如何检索原先的Task Manager应用程序使用的任务列表

原先的Task Manager应用程序显示顶层窗口的列表。为了显示该列表，窗口必须可见、包含一个标题以及不能被其他窗口拥有。调用CWnd:: GetWindow可以检索顶层窗口的列表，调用IsWindowVisible、GetWindowTextLength以及GetOwner可以确定窗口是否应该在列表中。下例将把TaskManager窗口的标题填充到列表中。
void GetTadkList (CListBox&list)
{
CString strCaption
//Caption of window.
list.ResetContent ()
//Clear list box.
//Get first Window in window list.
ASSERT_VALID (AfxGetMainWnd ())
CWnd* pWnd=AfxGetMainWnd () ->GetWindow (GW_HWNDFIRST)
//Walk window list.
while (pWnd)
{
// I window visible, has a caption, and does not have an owner?
if (pWnd ->IsWindowVisible()
&& pWnd ->GetWindowTextLength ()
&&! pWnd ->GetOwner ())
{
//Add caption o window to list box.
pWnd ->GetWindowText (strCaption)
list.AddString (strCaption)
}
//Get next window in window list.
pWnd=pWnd ->GetWindow(GW_HWNDNEXT)
}
}