StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POAS3 - Error #1009: Cannot access a property or method of a null object reference
primarykey
Id
16404087
data
AcceptedAnswerId
16404450
AnswerCount
1
ClosedDate
CommentCount
5
CommunityOwnedDate
CreationDate
2013-05-06T17:37:27.237
FavoriteCount
0
LastActivityDate
2018-06-27T05:25:53.077
LastEditDate
2018-06-27T05:25:53.077
LastEditorUserId
2395282
OwnerUserId
2279702
ParentId
0
PostTypeId
1
Score
0
ViewCount
8082
LastEditorDisplayName
text
Body
Im having a problem with this: <blockquote> Error #1009: Cannot access a property or method of a null object reference. </blockquote> <pre><code>TypeError: Error #1009: Cannot access a property or method of a null object reference. at spyhookerproject_fla::MainTimeline/mapGen() at spyhookerproject_fla::MainTimeline/startGame() at spyhookerproject_fla::MainTimeline/gameLoop() </code></pre> So it the error is happening somewhere in mapGen(), I know that much, I dont know how to solve it. NOTE: MP01, MP02... do NOT have set AS linkage because I cant manipulate the visibility with AS Linkage set. And I get the same problem with removeMuzzle(); Heres the Code: <pre><code>import flash.display.MovieClip; import flash.events.MouseEvent; import flash.text.engine.SpaceJustifier; import flashx.textLayout.operations.MoveChildrenOperation; /*----------------------------Main VARs-----------------------------*/ var STATE_START:String="STATE_START"; var STATE_START_PLAYER:String="STATE_START_PLAYER"; var STATE_PLAY:String="STATE_PLAY"; var STATE_END:String="STATE_END"; var gameState:String; var player:MovieClip; var playerSpeed:Number; var speedLimit:Number; var speedLimitInc:Number; var map:Array; var bullets:Array; //holds civil vehicles var civil:Array; //holds enemy vehicles var enemy:Array; var explosions:Array; var BBullet:MovieClip; var FireBTN:MovieClip; var muzzle:MovieClip; var muzzleArray:Array; //maps //var mp1:MP00; var mp3:MovieClip; var mp1:Array; /* var MP_01:MovieClip; var MP_02:MovieClip; var MP_03:MovieClip; */ //sets the bullet type and properties var BType = "BBasic"; var BProp:Array; //bullet preperties by type var BBasic:Array = new Array(1, 1, 100, 50, 0, new BBasicA()); /** ARRAY SETTING 0 = bullet position (middle , back, sides etc...) 1-middle front 2-left side front 3-right side front 4-left and right side middle 5-back 7-left and right side wheels 1 = bullet direction 1-forward 2-back 3-sides 2 = fire speed (in millisecounds so 1000 = 1sec) 3 = speed of movement 4 = damage 10-100 5 = name of the firing animation in library 6 = name of launch animation in library 7 = name of impact animation in library **/ var level:Number; //BCivil speed and randomness var BCSpeed:Number = 3; var BCRand:Number = 120; /*------------------------------Setup-------------------------------*/ introScreen.visible = false; loadingScreen.visible = false; gameScreen.visible = false; endScreen.visible = false; //map visibility MP00.visible = false; MP01.visible = false; MP02.visible = false; //MpRSimple.visible = false; /*---------------------------Intro screen--------------------------*/ /*-----------------------------mainScreen---------------------------*/ mainScreen.play_btn.addEventListener(MouseEvent.CLICK, clickAway); function clickAway(event:MouseEvent):void { gameStart(); } function gameStart():void { //Move main screen from stage mainScreen.visible = false; //Begin loading the game gameState = STATE_START; trace (gameState); addEventListener(Event.ENTER_FRAME, gameLoop); } /*----------------------------gameLoop-----------------------------*/ function gameLoop(e:Event):void { switch(gameState) { case STATE_START: startGame(); break; case STATE_START_PLAYER: startPlayer(); break; case STATE_PLAY: playGame(); break; case STATE_END: endGame(); break; } } /*-_________________________-Game STATES-_________________________-*/ /*---------------------------STATE_START---------------------------*/ function startGame():void { level = 1; //setting level for enemies playerSpeed = 1; speedLimit = 10; speedLimitInc = 1; //Graphics //player icon player = new Player(); //add bullet holder bullets = new Array(); //basicCivil icon civil = new Array(); //basicEnemy icon enemy = new Array(); //holds explosions explosions = new Array(); //mapGen(); FireBTN = new fireBTN(); FireBTN.y = stage.stageHeight - FireBTN.height; FireBTN.x = stage.stageWidth - FireBTN.width; //map mp3 = MP00; //Load map parts //End startGame gameState = STATE_START_PLAYER; trace(gameState); } /*------------------------STATE_START_PLAYER-----------------------*/ function startPlayer():void { //start the player //set possition of player player.y = stage.stageHeight - player.height; addChild(player); addEventListener(Event.ENTER_FRAME, movePlayer); //changing screens //start game gameState = STATE_PLAY; trace(gameState); } //player controll function movePlayer(e:Event):void { //mouse\touch recognition player.x = stage.mouseX; player.y = stage.mouseY; //player does not move out of the stage /* if (player.x < 0) { player.x = 0; } else if (player.x > (stage.stageWidth - player.width)) { player.x = stage.stageWidth + player.width; }*/ } //setting bullet type /* if (BType == "BBasic") { BProp = BBasic; /*case BMissile; BProp = BMissile; break; }*/ //creating bullets var bulletTimer:Timer = new Timer (100); bulletTimer.addEventListener(TimerEvent.TIMER, timerListener); bulletTimer.start(); trace("nja"); function timerListener(e:TimerEvent):void { //need and if statement to determine the bullet speed and travel depended on type of bullet var tempBullet:MovieClip = new BBasicA(); var mF:MovieClip = new BBMF(); //shoots bullets in the middle mF.x = player.x; mF.y = player.y; tempBullet.x = player.x; tempBullet.y = player.y - player.height / 2; //shooting speed tempBullet.speed = 50; bullets.push(tempBullet); addChild(tempBullet); addChild(mF); //bullets movement forward for(var i=bullets.length-1; i>=0; i--) { tempBullet = bullets[i]; tempBullet.y -= tempBullet.speed; } } /*----------------------------STATE_PLAY---------------------------*/ function playGame():void { //gameplay speedUp(); mapMove(); //fire(); makeBCivil(); makeBEnemy(); moveBCivil(); moveBEnemy(); vhDrops(); testCollision(); testForEnd(); removeExEplosions(); removeMuzzle(); } function speedUp():void { //making speed limit if (playerSpeed < speedLimit) { playerSpeed ++; } //increasing speed limit if (speedLimitInc == 60) { speedLimit ++; speedLimitInc = 1; } speedLimitInc ++; trace("player speed:", playerSpeed); trace("speed limit:", speedLimit); trace("speed limit inc:", speedLimitInc); } function mapMove(){ for(var i:int = mp1.length; i>=0; i--) { var tempMap:MovieClip; tempMap = new mp1[i]; trace ("tempMap", tempMap); tempMap.visible = true; tempMap.y = tempMap.y + playerSpeed; var k:Number = 0; setChildIndex(mp3, k); } trace ("mapMove"); if(mp3.y >= 0 ) { trace ("mapMove, if"); mapGen(); } } function mapGen() { trace ("mapGen"); var mapRand:Number = Math.floor(Math.random()*3); trace ("mapRand:", mapRand); switch (mapRand) { case 0: mp3 = MP00; break; case 1: mp3 = MP01; break; case 2: mp3 = MP02; break; } mp3.x = stage.stageWidth / 2; mp3.y = stage.stageHeight - 1000; addChild(mp3); mp1.push(mp3); } function makeBCivil():void { //random chance var chance:Number = Math.floor(Math.random()*BCRand); if (chance <= 1 + level) { var tempBCivil:MovieClip; //generate enemies tempBCivil = new BCivil(); tempBCivil.speed = BCSpeed + playerSpeed; tempBCivil.x = Math.round(Math.random()*800); addChild(tempBCivil); civil.push(tempBCivil); } } function moveBCivil():void { //move enemies var tempBCivil:MovieClip; for(var i:int = civil.length-1; i>=0; i--) { tempBCivil = civil[i]; tempBCivil.y += tempBCivil.speed } //testion colision with the player and screen out if (tempBCivil.y > stage.stageHeight /* || tempBCivil.hitTestObject(player) */) { trace("ds hit"); //makeExplosion (player.x, player.y); removeCivil(i); //gameState = STATE_END; } } //Test bullet colision function testCollision():void { var tempBCivil:MovieClip; var tempBEnemy:MovieClip; var tempBullet:MovieClip; //civil/bullet colision civils:for(var i:int=civil.length-1; i>=0; i--) { tempBCivil = civil[i]; for (var j:int=bullets.length-1; j>=0; j--) { tempBullet = bullets[j]; if (tempBCivil.hitTestObject(tempBullet)) { trace("laser hit the civil"); makeExplosion (tempBCivil.x, tempBCivil.y); removeCivil(i); removeBullet(j); break civils; } } } //enemy/bullet colision enemy:for(var k:int=enemy.length-1; k>=0; k--) { tempBEnemy = enemy[k]; for (var l:int=bullets.length-1; l>=0; l--) { tempBullet = bullets[l]; if (tempBEnemy.hitTestObject(tempBullet)) { trace("bullet hit the Enemy"); makeExplosion (tempBEnemy.x, tempBEnemy.y); removeEnemy(k); removeBullet(l); break enemy; } } } } function makeExplosion(ex:Number, ey:Number):void { var tempExplosion:MovieClip; tempExplosion = new boom(); tempExplosion.x = ex; tempExplosion.y = ey; addChild(tempExplosion) explosions.push(tempExplosion); } function makeBEnemy():void { //random chance var chance:Number = Math.floor(Math.random()*BCRand); if (chance <= 1 + level) { var tempBEnemy:MovieClip; //generate enemies tempBEnemy = new BEnemy(); tempBEnemy.speed = BCSpeed + playerSpeed; tempBEnemy.x = Math.round(Math.random()*800); addChild(tempBEnemy); enemy.push(tempBEnemy); } } function moveBEnemy():void { //move enemies var tempBEnemy:MovieClip; for(var i:int = enemy.length-1; i>=0; i--) { tempBEnemy = enemy[i]; tempBEnemy.y += tempBEnemy.speed } //testion colision with the player and screen out if (tempBEnemy.y > stage.stageHeight /* || tempBCivil.hitTestObject(player) */) { trace("enemy"); //makeExplosion (player.x, player.y); removeEnemy(i); //gameState = STATE_END; } } function vhDrops():void {} function testForEnd():void { //check damage //end game //gameState = STATE_END; trace(gameState); } /*--------------------REMOVING BS FROM STAGE-----------------------*/ //removing civils function removeCivil(idx:int):void { if(idx >= 0) { removeChild(civil[idx]); civil.splice(idx, 1); } } //removing enemies function removeEnemy(idx:int):void { if(idx >= 0) { removeChild(enemy[idx]); enemy.splice(idx, 1); } } //removing civils function removeBullet(idx:int):void { if(idx >= 0) { removeChild(bullets[idx]); bullets.splice(idx, 1); } } //removing expired explosions function removeExEplosions():void { var tempExplosion:MovieClip; for(var i=explosions.length-1; i>=0; i--) { tempExplosion = explosions[i]; if (tempExplosion.currentFrame >= tempExplosion.totalFrames) { removeExplosion(i); } } } //removing civils function removeExplosion(idx:int):void { if(idx >= 0) { removeChild(explosions[idx]); explosions.splice(idx, 1); } } function removeMuzzle():void { var mF:MovieClip; for(var i=muzzleArray.length-1; i>=0; i--) { mF = muzzleArray[i]; if (mF.currentFrame >= mF.totalFrames) { removeChild(muzzleArray[i]); } } } /*--------------------------STATE_END------------------------------*/ function endGame():void { } /*gameScreen*/ /*endScreen*/ </code></pre> NOTE: The code is no where near finished and doesent have everything in place, some things are placeholder. Thanks in advance! EDIT: Added this into mapMove(); <pre><code>if(mp1 == null) { trace ("mp1 null, MAPGEN"); mapGen(); } </code></pre> Edit : highlight error
Tags
<actionscript-3><null>
Title
AS3 - Error #1009: Cannot access a property or method of a null object reference
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USvimuth
UserOwnerUserId
1. USDominiko
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.