为什么EnumWindows会返回比我预期更多的窗口？

Question

在VC++中,我使用EnumWindows(...),GetWindow(...)和GetWindowLong()来获取窗口列表并检查窗口是否是顶部窗口(没有其他窗口作为所有者),以及窗口是否是可见的(WS_VISIBLE).然而,虽然我的桌面只显示了5个窗口,但这个EnumWindows给了我50个窗口,多么有趣!任何Windows极客都请帮我澄清一下......

Answer 1

Raymond在MSDN博客上的这篇文章中描述了仅列出任务栏中的窗口(或类似地在Alt-Tab框中)的方法:http:
//blogs.msdn.com/b/oldnewthing/archive/2007/10/08 /5351207.aspx

这是检查alt-tab中是否显示窗口的超级函数:

BOOL IsAltTabWindow(HWND hwnd)
{
    TITLEBARINFO ti;
    HWND hwndTry, hwndWalk = NULL;

    if(!IsWindowVisible(hwnd))
        return FALSE;

    hwndTry = GetAncestor(hwnd, GA_ROOTOWNER);
    while(hwndTry != hwndWalk) 
    {
        hwndWalk = hwndTry;
        hwndTry = GetLastActivePopup(hwndWalk);
        if(IsWindowVisible(hwndTry)) 
            break;
    }
    if(hwndWalk != hwnd)
        return FALSE;

    // the following removes some task tray programs and "Program Manager"
    ti.cbSize = sizeof(ti);
    GetTitleBarInfo(hwnd, &ti);
    if(ti.rgstate[0] & STATE_SYSTEM_INVISIBLE)
        return FALSE;

    // Tool windows should not be displayed either, these do not appear in the
    // task bar.
    if(GetWindowLong(hwnd, GWL_EXSTYLE) & WS_EX_TOOLWINDOW)
        return FALSE;

    return TRUE;
}

在此处归功于源代码:http:
//www.dfcd.net/projects/switcher/switcher.c