Re: Getting Image from Web and Displaying it problem
Re: Getting Image from Web and Displaying it problem
- Subject: Re: Getting Image from Web and Displaying it problem
- From: "John Tsombakos" <email@hidden>
- Date: Fri, 24 Jan 2003 11:17:38 -0500
I did change back to the original code and it does
refresh. I still am getting the "..not enough scanlines.."
message occasionally. So the question on how to deal with
that is still open.
Also, in the original code, I change the relevent bits to:
[voyagerImage setImage:image];
[image release]; // added
[imageData release]; // added but...
With the second release in there, the app blew chunks when
I ran it (exited due to signal 11 (SIGSEGV). I removed the
second release and it ran fine.
Ok now I'm back to being lost about retain/release. I
displayed the retainCount of the imageData object and
after the line
NSImage* image = [[NSImage alloc] initWith
Data:imageData];
the count of imageData goes to 2. Looking at the docs of
resourceDataUsingCache: doesn't tell me whether or not I
need to release or not, neithe rdoes initWithData.
I am assuming (not to confidently) that the string
(NSString* string = @"xxx") is autoreleased and I don't
have to worry about it?
Thanks again (again)!
On Fri, 24 Jan 2003 16:44:04 +0100
David Remahl <email@hidden> wrote:
Oh, I didn't consider that. initWithContentsOfURL:
apparently uses the cache. You should go back to using
your old method of first loading an NSData and then
initing the image with that.
You are doing the right thing, releasing the image after
setting the image view image. The image view will retain
the image, so it is safe for you to release it. Since you
alloced it, you need to release it.
/ Regards, David
Hmm. Spoke too soon. The below code works - the first
time. When I
click the button to reload the image, it doesn't load the
updated
image (which I know has changed by looking at the
original website).
The old code does refresh the image. It must be caching
it somewhere
and not reloading it.
On Fri, 24 Jan 2003 14:27:33 +0100
David Remahl <email@hidden> wrote:
Nope, it is perfectly ok to do:
NSString *str = @"whatever";
I'm not sure what the original poster's problem might be.
The code
looks ok. Are you sure the image you are downloading
isn't corrupt?
You could also try;
NSImage *image = [[NSImage alloc]
initWithContentsOfURL:[NSURL
URLWithString@"http://www.rccl.com/rc/image/vywebcam.jpg";]];
The image will then be downloaded from the URL
automatically.
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