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Senior Member
 [RESOLVED] add child to stage
I get the following error when i try to addChild to the stage.....1180: Call to a possibly undefined method addChild.....I'm not within the document class root and I can't google a relevant search result..Please help me learn to add something to the stage from within a class definition...the passit variable refers to the class which puts a camera object on stage....works fine if I call it from the .fla but I want to add it to the stage from within and .AS document. Thanks ahead of time for your help.
PHP Code:
package NetConnections.NetStreams{
import flash.net.NetConnection;
import flash.net.NetStream;
import flash.events.NetStatusEvent;
import flash.display.Stage;
import NetConnections.NetConnections;
import NetConnections.NetStreams.CameraExample;
public class NetStreamex {
public var stream:NetStream;
public var test:*;
public var passit:Object;
public function NetStreamex(nc):void {
stream = new NetStream(nc);
stream.publish("test");
nc.call("checkBandwidth",null);
passit = new CameraExample(nc,stream);
addChild(passit);
var _stage:Stage = passit.stage;
}
}
}
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Senior Member
You need to extend the class to the Sprite or MovieClip class, which have that method.
- The right of the People to create Flash movies shall not be infringed. -
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Given your other threads, I do not think that you intended NetStreamx to be a displayObject. Only DisplayObjects (specifically subclasses of DisplayObjectContainer) have the addChild method.
You could make NetStreamx extend Sprite, but then you'd have to put your instance of NetStreamx on the stage in order to see its children.
It looks more like you just want NetStreamx to set up some relations between other classes. If I don't completely misread you, you just want to get a functional CameraExample out, and then do stuff with it elsewhere. You could write a static method to build a CameraExample.
Code:
public static function buildCameraExample(nc:NetConnection):CameraExample {
var stream:NetStream = new NetStream(nc);
stream.publish("test");
nc.call("checkBandwidth",null);
return new CameraExample(nc,stream);
}
Then you can call that method from some other class which is a DisplayObjectContainer and put the returned CameraExample on the stage.
Again, I really don't have a good idea of the entire architecture of your project. And, no offense intended, I don't think you do either.
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Senior Member
now i get the notice .....TypeError: Error #1009: Cannot access a property or method of a null object reference.
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Using what code?
I think it may be most helpful if you describe the general goal that you have, and perhaps one of us can outline an organization that streamlines the process.
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Senior Member
I need to add my camera object to the stage after netStream fires because it passes its variable to the camera class . I'm going to put my code here in the order in which it flows.
#1.......net connection fires then calls netstream and passes its netconnection (nc) refrence.
PHP Code:
package NetConnections{
import flash.net.NetConnection;
import flash.events.NetStatusEvent;
import flash.events.SecurityErrorEvent;
import flash.events.AsyncErrorEvent;
import flash.events.IOErrorEvent;
import flash.net.ObjectEncoding;
import NetConnections.NetStreams.NetConnectionClient;
import NetConnections.NetStreams.NetStreamex;
public class NetConnections extends NetConnection {
public var stream:Object;
public var nc:Object;
public function NetConnections():void {
super();
addEventListener(NetStatusEvent.NET_STATUS, onConnectionStatus);
addEventListener(SecurityErrorEvent.SECURITY_ERROR,onSecurityError);
addEventListener(AsyncErrorEvent.ASYNC_ERROR, onAsyncError);
addEventListener(IOErrorEvent.IO_ERROR, onIOError);
this.client = new NetConnectionClient();
createNetConnection("rtmp://localhost/test/1");
nc = this;
}
public function createNetConnection(command:String, ... arguments):void {
arguments.unshift(command);
super.connect.apply(this, arguments);
}
protected function onConnectionStatus(event:NetStatusEvent):void {
trace("#onConnectionStatusEvent# "+event.info.code);
var infoObjectsArray:Array = event.info.code.split(".");
if (infoObjectsArray[1] == "Connect") {
switch (infoObjectsArray[2]) {
case "Success" :
dispatchEvent(new NetStatusEvent("onConnect", false, false, event.info));
stream = new NetStreamex(nc);
break;
case "Closed" :
break;
}
}
}
protected function onSecurityError(event:SecurityErrorEvent):void {
trace("#onSecurityError# "+event.text);
}
protected function onAsyncError(event:AsyncErrorEvent):void {
trace("#onAsyncError#"+event.error.message);
}
protected function onIOError(event:IOErrorEvent):void {
trace("#onIOError#"+event.text);
}
}
}
#2 netstream fires and puts camera object on stage and passes nc and stream to camera class.
PHP Code:
package NetConnections.NetStreams{
import flash.net.NetConnection;
import flash.net.NetStream;
import flash.events.NetStatusEvent;
import flash.display.Stage;
import flash.events.*;
import flash.display.DisplayObject;
import NetConnections.NetConnections;
import NetConnections.NetStreams.CameraExample;
import flash.display.Sprite;
public class NetStreamex extends Sprite{
public var stream:NetStream;
public var test:*;
public function NetStreamex(nc):void {
stream = new NetStream(nc);
stream.publish("test");
nc.call("checkBandwidth",null);
var passit:CameraExample = new CameraExample(nc,stream);
var checkit = stage.addChild(passit);
trace(checkit);
}
}
}
#3...camera class detects the camera object has been added to the stage via event listener and connects the netstream to the camera...this is where i get the error TypeError: Error #1009: Cannot access a property or method of a null object reference.
PHP Code:
package NetConnections.NetStreams{
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.*;
import flash.media.Camera;
import flash.media.Video;
import flash.net.NetStream;
import flash.events.NetStatusEvent;
public class CameraExample extends Sprite{
private var video:Video;
public function CameraExample(nc,stream) {
addEventListener(Event.ADDED_TO_STAGE, init(stream));
}
private function init(stream):Function{
return function(event:Event):void
{
trace(stream);
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
var camera:Camera = Camera.getCamera();
if (camera != null) {
camera.addEventListener(ActivityEvent.ACTIVITY, activityHandler);
video = new Video(camera.width * 2, camera.height * 2);
video.x =150;
video.y =150;
video.attachCamera(camera);
//netStream.attachCamera(camera);
addChild(video);
} else {
trace("You need a camera.");
}
}
};
private function activityHandler(event:ActivityEvent):void {
trace("activityHandler: " + event);
}
}
}
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It looks like you come from a procedural programming background and are having some difficulty transitioning to object oriented design. I say this because of the use of terms like "fire", and trying to do everything as a result of the constructor functions. Objects/classes do not "fire". They are things, which have properties and methods.
The 1009 error you are getting is actually not from CameraExample, if I read it right. It should be thrown by this line:
Code:
var checkit = stage.addChild(passit);
because when that line is executed, the NetStreamx is not on the stage. It can't be, because a) that line is in the constructor, and b) it is created by a NetConnections which is not a DisplayObject and has no reference to the stage to attempt to add the NetStreamx to, even if it tried. Which it doesn't.
Let's start from the top.
You have a document class or an fla. For this exercise which one you choose is not important. That class, which I will call Main, IS a DisplayObject and is on the stage at runtime. Main needs to a) set up a Netstream b) set up a camera c) get them put together somehow. It can delegate these responsibilities to other classes. Netconnections is a class which automates setting up a NetStream. I do not think you need NetStreamx at all. CameraExample is a class which sets up a Camera, and attaches it to a video and a NetStream.
So, here's some code sketches. These are rough, and probably contain typos and minor bugs. I will leave out import statements for brevity and because I am lazy.
Main.as (make this your Document Class)
PHP Code:
package {
public class Main extends Sprite {
private var stream:NetStream;
private var camex:CameraExample;
private var connectionURL:String = "rtmp://localhost/test/1";
public function Main() {
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
var nc:NetConnections = new NetConnections();
nc.addEventListener("onConnect", handleConnect);
nc.connect(connectionURL);
}
private function handleConnect(event:Event):void{
stream = NetConnections(event.currentTarget).stream;
camex = new CameraExample(stream);
addChild(camex);
}
}
}
NetConnections.as
PHP Code:
package NetConnections{
import flash.net.NetConnection;
import flash.events.NetStatusEvent;
import flash.events.SecurityErrorEvent;
import flash.events.AsyncErrorEvent;
import flash.events.IOErrorEvent;
import flash.net.ObjectEncoding;
import NetConnections.NetStreams.NetConnectionClient;
import NetConnections.NetStreams.NetStreamex;
public class NetConnections extends NetConnection {
public var stream:NetStream;
public function NetConnections():void {
super();
addEventListener(NetStatusEvent.NET_STATUS, onConnectionStatus);
addEventListener(SecurityErrorEvent.SECURITY_ERROR,onSecurityError);
addEventListener(AsyncErrorEvent.ASYNC_ERROR, onAsyncError);
addEventListener(IOErrorEvent.IO_ERROR, onIOError);
this.client = new NetConnectionClient(); //what is this for?
}
public function connect(command:String):void{
createNetConnection(command);
}
public function createNetConnection(command:String, ... arguments):void {
arguments.unshift(command);
super.connect.apply(this, arguments);
}
protected function onConnectionStatus(event:NetStatusEvent):void {
trace("#onConnectionStatusEvent# "+event.info.code);
var infoObjectsArray:Array = event.info.code.split(".");
if (infoObjectsArray[1] == "Connect") {
switch (infoObjectsArray[2]) {
case "Success" :
stream = new NetStream(this);
stream.publish("test");
call("checkBandwidth",null);
dispatchEvent(new Event("onConnect", false, false, event.info));
break;
case "Closed" :
break;
}
}
}
protected function onSecurityError(event:SecurityErrorEvent):void {
trace("#onSecurityError# "+event.text);
}
protected function onAsyncError(event:AsyncErrorEvent):void {
trace("#onAsyncError#"+event.error.message);
}
protected function onIOError(event:IOErrorEvent):void {
trace("#onIOError#"+event.text);
}
}
}
CameraExample.as (note, I don't think this should go in the NetConnections.NetStreams package, but that's your choice)
PHP Code:
package NetConnections.NetStreams{
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.*;
import flash.media.Camera;
import flash.media.Video;
import flash.net.NetStream;
import flash.events.NetStatusEvent;
public class CameraExample extends Sprite{
private var video:Video;
private var stream:NetStream;
public function CameraExample(stream:NetStream) {
this.stream = stream;
addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(event:Event):void
{
trace(stream);
var camera:Camera = Camera.getCamera();
if (camera != null) {
camera.addEventListener(ActivityEvent.ACTIVITY, activityHandler);
video = new Video(camera.width * 2, camera.height * 2);
video.x =150;
video.y =150;
video.attachCamera(camera);
stream.attachCamera(camera);
addChild(video);
} else {
trace("You need a camera.");
}
}
private function activityHandler(event:ActivityEvent):void {
trace("activityHandler: " + event);
}
}
}
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Senior Member
after careful modification of your main.as file I was able to get everything to attach properly.........here is the final main.as file.....Thankyou so much for helping me Now i can study this application and hopefully learn how to write AS 3.0 I've noticed its not only how you add and process things on the stage but also when. AS 2.0 I could add somthing to the stage and access and process on it anytime.
PHP Code:
package {
import NetConnections.NetConnections;
import NetConnections.NetStreams.CameraExample;
import NetConnections.NetStreams.NetStreamex;
import flash.display.MovieClip;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.net.NetStream;
import flash.events.NetStatusEvent;
public class main extends MovieClip {
public var stream:*;
private var camex:CameraExample;
public var nc1:*;
public function main() {
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
nc1=new NetConnections();
nc1.createNetConnection("rtmp://localhost/test/1");
nc1.addEventListener("onConnect", handleConnect);
}
private function handleConnect(event:NetStatusEvent):void{
stream = new NetStreamex(nc1);
camex = new CameraExample(nc1,stream.stream);
trace("stream2 =" +stream);
addChild(camex);
}
}
}
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Congrats on getting it working. In the future, you should be very wary of *-typing variables. There are not many circumstances that warrant it. Instead, I'd have declared nc1 as type NetConnections and stream as NetStreamx.
The reason for this is twofold. First, *-typing is actually slower in some cases, but except in tight loops that really isn't a concern. Second, by using specific types you get the compile-time type checking which prevents an entire class of run-time errors.
On a less technical note, I'd like to thank you for having a good attitude and the willingness to actually learn rather than just get your immediate questions answered.
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