学步园

通常在设计对话框程序时，需要获取子控件在对话框中的坐标。例如，希望得到IDOK button在对话框中的矩形坐标，可以试采取如下方法。

  CRect m_rect_OK;                                                            //定义对话框矩形
  GetDlgItem(IDOK)->GetWindowRect(&m_rect_OK);   //得到相对整个屏幕的坐标

  ScreenToClient(&m_rect_OK);                                         //转化为在父窗口（对话框）中的坐标

以下一段小程序显示了如何将IDOK button移至对话框正中间：

  CRect m_rect_client;
  CRect m_rect_OK;
  GetWindowRect(&m_rect_client);
  ScreenToClient(&m_rect_client);
  GetDlgItem(IDOK)->GetWindowRect(&m_rect_OK);
  ScreenToClient(&m_rect_OK);
  
  int nX_new, nY_new;
  nX_new = (m_rect_client.left + m_rect_client.right)/2 - m_rect_OK.Width()/2;
  nY_new = (m_rect_client.top + m_rect_client.bottom)/2 - m_rect_OK.Height()/2;
  GetDlgItem(IDOK)->MoveWindow(nX_new, nY_new, m_rect_OK.Width(), m_rect_OK.Height());