Subclassing Using WTL

[Calculator]

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

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

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

Do not call SubclassWindow if you have already called Create.

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.

[VictorN]

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

[Calculator]

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

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);

Here;s the rest

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