Getting row number when double clicking listview control

[xyjiang]

Hi, I try to get the row number when clicking listview control by using HitTest(), but it doesn't.
I put the listview control on a dialog bar. Does it matter?
nIndex always returns -1


void CMainFrame::OnDblclkList1(NMHDR* pNMHDR, LRESULT* pResult)
{
// TODO: Add your control notification handler code here

CListCtrl* pListCtrl = (CListCtrl*)m_wndDlgBar.GetDlgItem(IDC_LIST2);

DWORD dwPos = ::GetMessagePos() ;
CPoint point ((int) LOWORD (dwPos), (int) HIWORD (dwPos)) ;
pListCtrl->ScreenToClient (&point) ;

int nIndex ;
if ((nIndex = pListCtrl->HitTest (point)) != -1)
{
CString string = pListCtrl->GetItemText (nIndex, 0) ;
MessageBox(string) ;
}

*pResult = 0;
}