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 08:39:53 -0500
The image is coming from a webcam, and it's possible that
the image has problems on the sending side. I know when I
call it up in a browser, sometimes it only displays about
3/4 of the image, so I assume there are problems on the
sending end. (the original web page is coming from
<
http://www.kroooz-cams.com/voyager/voyager.htm> with the
image coming from another site - yeah, I'm going to be
there in about 2 weeks :) ) So I guess the question would
be, how can I detect that the complete image isn't
available, instead of having some mysterious error line
show up in the console and nothing display?
Thanks.
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.
Perhaps the problem is that the image is replaced during
the file transfer? I mean, if it comes from a webcam,
that could be a possibility.
/ Regards, David
On Friday, January 24, 2003, at 12:46 PM, mw wrote:
I didn't think it was allowed to use a line like
NSString* string =
@"http://www.rccl.com/rc/image/vywebcam.jpg";;
Wouldn't it have to be
NSString* string = [[NSString alloc]
initWithString:@"http://www.rccl.com/rc/image/vywebcam.jpg";];
mw
On 1/24/03 12:22 AM, "John Tsombakos"
<email@hidden> wrote:
I have a small app that is just supposed to download an
image from the
web and display it in an ImageView. I have an image view
in a window,
with a button and everything is wired up correctly.
(Which is an
accomplishment in itself, as I'm on the newbie side of
Cocoa). The
method the button calls when it's clicked is:
- (IBAction)getImage:(id)sender
{
NSString* string =
@"http://www.rccl.com/rc/image/vywebcam.jpg";;
if (string) {
NSURL* url = [NSURL URLWithString:string];
if (url) {
NSData *imageData = [url
resourceDataUsingCache:NO];
if (imageData) {
NSImage* image = [[NSImage alloc]
initWithData:imageData]; //****
if (image) {
[voyagerImage setImage:image];
} else {
NSLog(@"couldn't init image from
imageData
%@\nLoaded from %@\nReferenced by %@\nwith url %@",
imageData, url,
string);
}
} else {
NSLog(@"can't init imageData from url %@\n
with string
%@", url, string);
}
} else {
NSLog(@"can't init url from string %@", url);
}
} else {
NSLog(@"couldn't get a string from sender %@",
sender);
}
}
Now, it sometimes works, but at the line marked with ****
it will
generate a message in the debug pane or put the line in
the console:
"Application transferred too few scanlines".
I have no idea why! Is this the best way to do this?
Thanks!
jt
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