing that, there is always a default handler provided by Windows. In normally invokes WER, the Windows Error Reporting program. That offers the user a dialog to send the exception details to Microsoft. Don’t expect anything out of that.

    By the time it has progressed beyond AppDomain.UnhandledException all info about the managed exception is lost. No stack trace, no exception message. Just the exception code, which you already know, and an exception address, which you’ll have no use for because code is dynamically generated by the JIT compiler.

    Be sure to trap the exception in the last gasp stage, write an event handler for AppDomain.UnhandledException. Log the value of e.ExcdeptionObject.ToString() and kill the program with Environment.Exit(). Also beware the Application.ThreadException event in Windows Forms code and Dispatcher.UnhandledException event in WPF code. They are a back stop for exceptions that are raised while processing events on the UI thread.

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