Question

I have a problem that I can’t figure out even after a couple of hours of testing different ways to achieve what I need: Here is the code I have a problem with:

AppDelegate.h

#import <Three20/Three20.h>

#import "NewsRssParser.h"
#import "NewsRss.h"

@class NewsRssParser;
@class NewsRss;

@interface AppDelegate : NSObject <UIApplicationDelegate,NewsRssParserDelegate> {
 NewsRssParser * _rssParser; 
 NSMutableArray * _newsRssArray;
}

@property(readwrite, retain) NewsRssParser * rssParser;
@property(readwrite, retain) NSMutableArray * newsRssArray;

@end

AppDelegate.m

@implementation AppDelegate

@synthesize rssParser = _rssParser;
@synthesize newsRssArray = _newsRssArray;

[...]

- (void)myFunction{

 NSMutableArray *dsItems = [[[NSMutableArray alloc] init] autorelease];

 for(NSMutableArray *rssItem in self.rssParser.rssItems)
 {
  NSString * rssItemTitle = [(NewsRss *)rssItem title];
  NSString * rssItemAuthor = [@"par " stringByAppendingString:[(NewsRss *)rssItem author]];
  NSString * rssItemDescription = [(NewsRss *)rssItem description];
  NSString * rssItemLinkUrl = [(NewsRss *)rssItem linkUrl];
  NSString * rssItemImageUrl = [(NewsRss *)rssItem mediaUrl];

  TTTableMessageItem *tMsgItem = [TTTableMessageItem itemWithTitle:rssItemTitle caption:rssItemAuthor text:rssItemDescription timestamp:nil imageURL:rssItemImageUrl URL:rssItemLinkUrl];
  [self.newsRssArray addObject:tMsgItem];
  [dsItems addObject:tMsgItem];
 }

 NSLog(@"AppDelegate/count/rssItems=%d", [self.rssParser.rssItems count]);
 NSLog(@"AppDelegate/count/newsRssArray=%d", [self.newsRssArray count]);
 NSLog(@"AppDelegate/count/dsItems=%d", [dsItems count]);

}

When I run the code, my RSS parser works properly and I can loop on 10 items in self.rssParser.rssItems. I need to access these items in another view to show them in a table, hence I prepare the data in NSMutableArray * newsRssArray that I have declared in my .h file

However if I try to add those 10 objects in the NSMutableArray * newsRssArray, I have nothing in the end (see the code output in the debugger). I test my code successfully if I use NSMutableArray *dsItems declared inside my function.

Here is gdb output:

Attaching to process 47209.
2011-01-29 14:55:24.813 TestApp[47209:207] AppDelegate/count/rssItems=10
2011-01-29 14:55:24.814 TestApp[47209:207] AppDelegate/count/newsRssArray=0
2011-01-29 14:55:24.815 TestApp[47209:207] AppDelegate/count/dsItems=10
(gdb) 

What am I doing wrong?

Thanks for your help!

Answer 1

Just glancing over the code you have supplied, I don’t see where you initialize newsRssArray. Is this in another place or did you forget to init?