Help with subclassing a RichEditCtrl

Hi folks, I could use some help.

As a side project I am trying to write a DLL that will extend the functionality of an existing application that I do not
have source code for, i.e., some autocompletion functionality, word lookup, etc.

In the actual DLL, I am going to have to inject it into the existing app and then use FindWindow or something like that
to subclass the existing RichEditCtrl.  I need to be able to process the WM_CHAR and WM_KEYDOWN messages only.

I started out by creating my own sample project using a RichEditCtrl in my project to code my object.  I've now moved
everything into the object, except for the OnChar and OnKeyDown message processing in the RichEditCtrl. 

In trying to move processing of WM_CHAR and WM_KEYDOWN message, I'm trying to subclass the RichEditCtrl's window, but
I'm having a lot of problems, getting complier or linker errors that it's not happy with the signature of my new

Here is what I'm trying:

in my class definition...

class MyObject
      OldWindowProc(HWND, UINT, WPARAM, LPARAM);

      static LRESULT CALLBACK 
      NewWindowProc(HWND hWnd, 
		    UINT uMsg, 
		    WPARAM wParam, 
		    LPARAM lParam);

...and in the declaration...

   //get the hWnd of the RichEditCtrl
   HWND hwndREC = GetRichEditHwnd(); //my own function

   //set the new window proc and store the old window proc
   OldWindowProc = (WNDPROC) (::SetWindowLong(hwndREC, GWL_WNDPROC,


.... and I will unsublass the RichEditCtrl in my object's destructor.

I've tried a bunch of permutations, but as I digressed to the point of guessing I thought I would seek a bit of advice.

Using the above, I get the following error:

D:\CPPProjects\MyObject.cpp(234) : error C2664: 'SetWindowLongA' : cannot convert parameter 3 from 'long (struct HWND__
*,unsigned int,unsigned int,long)' to 'long'
        This conversion requires a reinterpret_cast, a C-style cast or function-style cast

I'm not sure, but I thought I could use a static function of my class for the callback for the new WndProc?  I tried
defining the OldWindowProc without parameters, but then the linker complained.

I also tried using SetWindowLongPtr, tried declaring the OldWindowProc as a global, but each thing I tried resulted in
some error or another either during compilation or linking during the call to SetWindowLong.  I tried using extern "C",
but basically I don't think I understand what I'm doing.

Thanks in advance for any help/suggestions!

8/24/2004 7:34:57 PM
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