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IDebugStackFrame3

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This interface extends IDebugStackFrame2 to handle intercepted exceptions.

Syntax

IDebugStackFrame3 : IDebugStackFrame2

Notes for Implementers

The debug engine (DE) implements this interface on the same object that implements the IDebugStackFrame2 interface to support intercepted exceptions.

Notes for Callers

Call QueryInterface on an IDebugStackFrame2 interface to obtain this interface.

Methods in Vtable Order

In addition to the methods inherited from IDebugStackFrame2, IDebugStackFrame3 exposes the following methods.

Method Description
InterceptCurrentException Handles an exception for the current stack frame before any regular exception handling.
GetUnwindCodeContext Returns a code context if a stack unwind were to occur.

Remarks

An intercepted exception means that a debugger can process an exception before any normal exception handling routines are called by the run time. Intercepting an exception essentially means making the run time pretend that there's an exception handler present even when there's not.

  • InterceptCurrentException is called during all normal exception callback events (the only exception to this is if you're debugging mixed-mode code (managed and unmanaged code), in which case the exception can't be intercepted during the last-chance callback). If the DE doesn't implement IDebugStackFrame3, or the DE returns an error from IDebugStackFrame3::InterceptCurrentException (such as E_NOTIMPL), then the debugger will handle the exception normally.

By intercepting an exception, the debugger can allow the user to make changes to the state of the program being debugged and then resume execution at the point where the exception was thrown.

Note

Intercepted exceptions are allowed only in managed code, that is, in a program that's running under the Common Language Runtime (CLR).

A debug engine indicates that it supports intercepting exceptions by setting "metricExceptions" to a value of 1 at run time by using the SetMetric function. For more information, see SDK Helpers for Debugging.

Requirements

Header: msdbg.h

Namespace: Microsoft.VisualStudio.Debugger.Interop

Assembly: Microsoft.VisualStudio.Debugger.Interop.dll

See also