为什么不导入此类？ AS3

Question

I try to follow this tutorial

link

This is my code:

import flash.display.Sprite;
import flash.events.Event;
import flash.display.ShaderInput;
import flash.events.KeyboardEvent;
import Input;                               //here is a problem
private function init(e:Event = null):void 
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            // entry point
            square = new Sprite();
            square.graphics.beginFill(0x333333);
            square.graphics.drawRect(0, 0, 30, 30);
            square.x = stage.stageWidth / 2 - square.width / 2;
            square.y = stage.stageHeight / 2 - square.height / 2;
            addChild(square);

          Input.initialize(stage);     //here is another problem

            //Add the refresh loop
            addEventListener(Event.ENTER_FRAME, refresh);
        }

         private function refresh(e:Event):void {
             trace("gigi");
        }

I receive this error:

Line 42 1120: Access of undefined property Input.
Line 7  1172: Definition Input could not be found.

Does anyone know why this error occurs? Unable to import class tutorial Input but it is used.

Thanks in advance!

Answer 1

In the tutorial, there is a "Download Attachment" button which downloads a ZIP containing the Input class. Add this to your src folder.