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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,

Posted 8-Mar-11 1:24am
Edited 8-Mar-11 1:27am

1 solution

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Solution 1

This may be of help: Inject My DLL Into a Process[^]
Jibrohni at 8-Mar-11 10:30am
Thanks. C++ looks so scary compared to C#!

So in my dll would I just want to copy the example you provided but change WM_KILLFOCUS for WM_PAINT?
SAKryukov at 8-Mar-11 14:45pm
Probably designed to be scary :-)
SAKryukov at 8-Mar-11 14:46pm
Interesting reference, my 5.

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