Handling the hook function

Question

I'm trying to use EasyHook in C# to properly hook into a method from a COM object (unmanaged).

I was able to determine the address of the method of the COM object and I can properly trigger my hook function. I did it this way, being the rest of the code pretty much similar to the one in the tutorial:

SendHook = LocalHook.Create(0x12345678, new DMyFunc(MyFunc_Hooked), this);

However, once inside my hook, all parameters are scrambled (they do not equal those that I'm originally passing).

Also, I'm not able to return anything (please note that I also tried hooking another function that returns a short and the value doesn't properly return).

When I open eXescope, this is one of the function signatures:

function MyFunc(out ParamA:^BSTR; out ParamB:^bool): ^TypeA;

And this function has the following signature when I use the COM object normally in C#:

TypeA MyFunc(ref string ParamA, ref bool ParamB);

Any ideas? Thanks in advance!

Answer 1

I managed to solve the problem in 5 minutes after reading the article provided by Dark Falcon. I totally recommend reading it! Therefore, all credit for the answer goes to him!