Methods for converting XML files into NSData objects

NSData *xmlData = [[NSData alloc]initWithContentsOfFile:[NSString stringWithFormat:@"%@/",[[NSBundle mainBundle] resourcePath]]]; 
  //2. Convert xmlData into xml document  GDataXMLDocument *xmlDocument = [[GDataXMLDocument alloc]initWithData:xmlData options:0 error:nil]; 
  //3.Get node  GDataXMLElement *rootElement = ; 
  //4. Get child nodes/*NSArray *elementArray = ;
   //Get the classone node
   GDataXMLElement *classoneElement = [elementArray firstObject];
   for(GDataXMLElement *element in)
   {
     //Get the text value of the current node
     NSLog(@"%@",);
     if (>0) {
       GDataXMLElement *infoElement = [ lastObject];
       //Get all attributes and attribute values ​​of the node
       NSArray *attArray = ;
       for (GDataXMLElement *attElement in attArray) {
         //Get the attribute name and attribute value
         NSLog(@"%@-%@",,);
       }
     }
   }
   */ 
  //Fuzzy search  NSArray *eArray = [rootElement nodesForXPath:@"//info" error:nil]; 
  NSLog(@"%@",eArray); 

 xmlThe string is：
<users>
<user name="hoge" age="20" />
<user name="fuga" age="30" />
</users>
 
//Parse button event-(IBAction)btnXml
{
  
  NSString* str= [uitextview1 text];
  //Convert string to data  NSData *xmlData = [str dataUsingEncoding: NSUTF8StringEncoding];
  //The parsing of xml requires the use of the NSXMLParser class, first declare an NSXMLParser object  //Start the analysis  NSXMLParser* xmlRead = [[NSXMLParser alloc] initWithData:xmlData];//Initialize the NSXMLParser object  [xmlRead setDelegate:self];//Set the parsing method proxy for NSXMLParser object  [xmlRead parse];//Calling the agent to parse the NSXMLParser object to see if the parsing is successful}
 
// parser, read content from between two nodes- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
  //NSLog(@"%@",string);
}
 
//Get the value at the end of the node- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
 namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
  //NSLog(@"%@",elementName);
}
//Get the value of the node head- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
 namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
  attributes:(NSDictionary *)attributeDict 
{
  //NSLog(@"%@",elementName);
  if([elementName isEqualToString: @"user"])
  {
    NSString* strName=[attributeDict valueForKey:@"name"];
    NSString* strAge=[attributeDict valueForKey:@"age"]; 
    NSString* strUser=;
    strUser=[strUser stringByAppendingFormat:@"Name: %@, Age: %@\n",strName,strAge];
    [uitextview2 setText:strUser];
    //NSLog(@"Name: %@,Age: %@", strName, strAge);  }
}