NSXMLParser parses data just fine, but doesnt save it.

[BENJAMIN]

My NSXMLParser subclass parses all the data just fine (I have it calling NSLog every time it finds some text), but it doesnt save it, even though I tell it to add the data to my dictionary. When it reaches the

- (void)parserDidEndDocument:(NSXMLParser *)parser

, I've put a breakpoint and the debugger tells me the data dictionary(tvChannels in the code below) is completely empty. I get no errors or warnings in the code at all.

Here's my code:

 //
//  TVXMLParser.h
//  TVGuide
//
//  Created by Anja on 15/08/09.
//  Copyright 2009 __MyCompanyName__. All rights reserved.
//

#import <Foundation/Foundation.h>

#import "TVXML.h"

#define TVTagChannel	@"channel"
	#define TVTagChannelDisplayName		@"display-name"
	#define TVTagChannelIcon			@"icon"

#define TVTagProgramme	@"programme"
	#define TVTagProgrammeTitle			@"title"
	#define TVTagProgrammeSubTitle		@"sub-title"
	#define TVTagProgrammeDescription	@"desc"
	#define TVTagProgrammeCategory		@"category"
	#define TVTagProgrammeAspect		@"aspect"
	#define TVTagProgrammeActor			@"actor"

@class TVChannel;
@class TVProgramme;

@interface TVXMLParser : NSObject {
	NSMutableData *tvguideData; //The xml file
	NSMutableDictionary *tvChannels; //Array of all the tv-channels
	TVChannel *currentChannel;
	TVProgramme *currentProgramme;
	NSString *currentData;
	BOOL shouldStopParsing;
	NSXMLParser *parser;
}
@property (retain, nonatomic) NSMutableData *tvguideData;
@property (retain, nonatomic) NSMutableDictionary *tvChannels;
@property (retain, nonatomic) TVChannel *currentChannel;
@property (retain, nonatomic) TVProgramme *currentProgramme;
@property (retain, nonatomic) NSString *currentData;
@property (retain, nonatomic) NSXMLParser *parser;
@property BOOL shouldStopParsing;

- (void) beginParsing;

@end

#import "TVXMLParser.h"
#import "TVChannel.h"
#import "TVProgramme.h"


@implementation TVXMLParser
@synthesize tvguideData;
@synthesize tvChannels;
@synthesize currentChannel;
@synthesize currentProgramme;
@synthesize currentData;
@synthesize shouldStopParsing;
@synthesize parser;

- (void) dealloc
{
	[tvguideData release];
	[tvChannels release];
	[currentChannel release];
	[currentProgramme release];
	[currentData release];
	[parser release];
	
	[super dealloc];
}

- (void) beginParsing
{
	parser = [[NSXMLParser alloc] initWithData:tvguideData];
	[parser setDelegate:self];
	[parser parse];
}

- (id) init
{
	if (self = [super init])
	{
		NSString *path = [TVXML pathToTVXML];
		NSMutableData *theData = [[NSMutableData alloc] initWithContentsOfFile:path];
		self.tvguideData = theData;
		[theData release];
	}
	return self;
}


#pragma mark NSXMLParser delegate methods

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict 
{
	//Handles channels
	if ([elementName isEqualToString:TVTagChannel])
	{
		currentChannel = [[TVChannel alloc] init];
		currentChannel.channelID = [attributeDict objectForKey:@"id"];
	}
	
	else if ([elementName isEqualToString:TVTagChannelDisplayName])
	{
		
	}
	
	else if ([elementName isEqualToString:TVTagChannelIcon])
	{ 
		currentChannel.iconURL = [NSURL URLWithString: [attributeDict objectForKey:@"src"] ];
	}
	//Handles programmes
	else if ([elementName isEqualToString:TVTagProgramme])
	{
		currentProgramme = [[TVProgramme alloc] init];
		//[currentProgramme.dateAndTimeStart setTimeFromUnformatedTime: [attributeDict objectForKey:@"start"] ];
		//[currentProgramme.dateAndTimeEnd setTimeFromUnformatedTime: [attributeDict objectForKey:@"stop"] ];
		[currentProgramme setDateAndTimeStartFromUnformatedTime: [attributeDict objectForKey:@"start"] ];
		[currentProgramme setDateAndTimeEndFromUnformatedTime: [attributeDict objectForKey:@"stop"] ];
		
		NSDate *tommorrow = [[NSDate alloc] initWithTimeIntervalSinceNow:86400.0];
		if (tommorrow == [currentProgramme.dateAndTimeStart earlierDate:tommorrow])
			shouldStopParsing = YES;
			
		NSLog(@"%@", currentProgramme.channelID);
		currentProgramme.channelID = [attributeDict objectForKey:@"channel"];
	}
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 
{     
	//Handles channels
	if ([elementName isEqualToString:TVTagChannelDisplayName])
	{
		if (currentChannel) {
			currentChannel.channelName = currentData;
			currentData = nil;
		}
		else 
			NSLog(@"Error: reached didEndElement with TVTagChannelDisplayName and currentChannel is not allocated");
	}
	else if ([elementName isEqualToString:TVTagChannel])
	{
		[tvChannels setObject:currentChannel forKey:currentChannel.channelID];
		currentChannel = nil;
		
		if ( shouldStopParsing == YES )
			[parser abortParsing];
	}
	//Handles programmes
	else if ([elementName isEqualToString:TVTagProgramme])
	{
		TVChannel *chan = [tvChannels objectForKey:currentProgramme.channelID];
		[chan.tvProgrammes addObject:currentProgramme];
		currentProgramme = nil;
	}
	else if ( [elementName isEqualToString:TVTagProgrammeTitle] )
	{
		currentProgramme.programmeTitle = currentData;
		currentData = nil;
	}
	else if ( [elementName isEqualToString:TVTagProgrammeSubTitle] )
	{
		currentProgramme.programmeSubtitle = currentData;
		currentData = nil;
	}
	else if ( [elementName isEqualToString:TVTagProgrammeDescription] )
	{
		currentProgramme.programmeDescription = currentData;
		currentData = nil;
	}
	else if ( [elementName isEqualToString:TVTagProgrammeCategory] )
	{
		[currentProgramme.programmeCategories addObject:currentData];
		currentData = nil;
	}
	else if ( [elementName isEqualToString:TVTagProgrammeAspect] )
	{
		currentProgramme.programmeAspectRatio = currentData;
		currentData = nil;
	}
	else if ( [elementName isEqualToString:TVTagProgrammeActor] )
	{
		[currentProgramme.programmeCredits addObject:currentData];
		currentData = nil;
	}
}

- (void)parser:(NSXMLParser *)parser foundIgnorableWhitespace:(NSString *)whitespaceString
{
	[currentData stringByAppendingString:whitespaceString];
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 
{
	NSLog(@"%@", string);
	[currentData stringByAppendingString:string];
}

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError 
{
	NSLog(@"An error occured while trying to parse the XML.");
	NSLog(@"%@", [parseError localizedDescription]);
}

- (void)parserDidEndDocument:(NSXMLParser *)parser
{
	NSString *path = [TVXML pathToParsedXMLObject];
	NSLog(@"%@", path);
	if ( [NSKeyedArchiver archiveRootObject:tvChannels toFile:path] == NO)
		NSLog(@"Archiving failed");
}


@end

Here are the header files of the TVProgramme and TVChannel classes:

#import <Foundation/Foundation.h>

#define kChannelIDKey @"ChannelID"
#define kProgrammeTitleKey @"ProgrammeTitle"
#define kProgrammeSubtitleKey @"ProgrammeSubtitle"
#define kProgrammeDescriptionKey @"ProgrammeDescription"
#define kProgrammeAspectRatioKey @"ProgrammeAspectRatio"
#define kProgrammeCategoriesKey @"ProgrammeCategories"
#define kProgrammeCreditsKey @"ProgrammeCredits"
#define kDateAndtimeStartKey @"DateAndTimeStart"
#define kDateAndtimeEndKey @"DateAndTimeEnd"

@interface TVProgramme : NSObject <NSCoding> {
	NSString *channelID;
	
	NSString *programmeTitle;
	NSString *programmeSubtitle;
	NSString *programmeDescription;
	NSString *programmeAspectRatio;
	
	NSMutableArray *programmeCategories;
	NSMutableArray *programmeCredits;
	
	NSDate *dateAndTimeStart;
	NSDate *dateAndTimeEnd;
	
/*	TVDateAndTime *dateAndTimeStart;
	TVDateAndTime *dateAndTimeEnd;
	TVDateAndTime *dateOfCreation; */
}

@property (retain, nonatomic) NSString *channelID;

@property (retain, nonatomic) NSString *programmeTitle;
@property (retain, nonatomic) NSString *programmeSubtitle;
@property (retain, nonatomic) NSString *programmeDescription;
@property (retain, nonatomic) NSString *programmeAspectRatio;

@property (retain, nonatomic) NSMutableArray *programmeCategories;
@property (retain, nonatomic) NSMutableArray *programmeCredits;

@property (retain, nonatomic) NSDate *dateAndTimeStart;
@property (retain, nonatomic) NSDate *dateAndTimeEnd;


/*@property (retain, nonatomic) TVDateAndTime *dateAndTimeStart;
@property (retain, nonatomic) TVDateAndTime *dateAndTimeEnd;
@property (retain, nonatomic) TVDateAndTime *dateOfCreation;*/

- (void) setDateAndTimeStartFromUnformatedTime:(NSString *)unformatedTime;
- (void) setDateAndTimeEndFromUnformatedTime:(NSString *)unformatedTime;

@end

#import <Foundation/Foundation.h>



#define kIconURLKey			@"IconURL"
#define kChannelIDKey		@"ChannelID"
#define kChannelNameKey		@"ChannelName"
#define kTVProgrammesKey	@"TVProgrammes"

@class TVProgramme;

@interface TVChannel : NSObject <NSCoding> {
	NSURL			*iconURL; //First time will be an http, after it'll reference a file path
	NSString		*channelID; //The channel ID (example: d3+.dr.dk)
	NSString		*channelName; //The channel's name (example: 3plus)
	NSMutableArray	*tvProgrammes; //Array which contains TVProgramme objects
}

@property (retain, nonatomic) NSURL			 *iconURL;
@property (retain, nonatomic) NSString		 *channelID;
@property (retain, nonatomic) NSString		 *channelName;
@property (retain, nonatomic) NSMutableArray *tvProgrammes;

- (TVProgramme *) getCurrentProgramme;

@end

[kelvinkao]

Did you initialize the dictionary?

[BENJAMIN]

Originally Posted by kelvinkao

Did you initialize the dictionary?

I'm not sure, but if I hadnt, wouldnt I get a runtime error?

[BENJAMIN]

I have made my code allocate and initialize the dictionary and it now works. Thanks a lot Kelvinkao.