Remove Control from Memory

I've written a VI using VI Scripting that creates an Enum based on an array of Names. For example, if I have an array with "Initialize", "Process", "Exit", I can create a control "State.ctl" consisting of an Enum with these values.
The trouble comes from wanting to "redo" (i.e. re-run) this VI, say because I want to add another state, "Clean-up". If the original VI is in memory (because I'm developing code, and have used it), when I run my Create Enum script, it gives Error 1357 when it tries to write State.ctl, saying it is already in memory. One solution is to exit LabVIEW, restart, and run fresh, with the control-to-be-overwritten not (yet) in memory.
Is there a way to Have My Cake and Eat It, Too? Can I write a VI that will inquire if State.ctl is in memory (for example, by wiring just the name to an Open VI Reference and seeing if there is no error, which means it's in memory) and then purging it from memory? If so, I could avoid the 1357 error.
BS

The All VIs in Memory App property will tell you whether or not the control is still in memory. Alternately, you can try opening it with just the name instead of a full path. If it is in memory, the open will succeed. If the open succeeds, just add the new item. If not, create the whole thing.
Closing something in memory is tricky, since LabVIEW has all sorts of optimizations to keep things in memory and so avoid reloading. You would need to ensure all callees are closed, at the least. You could do this by recursively calling the VI property Caller's Names until you get to the top. Close everything and it should eventually go out of memory.
This account is no longer active. Contact ShadesOfGray for current posts and information.

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Removing items from memory using loop

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they're in the display list. It works correctly, but I also want to
remove each child from memory with the same loop. I can't get it to
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I have tried multiple items in the loop to set each child to
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Here are some:
this.child = null;
var target = this.getChildAt(0);
target = null;

Does PopUpManager "close" event remove PopUp from memory?

I'm using a lot of popup windows (in addition to tooltips) in an application. Does the PopUpManager's close event remove the popup from memory? If not, I'd like to find out how this could be done.
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Problem Removing FocusManager from Memory

Ok, so I have a class that I use as a menu for my program. It has some Flash components and an instance of FocusManager in it. My base class instantiates this class collects the data from the user via the components and then removes the class and continues on with the program. The problem is that after I remove it and move on it is still being held in memory. The file I am using now was created in Flash CS4 and I then I run the profiler on it in Flash Builder 4. After I take the two snap shots and look at the loitering objects I can see that the FocusManager is still there and it is keeping my class there. Here is what the class looks like (I made it simple test one that does what the class from my application is doing):
package
import fl.managers.FocusManager;
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Is there something else that I am not doing? If anyone has some insight into this I would greatly appreciate it.

What I meant is that instead of using whatever erase functionality (I wouldn't know one), the code inside the function modules of FG1 should clear all global data with CLEAR and REFRESH statements before returning to the calling program. Even better would be to not use any global data in FG1 in the first place, if possible, rather work with local data declarations only inside the function modules.
Thomas

Remove apps from memory after use

on iphone 4 I could tap home button twice, touch line of active apps and remove from active memory
how do equivalent with iphone 5

The same way.
For iOS 7: Double tap the Home Button and swipe up on thwe app preview page

How do I remove photos from memory card after I have uploaded photos?

We have iPhoto 11. How do delete photos from a memory card after they have been uploaded in to iPhoto?
Thanks.

delete the iPhoto preference file
HOWEVER a best practice to is to never have any computer program (including iPhoto) delete the photos from the card but to import the photos and keep them and then after at least one successful backup cycle has completed and then reformat the card -- I use three very large (32 GB) cards in rotation so I do not reformat for typically a year or more giving me one more long term backup of my photos
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You pays your money and makes your choice - but you are playing a very risky game with no rewards
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Cannot remove JTable from memory

Hi,
I am new to this forum so please forgive me if I make some naive errors. We are developing a component-based software in which the GUI can respond to a user's click to show a JTable in a JPanel. Because the loading of the JTable might take a while since some of our data can have a million columns (I cannot help that), we used a thread to manage the loading of the JTable. So the process is as followed:
1. In a method called "invokeThread", we first get an instance of the JTable as in the code (IVComponent is an interface that our JTable-derived table implements):
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This works fine to load the data into the JTable. However, once the JTable's use is finished and the user wants to get rid of it to save on JVM memory, we allow the user to delete that JTable. Now the reason I am asking for help is that although we can set the JTable to null or set its TableColumnModel to null before setting JTable to null, we found that the TableColumns in the TableColumnModel are still on the heap using Eclipse's memory analyzer or Netbean's profiler. We were surprised that neither tool told us which object held them in memory, though.
We have looked on the web for a while. First we thought the "final" keyword might be the problem but using an instance variable for the class in which the method "invokeThread" resides did not help. We have seen other people reporting similar issues with other swing components but has yet to find a solution or a work-around that works for us.
Thanks in advance for your help.
John

Thanks, PhHein. If we can bribe the GC, we will :-).
I guess my question is whether this is something we need to do to ensure that GC will collect the memory once we set the JTable to null. From what we gathered on the web, one possible reason for the GC not to touch the JTable is that there is another reference to the JTable object (or its sub-components?) that we are not aware of. We saw a few posts mentioning the listeners added by a static object. Don't know if it applies to our situation because although we did not add any listener this way, we don't know whether by using JTable and TableColumnModel, a listener is added for us by a static object.
With limited exposure to the development community, we don't know the scope of the issue we encountered. We have seen a few bug reports in sun development network but they were quite old. If this is a well-known issue for Swing components that is yet to be fully addressed, then we have to bite the bullet for now. If there is a solution either offered by sun or by some experts, we will be grateful if you guys can point the way.
Best,
John

Removing array from memory

I have an 2Darray (typically of ~ 1000 elements) that stores data to plot.
I did : Data Operations > Empty Array & then Data Operations > Make Current Value Default.
Sometimes, I need to re-calculate a new array of values, so I use the Invoke Node > Reinitialize to Default.
It doesn't seem to clear the values from the array. Restarting the
entire VI doesn't empty the array - only restarting LabView does.
Any ideas why this is happening ?
Thanks,
ak

Hi ak,
The best way is to use "Initialize Array" from the array palette. You have to wire an element to define the array type. If you know the array size, you can wire it, if you don't know it, you have to append new data to your array with "Build Array" function (also in the array palette). Build array is a resizable function.
Nevertheless it is better to fix the array size once for all because if the array size is getting too big, labview allocate entire new space for it.
Cheers.
Doc-Doc
http://www.machinevision.ch
http://visionindustrielle.ch
Please take time to rate this answer
Attachments:
init and build array example.vi ‏7 KB

Removing control from panel

I have a panel which dynamically get filled with controls, but I need to reuse that panel for a new set. is there a way to clear its contents so that the new set can be put there?

Have a look at the CardLayout.

ACE - removing script from ACE memory

Hi,
I played with scripted probes and now I can't remove script from ACE memory... because I have no 'script file NN SCRIPT_NAME' in my running config, therefore I can't remove script from memory with 'no script file NN'.
When I try delete file from disk0: and upload modified file (with the same file name), 'sh file disk0:SCRIPT_NAME' shows correct file content, but 'sh script code SCRIPT_NAME' is wrong (because script is loaded in memory).
How it's possible to unload script from memory if no 'script file NN script_name' in running config exists?
martin

Martin,
this is a bug.
The 'no script file ' should be enough to remove the script from memory.
I checked the code and this is something that can easily be fixed.
I will submit a new ddts.
Thanks for pointing this issue to us.
Gilles.

How to remove/destroy previous object from memory

hi guys, I am getting problem of memory of having repeating object.
Below is my code.
import flash.system.System;
var counter:Number=0;
var systemMemory:TextField=new TextField();
systemMemory.x=200;
stage.addEventListener(Event.ENTER_FRAME,showNext);
function showNext(event:Event){
    var myTxt:TextField=new TextField();
    myTxt.text=counter.toString();
    myTxt.width=100;
    myTxt.height=20;
    myTxt.x=Math.random()*100;
    systemMemory.text="Total Memory Used :"+System.totalMemory.toString();
    systemMemory.width=300;
    addChild(systemMemory);
    addChild(myTxt);
    counter++;
Above code does repeat textField Object continuously. Now I want to destroy previous created textField Object. So that my memory will not be hang. I got some where in the blog that with System.gc() could clear garbage collection. But currently I am not working with system.gc any more I want to clear previous object in programatically way. Is there any way that I could destroy previous created object ?

ok, thanks for your kind replay. Above is my test case. Actually, I need to do show 4 texfield in each FRAME_ENTER with different text properties's value + previous textFields should be remove and comes next 4 textField.
import flash.text.TextField;
import flash.display.Sprite;
import flash.display.Stage;
import flash.events.Event;
import flash.system.System;
var frameNo:Number=0;
var txtFieldGroup:Array=new Array();
var mem:TextField=new TextField();
stage.addEventListener(Event.ENTER_FRAME,showTxtFields);
function showTxtFields(event:Event):void{
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        /*txtFieldGroup[frameNo][i]=frameNo.toString()+":"+i.toString();*/
        txtFieldGroup[i]=new TextField();
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        addChild(txtFieldGroup[i]);
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    mem.text="System Memory: "+System.totalMemory;
    mem.x=250;
    mem.width=300;
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    // Frame No increment
    frameNo++;
here, from above script it created 4 txtObject in each frame no. I have clear array in each frame no. But I could not remove textFieldObject from CPU Memory. As you can see textField object of mem. As you say in earlier post making 4 different textfield at initialy is nice option to control over CPU Memory. Is there any technique so that I could remove previous created textField object because . I am also having problem why my textfields are shows more than 4. I was expecting only 4 textField in each frame. Please you suggestion is required. Thanks for studying my confusion.

How do I select a control based on another control's selection and how do I remove enumerations from a control?

Hi everyone,
I have a question and I *think* the answer may be the new active controls, so here goes: I have a control which contains a variety of enumerated items - essentially a typedef enum. I may have up to several dozen items in this control, like this:
Position - 1
Current - 2
Pressure - 3
Temperature - 4
Duty Cycle - 5, etc.
I also have a 2nd control (actually a set of controls) that refer to the indices of the above control. For example, if I "Position" chosen, I wish the 2nd control to appear that refers to position - an enumeration with "X axis, Y axis, etc." If I select "Temperature", I wish the 2nd control to appear that refers to temperature - a different typedef'd enum - "Inlet, Outlet, Air, Water, etc."
How do I do this?
Lastly, the first enum with ALL of the items, pressure, current, etc. does not need to be used. For certain configurations, I wish to eliminate, say the 1st and 3rd item - I don't wish to just gray them out, I wish to remove them from the enumeration, WITHOUT changing their enumerated value. Perhaps I need to write the resultant enum into a temporary ring enum - any ideas?
Thanks,
Jason

Unfortunately, you cannot edit the list of enums during runtime, only during edit mode. You can use a ring control however. Then you can use the Strings[] property to set the selections to whatever you want depending upon the 1st enum. See attached vi.
- tbob
Inventor of the WORM Global
Attachments:
ChangeRing.vi ‏52 KB

Remove / unload external swf file(s) from the main flash file and load a new swf file and garbage collection from memory.

I can't seem to remove / unload the external swf files e.g when the carousel.swf (portfolio) is displayed and I press the about button the about content is overlapping the carousel (portfolio) . How can I remove / unload an external swf file from the main flash file and load a new swf file, while at the same time removing garbage collection from memory?
This is the error message(s) I am receiving: "TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/removeChild()
at index_fla::MainTimeline/Down3()"
import nl.demonsters.debugger.MonsterDebugger;
var d:MonsterDebugger=new MonsterDebugger(this);
stage.scaleMode=StageScaleMode.NO_SCALE;
stage.align=StageAlign.TOP_LEFT;
stage.addEventListener(Event.RESIZE, resizeHandler);
// loader is the loader for portfolio page swf
var loader:Loader;
var loader2:Loader;
var loader3:Loader;
var loader1:Loader;
// resize content
function resizeHandler(event:Event):void {
    // resizes portfolio page to center
loader.x = (stage.stageWidth - loader.width) * .5;
loader.y = (stage.stageHeight - loader.height) * .5;
// resizes about page to center
loader3.x = (stage.stageWidth - 482) * .5 - 260;
loader3.y = (stage.stageHeight - 492) * .5 - 140;
/*loader2.x = (stage.stageWidth - 658.65) * .5;
loader2.y = (stage.stageHeight - 551.45) * .5;*/
addEventListener(Event.ENTER_FRAME, onEnterFrame,false, 0, true);
function onEnterFrame(ev:Event):void {
var requesterb:URLRequest=new URLRequest("carouselLoader.swf");
loader = null;
loader = new Loader();
loader.name ="carousel1"
//adds gallery.swf to stage at begining of movie
loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader.load(requesterb);
} catch (error:SecurityError) {
trace(error);
addChild(loader);
loader.x = (stage.stageWidth - 739) * .5;
loader.y = (stage.stageHeight - 500) * .5;
// stop gallery.swf from duplication over and over again on enter frame
removeEventListener(Event.ENTER_FRAME, onEnterFrame);
//PORTFOLIO BUTTON
//adds eventlistner so that gallery.swf can be loaded
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
function Down(event:MouseEvent):void {
// re adds listener for contact.swf and about.swf
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
//unloads gallery.swf from enter frame if users presses portfolio button in nav
var requester:URLRequest=new URLRequest("carouselLoader.swf");
    loader = null;
loader = new Loader();
loader.name ="carousel"
loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader);
loader.x = (stage.stageWidth - 739) * .5;
loader.y = (stage.stageHeight - 500) * .5;
removeChild( getChildByName("about") );
removeChild( getChildByName("carousel1") );
// remove eventlistner and prevents duplication of gallery.swf
MovieClip(root).nav.portfolio.removeEventListener(MouseEvent.MOUSE_DOWN, Down);
//INFORMATION BUTTON
//adds eventlistner so that info.swf can be loaded
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
function Down1(event:MouseEvent):void {
//this re-adds the EventListener for portfolio so that end user can view again if they wish.
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
var requester:URLRequest=new URLRequest("contactLoader.swf");
loader2 = null;
loader2 = new Loader();
loader2.name ="contact"
loader2.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader2.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader2);
loader2.x = (stage.stageWidth - 658.65) * .5;
loader2.y = (stage.stageHeight - 551.45) * .5;
// remove eventlistner and prevents duplication of info.swf
MovieClip(root).nav.info.removeEventListener(MouseEvent.MOUSE_DOWN, Down1);
//ABOUT BUTTON
//adds eventlistner so that info.swf can be loaded
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
function Down3(event:MouseEvent):void {
//this re-adds the EventListener for portfolio so that end user can view again if they wish.
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
var requester:URLRequest=new URLRequest("aboutLoader.swf");
loader3 = null;
loader3 = new Loader();
loader3.name ="about"
loader3.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader3.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader3);
loader3.x = (stage.stageWidth - 482) * .5 - 260;
loader3.y = (stage.stageHeight - 492) * .5 - 140;
removeChild( getChildByName("carousel") );
removeChild( getChildByName("carousel1") );
// remove eventlistner and prevents duplication of info.swf
MovieClip(root).nav.about.removeEventListener(MouseEvent.MOUSE_DOWN, Down3);
stop();

Andrei1,
Thank you for the helpful advice. I made the changes as you suggested but I am receiving a #1009 error message even though my site is working the way I wan it to work. I would still like to fix the errors so that my site runs and error free. This is the error I am receiving:
"TypeError: Error #1009: Cannot access a property or method of a null object reference."
I'm sure this is not the best method to unload loaders and I am guessing this is why I am receiving the following error message.
     loader.unload();
     loader2.unload();
     loader3.unload();
I also tried creating a function to unload the loader but received the same error message and my portfolio swf was not showing at all.
     function killLoad():void{
     try { loader.close(); loader2.close; loader3.close;} catch (e:*) {}
     loader.unload(); loader2.unload(); loader3.unload();
I have a question regarding suggestion you made to set Mouse Event to "null". What does this do setting the MouseEvent do exactly? Also, since I've set the MouseEvent to null do I also have to set the loader to null? e.g.
---- Here is my updated code ----
// variable for external loaders
var loader:Loader;
var loader1:Loader;
var loader2:Loader;
var loader3:Loader;
// makes borders resize with browser size
function resizeHandler(event:Event):void {
// resizes portfolio page to center
     loader.x = (stage.stageWidth - loader.width) * .5;
     loader.y = (stage.stageHeight - loader.height) * .5;
// resizes about page to center
     loader3.x = (stage.stageWidth - 482) * .5 - 260;
     loader3.y = (stage.stageHeight - 492) * .5 - 140;
//adds gallery.swf to stage at begining of moviie
     Down();
//PORTFOLIO BUTTON
//adds eventlistner so that gallery.swf can be loaded
     MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
function Down(event:MouseEvent = null):void {
// re adds listener for contact.swf and about.swf
     MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
     MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
//unloads gallery.swf from enter frame if users presses portfolio button in nav
     var requester:URLRequest=new URLRequest("carouselLoader.swf");
     loader = new Loader();
     loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
     function ioError(event:IOErrorEvent):void {
     trace(event);
     try {
     loader.load(requester);
     } catch (error:SecurityError) {
     trace(error);
     this.addChild(loader);
     loader.x = (stage.stageWidth - 739) * .5;
     loader.y = (stage.stageHeight - 500) * .5;
// sure this is not the best way to do this - but it is unload external swfs
     loader.unload();
     loader2.unload();
     loader3.unload();
// remove eventlistner and prevents duplication of gallery.swf
     MovieClip(root).nav.portfolio.removeEventListener(MouseEvent.MOUSE_DOWN, Down);
//INFORMATION BUTTON
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     MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
     function Down1(event:MouseEvent = null):void {
     //this re-adds the EventListener for portfolio so that end user can view again if they wish.
     MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
     MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
     var requester:URLRequest=new URLRequest("contactLoader.swf");
     loader2 = null;
     loader2 = new Loader();
     loader2.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
     function ioError(event:IOErrorEvent):void {
     trace(event);
     try {
     loader2.load(requester);
}      catch (error:SecurityError) {
     trace(error);
     addChild(loader2);
     loader2.x = (stage.stageWidth - 658.65) * .5;
     loader2.y = (stage.stageHeight - 551.45) * .5;
loader.unload();
loader2.unload();
loader3.unload();
     // remove eventlistner and prevents duplication of info.swf
     MovieClip(root).nav.info.removeEventListener(MouseEvent.MOUSE_DOWN, Down1);
//ABOUT BUTTON
     //adds eventlistner so that info.swf can be loaded
     MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
     function Down3(event:MouseEvent = null):void {
     //this re-adds the EventListener for portfolio so that end user can view again if they wish.
     MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
     MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
     var requester:URLRequest=new URLRequest("aboutLoader.swf");
     loader3 = null;
     loader3 = new Loader();
     loader3.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
     function ioError(event:IOErrorEvent):void {
     trace(event);
     try {
     loader3.load(requester);
}      catch (error:SecurityError) {
     trace(error);
     addChild(loader3);
     loader3.x = (stage.stageWidth - 482) * .5 - 260;
     loader3.y = (stage.stageHeight - 492) * .5 - 140;
     loader.unload();
     loader2.unload();
     loader3.unload();
     // remove eventlistner and prevents duplication of info.swf
     MovieClip(root).nav.about.removeEventListener(MouseEvent.MOUSE_DOWN, Down3);
     stop();

10.4.9 removes Brightness Control from System Preferences?!

Has anyone else noticed that the Intel 10.4.9 update has removed Brightness Control from their System Prefs?!
maybe it's just mine... seems unlikely!!!

No, mine still has it. Perhaps it no longer thinks you can adjust the brightness. You may try the "standard" repair techniques to see if it will come back: Repair permissions, repair the disk (you must start up from installer DVD or use Safe Mode--which takes a while to boot because it is checking the disk), and then running the combo updater instead of Software Update.
1.8 SP G5/iMac G4 FP/MBP 2.33/PB G3 Pismo Mac OS X (10.4.9) XLR8 G4 Upgrade for Pismo

How to remove the Object from memory.

Hello.
Flash file that i made with Flex Builder uses memory too
much.
Look at the next example source code.
var testCan:Canvas = new Canvas();
this.addChild(testCan);
this.removeChild(testCan);
testCan = null;
but just memory usage still goes up, is not freed instantly.
so if i load the large flash files on my web browser,
after 5 munites or something, the web browser is down.
How to remove the object from memory immediately without
delay?

It's all about the Garbage Collector ..
There is a nice write up here :
http://www.gskinner.com/blog/archives/2006/06/as3_resource_ma.html

Remove Control from Memory

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