Window.swift

class Window {
    
    let element: AXUIElementRef
    
    init?(processID: pid_t) {
        element = AXUIElementCreateApplication(processID).takeRetainedValue()
    }
    
    var processID: pid_t {
        let pointer = UnsafeMutablePointer<pid_t>.alloc(1)
        AXUIElementGetPid(element, pointer)
        let value = pointer.memory
        pointer.dealloc(1)
        return value
    }
    
}