The C# code below, when executed, prints the following: 0x80004002 0x80004002 Who can figure out why the second line printed isn't 0x80004003 ? using System; using System.Runtime.InteropServices; public class Quiz { const int...

Whereas probes like Collected Delegate or Object Not Kept Alive catch coding mistakes in managed code, the Invalid IUnknown and Invalid VARIANT probes typically inform you when you're attempting to interoperate with a broken COM component. Either that...

The Object Not Kept Alive and Buffer Overrun probes are unlike any other CDPs, because they do not output any messages to report bugs in your code. Instead, they change general CLR behavior with the goal of forcing non-deterministic bugs that can be almost...

I'll be doing a book signing (for .NET and COM: The Complete Interoperability Guide ) at the TechEd Mall tomorrow (Wed. 6/4) from 11:30-12:30 - immediately after the Interop presentation.  If you're at TechEd, please stop by!

The most common mistake made when passing a delegate to unmanaged code (marshaled as a function pointer) is to allow the delegate to be garbage collected before unmanaged code is finished using it. This can happen because unmanaged code is invisible to...