Re: stringWithContentsOfURL with resulting error 256
Re: stringWithContentsOfURL with resulting error 256
- Subject: Re: stringWithContentsOfURL with resulting error 256
- From: John Horigan <email@hidden>
- Date: Thu, 22 Oct 2009 11:11:51 -0700
Try using curl (the command-line utility) to see _exactly_ what Cocoa
gets from the server when it accesses that URL. The server could be
doing something that confuses Cocoa but which PHP and Safari handle
properly.
-- john
On Oct 22, 2009, at 8:52 AM, Jens Alfke wrote:
On Oct 22, 2009, at 7:16 AM, James Lin wrote:
NSString *result = [NSString stringWithContentsOfURL:theURL
encoding:NSUTF8StringEncoding error:&error];
However, the result comes back with an NSError as the following:
Error Domain=NSCocoaErrorDomain Code=256 UserInfo=0x15d7b0
"Operation could not be completed. (Cocoa error 256.)
which is a NSFileReadUnknownError = 256.
BUT! The same URL string works perfectly in a Safari window and the
PHP script executes fine when accessed from Safari...
That's a weird error I haven't seen before — looks like a generic
"duh, something went wrong" fallback.
My first guess is that NSString can't decode the URL response into a
string due to encoding issues; maybe the content uses an encoding
that's incompatible with UTF-8? I would start trying lower-level
calls to find the point where it starts to work.
-[NSString stringWithContentsOfURL:usedEncoding:error:]
-[NSData dataWithContentsOfURL:...]
-[NSURLConnection sendSynchronousRequest:...]
Note that in most cases you don't want to use this type of
synchronous call on a remote URL because it blocks the thread for an
arbitrary amount of time. The usual Cocoa style is to use an
asynchronous request via NSURLRequest.
—Jens_______________________________________________
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