繼承CDialogEx,并在 OnInitDialog() 添加一下代碼

SetBackgroundColor(#010b15); 
LONG ExtendedStyle = GetWindowLong(GetSafeHwnd(),GWL_EXSTYLE ); 
SetWindowLong(GetSafeHwnd(),GWL_EXSTYLE,ExtendedStyle | WS_EX_LAYERED ); 
::SetLayeredWindowAttributes(GetSafeHwnd(),#010b15,0,LWA_COLORKEY);