Re: [Flashcoders] Can an object delete itself?
Mark Burvill wrote:
public function die():Void {
trace (deleting);
removeMovieClip (baddie_mc);
delete this;
trace (Am i still alive?);
}
The movieclip is successfully removed, but I would expect the second
trace Am I still alive NOT to appear as the object has been deleted,
but it does.
I read somewhere that it is illegal for an object to delete itself -
is this true?
Is there another easy way of doing this?
I use the delete all the time like you are doing. Flash continues to run
your code until the end of the statement block. I thought that once you
delete something that garbage collection would take over after the
function exits. Someone correct me if I'm wrong.
for example, run this in a new fla
index = 0;
this.onEnterFrame = function () {
if (index==10) {
delete onEnterFrame;
trace(i can still run code but only until the function closes)
}
trace(index=+index++)
}
Judah
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RE: [Flashcoders] Can an object delete itself?
delete something that garbage collection would take over after the
function exits. Someone correct me if I'm wrong.
Yes, you can do that with Flash methods like onEnterFrame, but not objects.
Notice, just because you delete an object like that and it doesn't respond
to methods that cause a trace event doesn't mean it's gone. It's just
orphaned (has no reference) but it will never get collected.
If you want to see an example of this.
function loadMyXML() {
myXML = new XML();
myXML.onLoad = function() {
trace(xml loaded);
delete this;
}
myXML.load(someurl.xml);
}
BTN_Loader.onRelease = function() {
trace(myXML = + myXML.onLoad);
loadMyXML();
};
Click the button after each time the xml is loaded. You will see that myXML
cannot delete itself because the trace on the button spits out [type
Function].
So, let's take it to the next step, and create a for loop that will delete
any completed XML objects.
this.xmlHolder = {};
//
function loadMyXML() {
for (var i in this.xmlHolder) {
if (this.xmlHolder[i].complete) {
delete this.xmlHolder[i];
}
}
var id = new Date().getTime();
this.xmlHolder[id] = new XML();
this.xmlHolder[id].ignoreWhite = true;
this.xmlHolder[id].onLoad = function() {
trace(xml loaded);
this.complete = true;
};
this.xmlHolder[id].load(someurl.xml);
}
BTN_Loader.onRelease = function() {
var n = 0;
for (var a in xmlHolder) {
n++;
}
trace(xmlObjs = + n);
loadMyXML();
};
When you click the button, you will see 0, and then 1 every time. Looks
like it is working, right? The object and the reference are both getting
deleted.
However, if you continue to do this, you will see your memory usage continue
going up slowly over time. Yes, the XML object is getting deleted, but the
onLoad function you assigned is being orphaned and thus is not getting
cleaned up by the garbage collector. So, you have to explicitly delete the
onLoad function of the xml object before you delete the xml object.
for (var i in this.xmlHolder) {
if (this.xmlHolder[i].complete) {
delete this.xmlHolder[i].onLoad;
delete this.xmlHolder[i];
}
}
Now you have no memory waste. It's really only an issue with apps you
expect to continue running for quite some time. The onLoads that pile up
constitute only a little bit each time, but it does add up.
HTH,
Steven
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[Flashcoders] Can an object delete itself?
Hi all,
I've just started transitioning to AS2 (so go easy on me), and have a
question about a game I'm building...
I have a Baddie object which handles a baddie on the screen, and when
one gets killed, and has finished it's death animation, I'm running a
method within the Baddie object called die() which deletes the
associated movieClip, and then is meant to delete the baddie Object
itself, but it doesn't seem to work
public function die():Void {
trace (deleting);
removeMovieClip (baddie_mc);
delete this;
trace (Am i still alive?);
}
The movieclip is successfully removed, but I would expect the second
trace Am I still alive NOT to appear as the object has been deleted,
but it does.
I read somewhere that it is illegal for an object to delete itself - is
this true?
Is there another easy way of doing this?
Thanks! :o)
Mark
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Re: [Flashcoders] Can an object delete itself?
Mark Burvill wrote:
Hi all,
I've just started transitioning to AS2 (so go easy on me), and have a
question about a game I'm building...
I have a Baddie object which handles a baddie on the screen, and
when one gets killed, and has finished it's death animation, I'm
running a method within the Baddie object called die() which deletes
the associated movieClip, and then is meant to delete the baddie
Object itself, but it doesn't seem to work
public function die():Void {
trace (deleting);
removeMovieClip (baddie_mc);
delete this;
trace (Am i still alive?);
}
The movieclip is successfully removed, but I would expect the second
trace Am I still alive NOT to appear as the object has been deleted,
but it does.
I read somewhere that it is illegal for an object to delete itself -
is this true?
Is there another easy way of doing this?
Thanks! :o)
Mark
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No sir, objects do not delete themselves. For my projects i have an
external destructor function, for instance:
//enemy class
class Enemy{
private var creator:Object;
private var myClip:MovieClip;
public function Enemy(c:Object){
creator = c;
}
public function death():Void{
playSound(explosion); //for instance
removeMovieClip(myClip);
}
public function destroy():Void{
creator.destroyEnemy(this);
}
}
//whatever deploys the enemies
var enemies:Array;
function addEnemy(){
enemies.push(new Enemy());
}
function destroyEnemy(e:Enemy){
for(var i = enemies.length;i--;){
if(enemies[i]==e){
enemies[i].death();
enemies.splice(i,1);
break;
}
}
}
Didnt give this much thought so its probably not brilliant, but you get
the idea
- A
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Re: [Flashcoders] Can an object delete itself?
Legal or not, it's very unwise to let an object kill itself. Letting
an object commit suicide would leave the rest of a program in a lurch
as it wouldn't really know where to go from there. You haven't
officially returned back to the caller at that point. You are better
off sending out an event to a container object that will put you on
death row, so you can be properly disposed of when you are finished
executing.
jord
On Dec 21, 2005, at 8:44 AM, Mark Burvill wrote:
public function die():Void {
trace (deleting);
removeMovieClip (baddie_mc);
delete this;
trace (Am i still alive?);
}
The movieclip is successfully removed, but I would expect the
second trace Am I still alive NOT to appear as the object has
been deleted, but it does.
I read somewhere that it is illegal for an object to delete itself
- is this true?
Is there another easy way of doing this?
--
Jordan L. Chilcott, President
Interactivity Unlimited
Guelph, Ontario
-
Tel: (519) 837-1879
eFax: (253) 276-8631
mailto:[EMAIL PROTECTED]
http://www.interactivityunlimited.com
iChat/AIM: j1chilcott
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Author: Building Dynamic Web Sites with Macromedia Studio MX
Author: Flash Professional 8: Training From the Source
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Re: [Flashcoders] Can an object delete itself?
Nice one - thanks Andreas. :o)
Andreas Rønning wrote:
Mark Burvill wrote:
Hi all,
I've just started transitioning to AS2 (so go easy on me), and have a
question about a game I'm building...
I have a Baddie object which handles a baddie on the screen, and
when one gets killed, and has finished it's death animation, I'm
running a method within the Baddie object called die() which deletes
the associated movieClip, and then is meant to delete the baddie
Object itself, but it doesn't seem to work
public function die():Void {
trace (deleting);
removeMovieClip (baddie_mc);
delete this;
trace (Am i still alive?);
}
The movieclip is successfully removed, but I would expect the second
trace Am I still alive NOT to appear as the object has been
deleted, but it does.
I read somewhere that it is illegal for an object to delete itself -
is this true?
Is there another easy way of doing this?
Thanks! :o)
Mark
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No sir, objects do not delete themselves. For my projects i have an
external destructor function, for instance:
//enemy class
class Enemy{
private var creator:Object;
private var myClip:MovieClip;
public function Enemy(c:Object){
creator = c;
}
public function death():Void{
playSound(explosion); //for instance
removeMovieClip(myClip);
}
public function destroy():Void{
creator.destroyEnemy(this);
}
}
//whatever deploys the enemies
var enemies:Array;
function addEnemy(){
enemies.push(new Enemy());
}
function destroyEnemy(e:Enemy){
for(var i = enemies.length;i--;){
if(enemies[i]==e){
enemies[i].death();
enemies.splice(i,1);
break;
}
}
}
Didnt give this much thought so its probably not brilliant, but you
get the idea
- A
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www.eyegas.com http://www.eyegas.com
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Re: [Flashcoders] Can an object delete itself?
maybe I am just thinking out loud (and my mind is a tricky one)
but, don't you delete an object's instances and not directly the class
itself (how could it delete itself ?) ?
like:
var baddieInstance = new Baddie();
... later ...
baddieInstance.die(); // internal deletion process (like
removeListener ,)
delete(baddieInstance); // instance deletion
??
Cedric
Nice one - thanks Andreas. :o)
Andreas Rønning wrote:
Mark Burvill wrote:
Hi all,
I've just started transitioning to AS2 (so go easy on me), and have
a question about a game I'm building...
I have a Baddie object which handles a baddie on the screen, and
when one gets killed, and has finished it's death animation, I'm
running a method within the Baddie object called die() which deletes
the associated movieClip, and then is meant to delete the baddie
Object itself, but it doesn't seem to work
public function die():Void {
trace (deleting);
removeMovieClip (baddie_mc);
delete this;
trace (Am i still alive?);
}
The movieclip is successfully removed, but I would expect the second
trace Am I still alive NOT to appear as the object has been
deleted, but it does.
I read somewhere that it is illegal for an object to delete itself -
is this true?
Is there another easy way of doing this?
Thanks! :o)
Mark
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No sir, objects do not delete themselves. For my projects i have an
external destructor function, for instance:
//enemy class
class Enemy{
private var creator:Object;
private var myClip:MovieClip;
public function Enemy(c:Object){
creator = c;
}
public function death():Void{
playSound(explosion); //for instance
removeMovieClip(myClip);
}
public function destroy():Void{
creator.destroyEnemy(this);
}
}
//whatever deploys the enemies
var enemies:Array;
function addEnemy(){
enemies.push(new Enemy());
}
function destroyEnemy(e:Enemy){
for(var i = enemies.length;i--;){
if(enemies[i]==e){
enemies[i].death();
enemies.splice(i,1);
break;
}
}
}
Didnt give this much thought so its probably not brilliant, but you
get the idea
- A
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www.eyegas.com http://www.eyegas.com
*Work:* 0117 953 0100
*Mobile*: 07780 608498
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RE: [Flashcoders] Can an object delete itself?
If you're going to constantly be creating enemies, you might want to simple
do a check of existing enemies and if an enemy is dead, delete it when you
create one.
The important thing to note is that an enemy cannot call the destroyEnemy()
method of its manager because then it's still the same thread (the method is
being called from the object you're trying to delete). It has to happen
independantly outside the object. If you want the enemies to manage
themselves, it is best to just give them a boolean property called dead (for
instance) and then check independantly for dead enemies somewhere else.
enemies = {};
function createEnemy() {
for (var a in enemies) {
if (enemies[a].dead) {
for (var b in enemies[a]) {
delete enemies[a][b];
}
delete enemies[a];
}
}
// code to create an enemy
// enemies[enemyID] = new Baddie();
}
enemies[enemyID].dead = true;
Or
baddie.onKilled = function() {
this.dead = true;
}
Notice that I've gone through and deleted level one props/methods inside the
enemy object. If you apply methods to an enemy object after you instantiate
it, you should delete those methods before you delete the object or they get
orphaned and memory waste can occur. Hence, my delete loop through the
enemy object before deleting it.
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