Re: <newbie> Can't use NSImage initWithContentsOfURL:
Re: <newbie> Can't use NSImage initWithContentsOfURL:
- Subject: Re: <newbie> Can't use NSImage initWithContentsOfURL:
- From: Steve Bird <email@hidden>
- Date: Tue, 20 Nov 2001 20:23:47 -0500
--- In other words, the *UNIVERSAL* resource locator only works
*UNIVERSALLY* with certain selected class methods.
Hmmmm.
One would think the docs for the method in question would explain that
simple fact.
I thought it was called a *UNIVERSAL* resource locator for a reason...
Thanks, Dan
On Tuesday, November 20, 2001, at 05:42 , Dan Wood wrote:
Inexplicably, several classes that read from URLs only work with local
(file://) URLs. Try using NSURL or NSURLHandle to get some NSData and
go from there.
On Monday, November 19, 2001, at 01:36 PM, Steve Bird wrote:
Why does case 'A' work and case 'B' fail (the returned image is nil) ?
myURLA = [ NSURL
URLWithString:@"http://www.Culverson.com/WebTealLogoWithMotto.jpg"; ];
myNSDataA = [[[ NSData alloc] initWithContentsOfURL: myURLA ]
autorelease];
myNSImageA = [[[NSImage alloc] initWithData: myNSDataA ] autorelease]
;
[myNSImageViewA setImage: myNSImageA ];
myURLB = [ NSURL
URLWithString:@"http://www.Culverson.com/WebTealLogoWithMotto.jpg"; ];
myNSImageB = [[[NSImage alloc] initWithContentsOfURL: myURLB ]
autorelease];
[myNSImageViewB setImage: myNSImageB ];
In other words, why do I have to go through an NSDATA step?
The URL's are known valid, as is evidenced by the A case working.
The NSIMAGE docs (Yes, I have RTFM) say this:
----------------------
- (id)initWithContentsOfURL:(NSURL *)anURL
Initializes the receiver, a newly allocated NSImage instance, with the
contents of the URL anURL.
After finishing the initialization, this method returns self. However,
if at least one image representation can't be created from the contents
of anURL, the receiver is freed and nil is returned.
----------------------
The NSDATA docs say this:
----------------------
- (id)initWithContentsOfURL:(NSURL *)anURL
Description forthcoming.
----------------------
Since NIL is being returned in the failing case, one answer would be
that the NSIMAGE can't figure out the type.
But if it can't figure out the type from the URL, then why can it do it
from the NSDATA?
I've tried other URL values, same behavior.
If I use [[NSImage alloc] initWithContentsOfFile: @"WebTealLogoWithMotto.
jpg ], all is as expected.
Any clues?
-------------------------------------------------------------------------------------
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
www.Culverson.com (toll free) 1-877-676-8175
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--
Dan Wood
email@hidden
http://www.karelia.com/
http://www.bikealameda.org/
Mac OS X Developer: Online Resume: http://www.karelia.com/resume.html