Hi guys,

I have a problem with some legacy software I am working on. Existing there is an .exe which calls a form in a .dll (passing a reference to itself as an argument), the .dll then calls back to the .exe. My problem is that I am writing a replacement for the .exe... I can call and run the form on the .dll OK, but I do not know the names of the functions (or arguments etc) in the original .exe that the dll uses to call back. The exe does not show any interface using VB6 object inspector. I do have a rough idea of what the effects of the callbacks should be. The original documentation and source for both the exe and dll are lost. Any pointers?

Cheers, Andy

Regards, Andy

You could try to tap into the Windows Messaging system, to try to find out what the system messages were that were used to invoke the call(s). (Tough go, that one though.)
There are tools available for this. Once you start logging messages though, you see a message for every action—mouse moves, clicks, programs initiating actions, ad ininitim.