Problem with NSMutableArray and custom NSObject - objective-c

Question

I'm really desperate on this one. I'm trying to make a Framework which you can search and play YouTube videos with. But while testing it, I'm running in to a big problem.
In the search operation I'm adding YTVideos (a subclass of NSObject) to a NSMutableArray. When I loop thru it in the main(), I'm getting nil-objects:
Method
- (NSArray *)videosInRange:(NSRange)range {
if(range.length > 50) {
[NSException raise:#"Range lenth > 50"
format:#"The range of -videosInRange: can't be bigger than 50"];
return nil;
}
if((range.location + range.length) > 999) {
[NSException raise:#"Range to big"
format:#"The given range was to big (%d, %d)", range.location, range.length];
return nil;
}
NSString *searchURLString = [[self feedURL] absoluteString];
searchURLString = [searchURLString stringBySettingURLAttribute:#"start-index" value:[NSString stringWithFormat:#"%d",range.location + 1]];
searchURLString = [searchURLString stringBySettingURLAttribute:#"max-results" value:[NSString stringWithFormat:#"%d",range.length]];
NSLog(#"%#",searchURLString);
NSURL *url = [NSURL URLWithString:searchURLString];
NSXMLDocument *xmlDoc = [[NSXMLDocument alloc] initWithContentsOfURL:url
options:0
error:NULL];
if(!xmlDoc)
return nil;
NSArray *videoElements = [[xmlDoc rootElement] elementsForName:#"entry"];
NSMutableArray *videos = [[NSMutableArray alloc] initWithCapacity:[videoElements count]];
register int i;
for(i = 0; i < [videoElements count]; i++) {
NSAutoreleasePool *addPool = [[NSAutoreleasePool alloc] init];
YTVideo *vid = [[YTVideo alloc] initWithXMLElement:[videoElements objectAtIndex:i]];
[videos addObject:vid];
[vid release];
[addPool drain];
}
NSArray *retValue = [NSArray arrayWithArray:videos];
[videos release];
return retValue;
}
main()
int main(int argc, const char *argv[]) {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
YTSearchFeed *feed = [[YTSearchFeed alloc] initWithSearch:#"Eminem"];
long long results = [feed videoCount];
NSLog(#"%lld videos for search", results);
long long i = 0;
while(results != 0) {
int length = (results >= 50) ? (50) : (results);
NSArray *videos = [feed videosInRange:NSMakeRange(i, length)];
NSLog(#"L: %d", [videos count]);
int z;
for(z = 0; z < [videos count]; z++, i++) {
YTVideo *vid = [videos objectAtIndex:z];
NSString *title = [vid title];
NSLog(#"%d: %#", i+1, title);
}
results -= length;
}
[pool drain];
return NSApplicationMain(argc, argv);
}
I hope someone can take the time to look at this, and if you need anymore information, just ask.
Thank you in advance,
ief2
EDIT: YTVideo
- (id)initWithXMLElement:(NSXMLElement *)element {
self = [super init];
if(self != nil) {
_XMLElement = [element copy];
}
return self;
}
- (NSString *)title {
if(!_title) {
NSString *str = [[[self XMLElement] firstElementWithName:#"title"] stringValue];
_title = [[str stringByDecodingHTMLEntities] retain];
}
return [[_title copy] autorelease];
}
I get the title (and other video information) only when it's requested. the -stringByDecodingHTMLEntities works fine (Category on NSString).

Answer 1

I've rewritten the code and initialized all instance variables in the -initmethod