//将客户坐标转换成屏幕坐标 
ClientToScreen(&point); 
//返回一个包含指定屏幕坐标点的窗口 
CWnd* pWnd = CWnd::WindowFromPoint(point); 
if (pWnd) 
{ 
//获取窗口句柄 
HWND hwndCurr = pWnd->GetSafeHwnd(); 
if ((::GetWindowThreadProcessId (GetSafeHwnd(), NULL)) != 
(::GetWindowThreadProcessId (hwndCurr, NULL))) 
{ 
char lpClassName[255]; 
//获取类名 
if (::GetClassName(hwndCurr, lpClassName, 255)) 
{ 
//判断是否是Edit控件 
if (0 == m_strWndClass.CompareNoCase("EDIT")) 
{ 
//获取窗口风格 
LONG lStyle = ::GetWindowLong(hwndCurr, GWL_STYLE); 
//如果设置了ES_PASSWORD属性 
if (lStyle & ES_PASSWORD) 
{ 
char szText[255]; 
//通过掌握的句柄hwndCurr向此控件发送WM_GETTEXT消息 
::SendMessage(hwndCurr, WM_GETTEXT, 255, (LPARAM)szText); 
//密码已保存在szText中 
m_strPassword = szText; 
} 
} 
} 
} 
}

ClientToScreen(&point); 
CWnd* pWnd = CWnd::WindowFromPoint(point); 
HWND hwndCurr = pWnd->GetSafeHwnd();