AutoHotkey - Clip cursor to rectangle

ClipCursor.ahk

#Requires AutoHotkey v2.0

; Source for AHK v1: https://www.autohotkey.com/boards/viewtopic.php?p=445668&sid=dee54807a74853039237b72c90610eae#p445668
ClipCursor(x := "", y := "", w := "", h := "") {
    if p := x != "" {
        VarSetStrCapacity(&RECT, 16)
        p := StrPtr(RECT)
        for k, v in [x, y, x + w, y + h] {
            target := p + 4 * (k - 1)
            NumPut("Int", v, target)
        }
    }
    DllCall("ClipCursor", "Ptr", p)
}