Getting NSData object from NSImage.

I want NSData object from NSImage object.
I looked in documentation and i didn't found any method to get back the data from image object. is it possible to retrieve NSData from NSImage ?
Thanks....
Message was edited by: xmax

Somewhat ..
- (NSData *)TIFFRepresentation
Eric

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Getting an object from HttpSession...

Hi all,
I am stuck which is according to me is very obvious...please correct me if I am wrong.
I have a java.util.ArrayList object in my HttpSession object.
Now in my helper class to which the request is passed from the servlet I am extracting this ArrayList object in one ArrayList object and putting it into the HashMap. After this, I am again extracting this ArrayList object from the HttpSession and assigning it to a newly created ArrayList object in my helper class. Now I am passing this newly created ArrayList object to a method. This method after processing changes this ArrayList object. And finally I am putting this changed ArrayList object in the HashMap I created earlier.
After doing all this, when I am trying to extract and print these ArrayList Objects from the session object...I found my first ArrayList object has also been affected by the same change as the second one. The expected result was only the second object will be changed. I am stuck with this.
I know it has something to do with references....but I am not able to understand that when I am trying to create two new copies by extracting an object from the Session...and changing one how is my second object getting affected. Any help will be appriciated.
The code for this is as follows:
"phSessionState" is a collection object in HttpSession which holds all the other objects. We are not putting different objects directly in the HttpSession.
"LineObject" is a simple JavaBean kind of class with gettrs and setters
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stagedLineObjects.put("OriginalList", originalList);
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ArrayList tempList = (ArrayList)phSessionState.getData("lineObjectList");
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updateLineObjectList(tempList, request);
stagedLineObjects.put("UpdatedList", tempList);
//Trying to get the objects from the HashMap and print
System.out.println("Retriving OriginalList...");
ArrayList List1 = (ArrayList)stagedLineObjects.get("OriginalList");
for(int i=0; i<List1.size(); i++)
 LineObject lo = (LineObject)List1.get(i);
 System.out.println(lo.getUserID() + "\t" + lo.getPassword()
+ "\t" + lo.getFirstName() + "\t" + lo.getMiddleName() + "\t" +
lo.getLastName());
System.out.println("Retriving UpdatedList...");
ArrayList List2 = (ArrayList)stagedLineObjects.get("UpdatedList");
for(int i=0; i<List2.size(); i++)
 LineObject lo = (LineObject)List2.get(i);
 System.out.println(lo.getUserID() + "\t" + lo.getPassword()
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Waiting for your valuable help...
Thanks & Regards,
Gauz

You must remember that objects are passed by reference. So when you are passing around your ArrayList, you are actually passing a reference to the ArrayList. In other words, there exists one instance of your specific ArrayList in memory and what you are passing around are copies of the "reference" to that memory location.
If you want to pass a copy of your ArrayList, you can create a copy of the ArrayList and pass the reference to that new copy. One way to do this is as follows:ArrayList originalList = new ArrayList();
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// Original's size is 2
// Copy's size is 3Please keep in mind that the objects within the ArrayList are also being passed by reference. So if you modify an object within originalList, those modifications will be reflected in the same object found in copyOfList.
For example,StringBuffer sb = (StringBuffer)copyOfList.get(1);
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System.out.println("Copy's value is " + sbFromCopy.toString());
//Your output should read
// Original's value is object1:modified
// Copy's value is object1:modifiedThis is because you made a copy of the ArrayList, but not a copy of each object within the ArrayList. So you actually have two seperate copies of ArrayList but they are referencing the same two objects in positions 1 and 2. The object in position 3 exists only in copyOfList.
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