昨天寫了MoveWindow函數，今天又要寫SetWindowPos函數，因為MoveWindow確實不好，浪費了差不多一天時間。。。對于主窗口，選擇了Center屬性就可以移動位置，不選就不行；窗口資源過大也不能移動；改變后窗口的尺寸大于等于屏幕尺寸的話，在它上面DoModal出來的新窗口不能移動。。原來，使用MoveWindow移動對話框位置似乎有很苛刻的條件，一不小心就原地不動了，而且我也實在琢磨不透這樣的條件，網上也沒有查處來。今天用了SetWindowPos后，才發現，果然好用！

Parameters

pWndInsertAfter

Identifies the CWnd object that will precede 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 nontopmost windows. The window maintains its topmost position even when it is deactivated.
• wndNoTopMost   Repositions the window to the top of all nontopmost windows (that is, behind all topmost windows). This flag has no effect if the window is already a nontopmost window.

nFlags

Specifies sizing and positioning options. This parameter can be a combination of the following: 常用的是SWP_SHOWWINDOW

注意：
    這里的坐標參數用的是Client坐標，對于子窗口用的是其父窗口的坐標系。然而對于用DoModal()彈出的窗口，如果在資源屬性里沒有選擇Child屬性的話，它的父窗口是DeskTop，而不是調用DoModal()的窗口。