Save image into cache ?

[fatter]

Hi,

I have been talking about how to save text into cache in this topice :
Apple - Support - Discussions - How to save data in order to reuse on ...

Now I would like to know how should I proceed to save an PNG or JPG that is online into the iPhone.

This is the wished process

My App launches, retrieves an XML file from a web server.
In the XML file there is string that is the image URL, (example : http://www.google.es/images/nav_logo4.png)

The image is stored into the iPhone's cache.
Then I use this image as an UIImageView in my View.

This my question

1. Once I have the URL, how do I download and save into cache. What should I use ?

2. How to access to that cached data then ?

[Jume]

check following:

NSData
+ (id)dataWithContentsOfURLNSURL *)aURL

and

UIImage
+ (UIImage *)imageWithDataNSData *)data

[teras]

I have some problems with memory management.

I thought to use the init- messages instead, like this:

	NSData * data = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:myURL]];
	UIImage *img = [[UIImage alloc] initWithData:data];
	[myImageView setImage:img];
	[img dealloc];
	[data dealloc];

If I use it like this, when code reaches [data dealloc] it segfaults.

Why is this happening?

[tkilmer]

You do not ever call dealloc on an object. You should use release instead.

[teras]

Originally Posted by tkilmer

You do not ever call dealloc on an object. You should use release instead.

Thank you!
I'm still a newbie in memory management in Obj-c

[estupefactika]

One question, is the cache persistent? or empty when app terminates?

What happen when you open your app again? Are still images in cache?