We are seeing quite an odd situation in our app. When running the app on an
iPhone 4 with iOS 4.3.5 (other combinations also exhibit this behavior but I
don't have the exact details at the moment) and forcing data traffic to go over
the cell network, our URL data loading calls are often not returning the entire
set of bytes. Here is the code:
Option 1: Basic
NSData* data = [NSData dataWithContentsOfURL:mURL];
Option 2: Check for return error
NSError* error = nil;
NSData* data = [[[NSData alloc] initWithContentsOfURL:mURL 0
error:&error] autorelease];
Option 3: Use NSURLConnection
NSMutableURLRequest* request = [NSMutableURLRequest
requestWithURL:mURL];
NSHTTPURLResponse* response = nil;
NSError* error = nil;
NSData* data = [NSURLConnection sendSynchronousRequest:request
returningResponse:&response error:&error];
NSInteger responseStatus = [response statusCode];
NSLog(@"response code: %d", responseStatus);
NSLog(@"response headers: %@", [response allHeaderFields]);
Returns the following info every time:
2012-08-08 11:54:20.815 App[994:8207] response code: 200
2012-08-08 11:54:20.817 App[994:8207] response headers: {
"Accept-Ranges" = bytes;
"Cache-Control" = "no-store, no-cache, must-revalidate, post-check=0,
pre-check=0";
"Content-Encoding" = gzip;
"Content-Length" = 87187;
"Content-Type" = "application/pdf";
Date = "Wed, 08 Aug 2012 18:54:20 GMT";
Expires = "Thu, 19 Nov 1981 08:52:00 GMT";
P3p = "CP=\"NOI DSP COR CUR IVD OTPi OUR STP INT\",
policyref=\"/w3c/p3p.xml\"";
Pragma = "no-cache";
Server = "Apache/2.2.3 (CentOS)";
"Set-Cookie" = "fromov=deleted; expires=Tue, 09-Aug-2011 18:54:19 GMT;
path=/";
Vary = "Accept-Encoding";
}
Option 4: Try on main thread
NSMutableData* storageData = [NSMutableData data];
[self performSelectorOnMainThread:@selector(loadURL:) withObject:
storageData waitUntilDone:YES];
- (void) loadURL:(NSMutableData*) storageData
{
NSData* data = [NSData dataWithContentsOfURL:mURL];
[storageData appendData:data];
}
What we see is that occasionally (25% of the time?) the app loads all 87187
bytes, but the rest of the time, the app loads less data and no error or any
other condition is ever returned.
Does anyone have any idea what could be going wrong and perhaps what is the
recommended approach to consistently and correctly loading data over the cell
network?
-Stevo Brock
Sunset Magicwerks, LLC
www.sunsetmagicwerks.com
818-609-0258
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