import QtQuick 2.7 import Test 1.0 MyArrayBufferTestClass { property bool ok: false onByteArraySignal: { var view = new DataView(arg); ok = arg instanceof ArrayBuffer && arg.byteLength == 2 && view.getUint8(0) == 42 && view.getUint8(1) == 43; } Component.onCompleted: emitByteArraySignal(42, 2) }