WS\u CLIPCHILDREN在全屏模式下不工作

if (!fullscreen)
{
    wStyle = WS_OVERLAPPED | WS_BORDER | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_CLIPCHILDREN;
    wExStyle = WS_EX_TOPMOST;
}
else
{
    wStyle = WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN;
    wExStyle = WS_EX_TOPMOST;
}

我还创建了一个子窗口运行时:

wStyle = WS_VISIBLE | WS_POPUP | WS_CHILD;
wExStyle = WS_EX_TOPMOST;

但是,当我处于全屏模式时,父窗口被绘制在子窗口上,这会导致可怕的闪烁。

如何设置主窗口和子窗口的属性,以便即使在全屏模式下也能很好地显示子窗口?

谢谢你的回答。