NSXMLParser not showing error log - ios

Question

How can i catch error of NSXMLParser in console ?
My project are using offical "LazyTableImages".
problem is its not working all the time and the table not getting any value .
here is what ive done to get some debug info :
placing "cachePolicy:0 and timeoutInterval:160.0" to avoid url timeout :
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:TopPaidAppsFeed] cachePolicy:0 timeoutInterval:160.0]
then adding "NSLog(#"data: %#", string)" to check if i have xml currect:
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:self.dataToParse];
NSString *string = [[NSString alloc] initWithData:self.dataToParse encoding:NSUTF8StringEncoding];
NSLog(#"data: %#", string);
[parser setDelegate:self];
[parser parse];
the console shows the xml with these at start and any thing else was ok on it :
2014-02-24 11:54:30.566 MyXMlParserTest[1419:1403] data: <?xml version="1.0" encoding="UTF-8"?>
after that i put this on parseError to check for error but nothing happend:
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
{
NSString * errorString = [NSString stringWithFormat:#"Unable to download data (Error code %i )",[parseError code]];
UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:#"Error loading content" message:errorString
delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[errorAlert show];
}
then i put "NSLog(#"nodeCount)" on connectionDidFinishLoading :
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
self.appListFeedConnection = nil; // release our connection
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
// create the queue to run our ParseOperation
self.queue = [[NSOperationQueue alloc] init];
// create an ParseOperation (NSOperation subclass) to parse the RSS feed data
// so that the UI is not blocked
ParseOperation *parser = [[ParseOperation alloc] initWithData:self.appListData];
parser.errorHandler = ^(NSError *parseError) {
dispatch_async(dispatch_get_main_queue(), ^{
[self handleError:parseError];
});
};
// Referencing parser from within its completionBlock would create a retain
// cycle.
__weak ParseOperation *weakParser = parser;
parser.completionBlock = ^(void) {
if (weakParser.appRecordList) {
// The completion block may execute on any thread. Because operations
// involving the UI are about to be performed, make sure they execute
// on the main thread.
dispatch_async(dispatch_get_main_queue(), ^{
// The root rootViewController is the only child of the navigation
// controller, which is the window's rootViewController.
RootViewController *rootViewController = (RootViewController*)[(UINavigationController*)self.window.rootViewController topViewController];
rootViewController.entries = weakParser.appRecordList;
NSUInteger nodeCount = [rootViewController.entries count];
NSLog(#"nodeCount: %lu", (unsigned long)nodeCount);
// tell our table view to reload its data, now that parsing has completed
[rootViewController.tableView reloadData];
});
}
// we are finished with the queue and our ParseOperation
self.queue = nil;
};
[self.queue addOperation:parser]; // this will start the "ParseOperation"
// ownership of appListData has been transferred to the parse operation
// and should no longer be referenced in this thread
self.appListData = nil;
}
and it returns :
014-02-24 11:54:30.582 MyXMlParserTest[1419:a0b] nodeCount: 0
from this point i dont where to check.
i tried this both on real and simulator device and same result happend.
1 of 10 time it works and table filled. 9 other time nothing happend.
the string tag of xml is same all time. only image url tag are changing.

Answer 1

Ok after chaging this line :
__weak ParseOperation *weakParser = parser;
to either of these :
ParseOperation *weakParser = parser;
or
__block ParseOperation *weakParser = parser;
problem goes away.