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POobjective c - getting null values
 

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  1. POobjective c - getting null values
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    <p>I have been stuck on this for some time now but whats happening is that when the request comes back from mysql there is a null value but how do i check that a null value has hit my condition so that i dont store this value in the array. The code is below</p> <p>The error i keep getting is -[NSNull isEqualToString:]: unrecognized and im trying to bind the array inside a tableview</p> <pre><code>- (void)viewDidLoad { JobAddSiteAppDelegate *ja = (JobAddSiteAppDelegate *)[[UIApplication sharedApplication] delegate]; tempArray = [[NSMutableArray alloc] init]; NSString *strURL = [NSString stringWithFormat:@"http://www.bestitjobs.co.uk/appresults3.php", ""]; NSData *nsData = [NSData dataWithContentsOfURL:[NSURL URLWithString: strURL]]; //NSLog(@"JSON: %@", nsData); //NSString *strResult = [[[NSString alloc] initWithData:nsData encoding:NSUTF8StringEncoding] autorelease]; //NSLog(@"Result: %@",strResult); //NSError *e = nil; JSONDecoder* decoder = [[JSONDecoder alloc] init]; NSDictionary* listDictionary = [nsData objectFromJSONData]; NSArray* people =[listDictionary objectForKey:@"jobs"]; for (NSDictionary *person in people) { NSLog(@"people %@",people); if([person objectForKey:@"position"] != [NSNull class]) { NSString *position = [person objectForKey:@"position"]; NSLog(@"position %@",position); [tempArray addObject: position]; } } self.listData = tempArray; [tempArray release]; [listData release]; [super viewDidLoad]; } </code></pre> <p>Error</p> <p>2012-12-06 12:22:11.314 JobAddSite[7718:207] position Senior Network and Systems Consultant 2012-12-06 12:22:11.316 JobAddSite[7718:207] position SAP Business One / SAP B1 Consultant London 2012-12-06 12:22:11.317 JobAddSite[7718:207] position Business Development Manager - Market Leading IT Company 2012-12-06 12:22:11.318 JobAddSite[7718:207] -[NSNull isEqualToString:]: unrecognized selector sent to instance 0xe565e8 2012-12-06 12:22:11.321 JobAddSite[7718:207] <strong>* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSNull isEqualToString:]: unrecognized selector sent to instance 0xe565e8' *</strong> Call stack at first throw: ( 0 CoreFoundation 0x00de95a9 <strong>exceptionPreprocess + 185 1 libobjc.A.dylib 0x00f3d313 objc_exception_throw + 44 2 CoreFoundation 0x00deb0bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x00d5a966 __<em>forwarding</em></strong> + 966 4 CoreFoundation 0x00d5a522 _CF_forwarding_prep_0 + 50 5 JobAddSite 0x000024cd -[ResultViewController viewDidLoad] + 604 6 UIKit 0x00389089 -[UIViewController view] + 179 7 UIKit 0x0038aa3d -[UIViewController viewControllerForRotation] + 63 8 UIKit 0x00386988 -[UIViewController _visibleView] + 90 9 UIKit 0x0062893c -[UIClientRotationContext initWithClient:toOrientation:duration:andWindow:] + 354 10 UIKit 0x0030081e -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 954 11 UIKit 0x00588619 -[UIWindowController transition:fromViewController:toViewController:target:didEndSelector:] + 1381 12 UIKit 0x0038d65d -[UIViewController presentModalViewController:withTransition:] + 3478 13 JobAddSite 0x0000213f -[JobAddSiteViewController search] + 270 14 UIKit 0x002d94fd -[UIApplication sendAction:to:from:forEvent:] + 119 15 UIKit 0x00369799 -[UIControl sendAction:to:forEvent:] + 67 16 UIKit 0x0036bc2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 17 UIKit 0x0036a7d8 -[UIControl touchesEnded:withEvent:] + 458 18 UIKit 0x002fdded -[UIWindow _sendTouchesForEvent:] + 567 19 UIKit 0x002dec37 -[UIApplication sendEvent:] + 447 20 UIKit 0x002e3f2e _UIApplicationHandleEvent + 7576 21 GraphicsServices 0x01741992 PurpleEventCallback + 1550 22 CoreFoundation 0x00dca944 <strong>CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION</strong> + 52 23 CoreFoundation 0x00d2acf7 __CFRunLoopDoSource1 + 215 24 CoreFoundation 0x00d27f83 __CFRunLoopRun + 979 25 CoreFoundation 0x00d27840 CFRunLoopRunSpecific + 208 26 CoreFoundation 0x00d27761 CFRunLoopRunInMode + 97 27 GraphicsServices 0x017401c4 GSEventRunModal + 217 28 GraphicsServices 0x01740289 GSEventRun + 115 29 UIKit 0x002e7c93 UIApplicationMain + 1160 30 JobAddSite 0x00001dec main + 102 31 JobAddSite 0x00001d7d start + 53 ) terminate called after throwing an instance of 'NSException'</p>
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    1. COwhat json formatter you used?
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    2. COPREMKUMAR, im using JSONKit
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    3. COIt is also same like SBJson after get response all are same
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