Question

iam developing one application.In that iam using the xml parsing.That xml file contain the 4 category tags and other tags.From the xml file i want to get the data of category tag.At the time of getting the category data,every time i print the array of category values.That show correctly.But after completion of parsing, another tag data will be append to last category name.My parsing code is like below.

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
if(self.presentvalue)
{
    [presentvalue appendString:string];
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{

if(![elementName compare:@"category"])
{
    [categories addObject:presentvalue];
    NSLog(@"%@",presentvalue);
    NSLog(@"Number of elements %@",categories);
}

}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if([elementName isEqualToString:@"category"])
{
    presentvalue=[NSMutableString string];  
}
}

And my xml file content is like

    <lesson>
   <categories>
   <category id="1">1</category>
   <category id="2">2</category>
   <category id="3">3</category>
   </categories>
   <references>
    <reference id="1" type="youtube" categoryid="2" name="Boyles law">
    <url><![CDATA[http://www.youtube.com/watch?v=J_I8Y-i4Axc]]>
     </url>
    </reference>
    </references>
    </lesson>

From this xml i got the array values like 1,2,3http://www.youtube.com/watch?v=J_I8Y-i4Axc.Like this i got the result.So please tell me how to get the category values without that extra data.

Answer 1

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if ([elementName isEqualToString:@"category"]) {
    NSLog(@"Node is found correctly");
    if(presentvalue == nil)
        presentvalue = [NSMutableString string];
    else 
        [presentvalue setString:@""];
}
else {
    presentvalue = nil;
}

}


- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{

[presentvalue appendString:string];
if (presentvalue) 
{
   [self.tempArray addObject:presentvalue]; // add this line. create a tempArray containing all the strings.
    presentvalue = nil;
}
}

this should help u in your parsing. hope it helps. happy coding 🙂