Win32：即给编辑框添加新窗口过程，也保留原来的窗口过程属性

WNDPROC wpOrigEditProc;

LRESULT APIENTRY EditBoxProc(
    HWND hwndDlg,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam)
{
    HWND hwndEdit;

    switch(uMsg)
    {
        case WM_INITDIALOG:
            // Retrieve the handle to the edit control.
            hwndEdit = GetDlgItem(hwndDlg, ID_EDIT);

            // Subclass the edit control.
            wpOrigEditProc = (WNDPROC) SetWindowLong(hwndEdit,
                GWL_WNDPROC, (LONG) EditSubclassProc);
            //
            // Continue the initialization procedure.
            //
            return TRUE;

        case WM_DESTROY:
            // Remove the subclass from the edit control.
            SetWindowLong(hwndEdit, GWL_WNDPROC,
                (LONG) wpOrigEditProc);
            //
            // Continue the cleanup procedure.
            //
            break;
    }
    return FALSE;
        UNREFERENCED_PARAMETER(lParam);
}

// Subclass procedure
LRESULT APIENTRY EditSubclassProc(
    HWND hwnd,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam)
{
    if (uMsg == WM_GETDLGCODE)
        return DLGC_WANTALLKEYS;

    return CallWindowProc(wpOrigEditProc, hwnd, uMsg,
        wParam, lParam);
}