external process dll injection for intercepting WM's

Jibrohni asked:

Hi all,

I'm after some guidance on the above subject. I'm trying to intercept the chat messages of a 3rd party process as the messages are painted to the screen.

As I understand it I need to create a custom dll that overrides the WndProc function of the target process, that in turn handles the messages.

Please correct me if I'mn wrong here!

I suspect the dll I write must be written in C++, but the injection process can be done via C++ or C#. (I develop using C# mainly).

What is the format of the code I should inject if I'm to override the WndProc()? Do I just create a dll with an override for that function?

If someone could put this process into broad steps I'd be very grateful as I don't think I totally grasp the steps I need to follow.

Much appreciated,

Jib.

Tags: C++, C#

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