How to parse multilevel xml in xcode - ios

Question

can you help me with this program i'm trying to parse an xml file with two levels (i don't know the term so i call that way) here's the sample of my xml file
<?xml version="1.0" encoding="UTF-8"?>
<countries>
<country>
<countryname>Philippines</countryname>
<subsidiaries>
<subsidiary>
<name>Sart Philippines Inc.</name>
<address>Unit 10-A The World Empire Building, 330 Senator Gil Puyat Avenue Philippines, Philippines</address>
<phone>+63.2.929</phone>
<fax>+63.932</fax>
<email>enquiry.philippines#sarts.com</email>
<website>http://www.sartorius-mechatronics.com.ph</website>
</subsidiary>
</subsidiaries>
</country>
<country>
<countryname>Denmark</countryname>
<subsidiaries>
<subsidiary>
<name>Stedim Nordic A|S</name>
<address>Hoerskaetten 6d 2630 Taastrup, Denmark</address>
<phone>+45.7023.4400</phone>
<fax>+45.4630.4030</fax>
<email>ne.customersupport#sartorius.com</email>
<website></website>
</subsidiary>
<subsidiary>
<name>Nordic A|S</name>
<address>Hoerskaetten 6D 2630 Taastrup, Denmark</address>
<phone>+45.7523.8700</phone>
<fax>+45.4130.4020</fax>
<email>ne.customersupport#sartorius.com</email>
<website></website>
</subsidiary>
</subsidiaries>
</country>
</countries>
What i was planning to do was you choose a country, then you choose a subsidiary to view it's info. I was able to parse it but i was not able to show the Stedim Nordic A|S subsidiary.
here is my parser class
#implementation Parser
-(id)initParser
{
if (self == [super init])
{
app = (AppDelegate *) [[UIApplication sharedApplication]delegate];
}
return self;
}
-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI: (NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if ([elementName isEqualToString:#"countries"])
{
app.listArray = [[NSMutableArray alloc]init];
}
if ([elementName isEqualToString:#"country"])
{
theList = [[List alloc]init];
}
}
-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
if (!currentElementValue)
{
currentElementValue = [[NSMutableString alloc]initWithString:string];
}
else
{
[currentElementValue appendString:string];
}
}
-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI: (NSString *)namespaceURI qualifiedName:(NSString *)qName
{
if ([elementName isEqualToString:#"country"])
{
[app.listArray addObject:theList];
}
else {
if ([elementName isEqualToString:#"countryname"]) {
theList.countryname = currentElementValue;
}
if ([elementName isEqualToString:#"name"])
{
theList.name = currentElementValue;
}
if ([elementName isEqualToString:#"address"])
{
theList.address = currentElementValue;
}
if ([elementName isEqualToString:#"phone"])
{
theList.phone = currentElementValue;
}
if ([elementName isEqualToString:#"fax"])
{
theList.fax = currentElementValue;
}
if ([elementName isEqualToString:#"email"])
{
theList.email = currentElementValue;
}
if ([elementName isEqualToString:#"website"])
{
theList.website = currentElementValue;
}
currentElementValue = nil;
}
}
#end
I can't explain it well but i hope you can help me , if you can send me a link for a tutorial for this kind of issues i would really appreciate it

Answer 1

The issue is because on your second country element there is two subsidiary.
So you need to modify your code like:
You need another NSString for holding the Country Name. Because there is a single Country name element for your two subsidiary.
NSString *temp = nil;
-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI: (NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if ([elementName isEqualToString:#"countries"])
{
app.listArray = [[NSMutableArray alloc]init];
}
if ([elementName isEqualToString:#"subsidiary"])
{
theList = [[List alloc]init];
}
}
-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI: (NSString *)namespaceURI qualifiedName:(NSString *)qName
{
if ([elementName isEqualToString:#"subsidiary"])
{
theList.countryname = temp;
[app.listArray addObject:theList];
}
else
{
if ([elementName isEqualToString:#"countryname"])
{
temp = currentElementValue;
}
if ([elementName isEqualToString:#"name"])
{
theList.name = currentElementValue;
}
if ([elementName isEqualToString:#"address"])
{
theList.address = currentElementValue;
}
if ([elementName isEqualToString:#"phone"])
{
theList.phone = currentElementValue;
}
if ([elementName isEqualToString:#"fax"])
{
theList.fax = currentElementValue;
}
if ([elementName isEqualToString:#"email"])
{
theList.email = currentElementValue;
}
if ([elementName isEqualToString:#"website"])
{
theList.website = currentElementValue;
}
currentElementValue = nil;
}
}

Answer 2

Well you can call the parser recursively. If you know what you are looking for search if it is available and take its value if present. i would suggest you to look into gdata xml parser