由Create一个Child窗口，导出的z序问题

首先遇到的情况，直接看图

看到这现象有点怀疑人生，Windows默认Create顺序是按照Z序依次递增的，然而为何会出现如此现象？

首先和窗口类型确实有关：用的是Child，如果使用popup/overlapped都正常，我们通常非模态对话框用overlapped最多，这次要做子窗口管理，才发现有如此问题。考虑在窗口类型上选择：层叠/弹出/子窗口。选择Child类型是必须的（根据需求）。于是想办法改变窗口Z序，windowsZ序说明并不多，看来也是不复杂的原因，搜索相关函数

BOOL SetWindowPos(  const CWnd* pWndInsertAfter,  int x,  int y,  int cx,  int cy,  UINT nFlags  );

pWndInsertAfter

Identifies the CWnd object that will precede (be higher than) this CWnd object in the Z-order. This parameter can be a pointer to a CWnd or a Pointer to one of the following values:

• wndBottom   Places the window at the bottom of the Z-order. If this CWnd is a topmost window, the window loses its topmost status; the system places the window at the bottom of all other windows.

• wndTop   Places the window at the top of the Z-order.

• wndTopMost   Places the window above all non-topmost windows. *重点The window maintains its topmost position even when it is deactivated*.

• wndNoTopMost   Repositions the window to the top of all non-topmost windows (that is, behind all topmost windows). *重点This flag has no effect if the window is already a non-topmost window*.

换句话说，就此4中Z序：底部/顶部/最顶/非最顶，这都是相对你要插入的窗口指针的

看微软注释：

 static AFX_DATA const CWnd wndTop; // SetWindowPos's pWndInsertAfter
 static AFX_DATA const CWnd wndBottom; // SetWindowPos's pWndInsertAfter
 static AFX_DATA const CWnd wndTopMost; // SetWindowPos pWndInsertAfter
 static AFX_DATA const CWnd wndNoTopMost; // SetWindowPos pWndInsertAfter