Note that not all windows are necessarily NSWindows, and that NSWindow only provides an interface to windows in your own address space.
The supported way to access every window is the CGWindow API. Take a look at the Son of Grab sample code to see how it's done.
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
