Getting WndProc

I'm trying to get WindowProc from another window, and set my WindowProc to it. I use:

Code:

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LRESULT CALLBACK Proc1(HWND, UINT, LPARAM, WPARAM); // or WPARAM, LPARAM, I can't remember what order
LRESULT CALLBACK Proc2(HWND, UINT, LPARAM, WPARAM);
...
Proc1 = (LRESULT CALLBACK) SetWindowLong(hwnd, SWL_WNDPROC, Proc2);

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but it gives me an LVALUE needed error message. can someone help me out?

Code:

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//here is the code to swap it with one from the other window:
...

        WNDPROC theOtherWndProc = (WNDPROC)GetWindowLong(hwndOther, GWL_WNDPROC);
        WNDPROC yourOldWndProc = (WNDPROC)SetWindowLong(hwndYour, GWL_WNDPROC, (DWORD)theOtherWndProc);
...

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is it clear?

ok, that seemed to work, but I'm making it in my WM_CREATE message and I get an Error on case WM_LBUTTONDOWN: (my next message handler) that says "case bypasses initialization of local variable"

scratch that, i got it to work.