Re: Throwing exception accross C callback

Hi all,

I'm trying to do something which may not be possible but here goes.

My C++ program uses a C library (libssh2, in case you care) for part of
it's functionality. For certain operations, the library requires me to
pass it a callback function which it can then invoke. I do this by
passing a static method of one of my C++ classes which is passed a
pointer to 'this' when it is called. Up to now, all fairly standard
stuff.

The problem is, I would like my callback function to be able to throw
exceptions. The C library doesn't need to understand them; just to pass
them up to the calling C++ code. So the execution chain looks like this:

C++ class -------> C library ---(callback)---> C++ c/b method

The callback method would throw an exception which would be called in the
C++ code that invoked the library function.

Is this possible? I've tried it and the exception is caught but various
stack objects are not destructed correctly. I'm not willing to use this
unless it's safe. Is there a correct way to do this.

I'm using Visual Studio 2005 under Windows XP.