VISUAL C+ CEdit设置

void CAutoScrollEditDlg::OnAuto() 
{
    // TODO: Add your control notification handler code here
static BOOL done=FALSE;
    CRect rcWin;
    m_Edit.GetWindowRect(&rcWin);
    ScreenToClient(&rcWin);
//
    CFont *pfont=m_Edit.GetFont();
//
    DWORD Style=GetWindowLong(m_Edit.m_hWnd,GWL_STYLE);
    long id=m_Edit.GetDlgCtrlID();
    CString txt;
    m_Edit.GetWindowText(txt);
//
    done = !done;
    if(done)
        Style |=(ES_AUTOHSCROLL|WS_HSCROLL);
    else
        Style &=~(ES_AUTOHSCROLL|WS_HSCROLL);
    CEdit edit;
    edit.Create(Style,rcWin,this,id);
    edit.SetFont(pfont);
    edit.SetWindowText(txt);
 
    m_Edit.DestroyWindow();
    m_Edit.Attach(edit.Detach());
    m_Edit.MoveWindow(rcWin);
}

需要重新创建edit ,这个风格一旦设置就不能再改回来了.