如何访问桌面窗口

静态函数CWnd:: GetDesktopWindow 返回桌面窗口的指针。下例说明了MFC函数
CFrameWnd::BeginModalStae是如何使用该函数进入内部窗口列表的。

void CFrameWnd::BeginModalState ()
{
…
//first count all windows that need to be disabled
UINT nCount=0
HWND hWnd= :: GetWindow (:: GetDesktopWindow(), GW_CHILD)
while (hWnd!=NULL)
{
if (:: IsWindowEnabled (hwnd)
&& CWnd::FromHandlePermanent (hWnd)!=NULL
&& AfxIsDescendant (pParent->m_hWnd, hWnd)
&& :: SendMessage (hWnd, WM_DISABLEMODAL, 0, 0)==0)
{
++nCount
}
hWnd=:: GetWindow (hWnd, GW_HWNDNEXT)
}