WM_SYSCOMMAND 小结

::SendMessage(GetParent()->m_hWnd, WM_SYSCOMMAND, SC_MOVE| HTCAPTION, 0); 鼠标按下的时候------拖动

if(GetParent()->IsZoomed()==FALSE)   //双击的时候 ----最大化，最小化
{
::SendMessage(GetParent()->m_hWnd, WM_SYSCOMMAND, SC_MAXIMIZE, 0);
}
else
{

::SendMessage(GetParent()->m_hWnd, WM_SYSCOMMAND, SC_RESTORE, 0);
}