Recieve a message FROM another process.

Question

I've been teaching myself how to use messages with Window's APIs, and have actually been doing very well learning them. Problem is, I can't figure out how to receive a message from another application to start code within mine.

Essentially, what I want to do is allow others using a commercial application to click the save button (on the commercial application), and have my application stop the save message, prompt the user, and from that either cancel the save to allow them to continue, or allow the save (which I know how to do now through messages).

I just need to know how to catch a message, and stop it. If anyone can point me to an API call, or function, or just documentation that may help, please do.

Answer 1

I think you'll need to attach your own application to the running process the same way a debugger would... Unless the commercial application has a custom method of plugging into their architecture to do this.

The next question is... do you want to proceed down this path.

Answer 2

Check out Detours by Microsoft Research. It's possible, but not simple. Also, look into how client-side game cheats are performed. I will not link any of them here, but they are out there. That's essentially what you want to do.