EXC_BAD_ACCESS when doing operation on NSMutableArray

Question

I currently trying to connect to a Webserver, and consuming a table from it. I have put the table into a NSMutable array (it's global), named it DataSet (I got this part working). However When I try to preform any type of operation on it (Example: count), it will give me a EXC_BAD_ACCESS. BTW I'm using xcode 4.2 with ARC, so it's not a memory management issue. Any suggestions?

- (void)viewDidLoad
{

    NSURL *url = [NSURL URLWithString: @"`url.com`"];
    NSData *jsonData =[NSData dataWithContentsOfURL:url];

    if(jsonData)

    {
        xmlParser = [[NSXMLParser alloc] initWithData: jsonData];
        [xmlParser setDelegate: self];
        [xmlParser parse];
    }
    NSLog(@"This is Number of elements: %@",[DataSet count]); ///<----EXC_BAD_ACCESS

 ..... //// default stuff//.....
    }



-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{


    if ([elementName isEqualToString:@"string"])
    {

        /// puts the data into Array luckyNumbers
        NSError *error;
        SBJsonParser *json = [[SBJsonParser new] init];
        DataSet = [[NSMutableArray alloc] init];
        DataSet = [json objectWithString:soapResults error:&error];

      ///  NSLog(@"%@",DataSet); /// this works

    }
}

I'm not sure if I'm suppose to but, I read that I should use Diagnostics, so I turned on NSZombie objects, Malloc guard, and Malloc Stack. They said I should type this into the gdb console info malloc-history (memorylocation)

However I don't know where to get the memory location of the problem. I would appreciate any help.

I couldn't get this to work, so I tried using and NSDictionary instead of NSArray and surprisingly it work! Here is my updated code for anyone who was wondering what I did.

(void)viewDidLoad

{

NSURL *url = [NSURL URLWithString: @"url.com"];
NSData *jsonData =[NSData dataWithContentsOfURL:url];
DataSet = [[NSDictionary alloc] init];

if(jsonData) {

    xmlParser = [[NSXMLParser alloc] initWithData: jsonData];
    [xmlParser setDelegate: self];
    [xmlParser setShouldResolveExternalEntities:YES];
    [xmlParser parse];
}
NSLog(@"%@",DataSet.allKeys);

///// default stuff /// } }

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName

{

if ([elementName isEqualToString:@"string"])
{


    //NSLog(@"%@",DataSet);
    DataSet = [soapResults JSONValue];
    NSLog(@"%@",DataSet);

}

}

Nekto Nekto · Accepted Answer · 2012-01-12T15:45:24

1) In viewDidLoad add:

DataSet = [[NSMutableArray alloc] init];

2) In -(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName

if ([elementName isEqualToString:@"string"])
{
    NSError *error;
    SBJsonParser *json = [[SBJsonParser new] init];
    [DataSet addObject:[json objectWithString:soapResults error:&error]];
    [json release];
}

3) After that in DataSet all parsed objects will be stored

EXC_BAD_ACCESS when doing operation on NSMutableArray

However I don't know where to get the memory location of the problem. I would appreciate any help.

1 Answers