NSThread Showing SIGABRT

Question

I'm new to IOS I need to implement NSThread in my program, but when it invoked it shows an SIGABRT error. my current code is given below

XMLParser.m

-(void)loadXML
{
    categories =[[NSMutableArray alloc]init];
    NSString *filepath =[[NSBundle mainBundle]pathForResource:@"cd_catalog" ofType:@"xml"];
    NSData *data =[NSData dataWithContentsOfFile:filepath];
    parser=[[NSXMLParser alloc]initWithData:data];
    parser.delegate =self;
    [parser parse];
}

ViewController.m

- (void)viewDidLoad
{
    xmlParser =[[XMLParser alloc]init];
    NSThread *myThread =[[NSThread alloc]initWithTarget:self selector:@selector(loadXML) object:nil];
    [myThread start];
    [super viewDidLoad];
}

please tell me what is wrong with my program

Are you using ARC and where is your application crashing after `viewDidLoad` of inside `viewDidLoad` — Inder Kumar Rathore, Mar 18 '13 at 05:22
Yes I'm using ARC and its crashing when it reaches the nsthread implementation — Optimus, Mar 18 '13 at 05:26
It can be due to the run loop. Can you start run loop inside `loadXML`? — Inder Kumar Rathore, Mar 18 '13 at 05:28
how...I dont know how to implement that as I said I'm trying to study this my self — Optimus, Mar 18 '13 at 05:31
@AlenJoy You need to provide a lot more detail about the error. Most likely you are getting a message about an invalid selector being called on an object of a certain type. — rmaddy, Mar 18 '13 at 05:37

score 2 · Accepted Answer · answered Mar 18 '13 at 05:29

Use this code to solve your problem...

ViewController.m

- (void)viewDidLoad
{
    NSThread *myThread =[[NSThread alloc]initWithTarget:self selector:@selector(doParsing) object:nil];
    [myThread start];
    [super viewDidLoad];
}
-(void)doParsing
{
    xmlParser =[[XMLParser alloc]init];
    [xmlParser loadXML];
}

score 0 · Answer 2 · edited May 23 '17 at 11:58

0

Instead of creating a NSThread object you can start a thread using

//performSelectorInBackground:withObject: is NSObject's method
[self performSelectorInBackground:@selector(loadXML) withObject:nil];

I didn't find any buggy code but enable NSZombie and seee which object is causing this.

edited May 23 '17 at 11:58

Community

1
1

answered Mar 18 '13 at 05:27

Inder Kumar Rathore

39,458
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It needs to be `[xmlParser performSelectorInBackground:@selector(loadXML) withObject:nil];` – rmaddy Mar 18 '13 at 05:35

score 0 · Answer 3 · answered Mar 18 '13 at 05:33

loadXML is not define on ViewController so your thread code should be changed to use an instance of XMLParser instead of self like so:

XMLParser *parser = [[XMLParser alloc] init];
NSThread *thread = [[NSThread alloc] initWithTarget:parser selector:@selector(loadXML) object:nil];
[thread start];

score 0 · Answer 4 · answered Sep 25 '15 at 08:26

0

Since Apple introduced GCD, you may solve it without creating any NSThread instance.

dispatch_async(dispatch_get_global_object(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
  [self loadXML];
});

answered Sep 25 '15 at 08:26

Daniyar

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NSThread Showing SIGABRT

4 Answers4