Objective-C Parsing XML File
I followed a quick tutorial on parsing an XML file, thi开发者_开发知识库s what i have.
- (void)loadDataFromXML {
NSString* path = @"/Users/samichaudry/Music/iTunes/iTunes Music Library.xml";
NSData* data = [NSData dataWithContentsOfFile: path];
NSXMLParser* parser = [[NSXMLParser alloc] initWithData: data];
[parser setDelegate:self];
[parser parse];
[parser release];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict{
if ([elementName isEqualToString:@"dict"]) {
NSString* name = [attributeDict valueForKey:@"name"];
NSString* artist = [attributeDict valueForKey:@"artist"];
NSLog(@"Name: %@, Artisit: %@", name, artist);
}
}
But in the log all i get is this about 60 times;
2011-02-14 22:53:37.617 SearchLibrary[5218:a0f] Name: (null), Artisit: (null)
Can anyone help? Thanks, Sami.
The attribute dict is not what you're looking for.
If you have the XML tag:
<dict foo="bar" baz="42">
Then in the parser:didStartElement:...
callback:
elementName
will bedict
attributeDict
will be a dictionary with 2 key-value pairs: "foo" => "bar" and "baz" => "42"
Since you're parsing an xml file in plist format, the <dict>
does not have any attributes. Therefore, the attributesDict
is empty, and [attributesDict objectForKey:@"name"]
returns nil
.
The absolute simplest way to parse the iTunes xml file is:
NSDictionary *contents = [NSDictionary dictionaryWithContentsOfFile:path];
Keep in mind, however, that this can end up eating a metric ton of memory and totally kill the performance of your app.
But hey, the library will be loaded. :)
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