Subclassing Using WTL

I'm trying to subclass an edit control using WTL. I am using this article for instruction

http://www.codeproject.com/wtl/subcl...ditcontrol.asp

So, basically, what I have, is a bunch of edit boxes that I create from a rc template, and my edit control subclass (in the article, this is CEditEnterAsTabT, in my code it's CEditArrowsT), and when I try to AttachToDlgItem (actually subclass the edit controls) in my dialogs OnInitDlg routine.

AttachToDlgItem

Code:

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        BOOL AttachToDlgItem(HWND parent, UINT dlgID)
        {
                m_dlgItem = dlgID;
                m_parent = parent;
                m_hWnd = ::GetDlgItem(parent, dlgID);
               
                return SubclassWindow(m_hWnd);
        }

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In this method, SubclassWindow in the failiure. On MSDN it comments

Quote:

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Do not call SubclassWindow if you have already called Create.

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But I don't call create, they're dialog elements programmed into the resource script. This comment is the only reason I can see for failure, is there anyway I might get around it? I might try hardcoding the edit controls into the dialog if there isn't but that seems very inconvenient.

SubclassWindow internally calls SetWindowLong API. If SetWindowLong fails you can call GetLastError to get extended error information. So try to call GetLastError.

I get error 1400 - ERROR_INVALID_WINDOW_HANDLE: Invalid window handle for each and every time I tryh it. Here is essentially the code for my dialog

Code:

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class WtlKbdCtrlsDlg :
        public CDialogImpl<WtlKbdCtrlsDlg>,
        public CDialogResize<WtlKbdCtrlsDlg>,
        public CMessageFilter
{
        WtlWindow * parent;
        CEditArrowsT<CWindow> * arr;

public:

        enum { IDD = IDD_KBDCTRLS };

        BEGIN_MSG_MAP(CAboutDlg)
                MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
                MESSAGE_HANDLER(WM_CLOSE, OnClose)
                COMMAND_ID_HANDLER(IDOK, OnOKCancel)
        END_MSG_MAP()

        virtual BOOL PreTranslateMessage(MSG * msg)
        {
                return IsDialogMessage(msg);
        }

        LRESULT OnInitDialog(UINT msg, WPARAM wparam, LPARAM lparam, BOOL & handled)
        {
                arr = new CEditArrowsT<CWindow>[16];
                for(int i = 0; i < 16; ++i)
                {
                        if(!arr[i].AttachToDlgItem(this->m_hWnd, IDC_NYAW + i))
                        {
                                DWORD err = ::GetLastError(); // Always 1400
                        }
                }

                CenterWindow();
                _Module.GetMessageLoop()->AddMessageFilter(this);

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Here;s the rest

http://zxcvbn.googlecode.com/svn/trunk/wtltrip/WtlDlg.h
http://zxcvbn.googlecode.com/svn/trunk/wtltrip/