CODEWITHSUNDEEP
iosparsinghttp
Buneme Kyakilika
Buneme Kyakilika

Reputation: 1202

Objective-C append to string not working NSXMLParser

I am trying to parse some XML data and append the parsed data into an NSString object. I have successfully parsed the XML data using NSXMLParser, but when I log the value of the string called arrayString, I just get the value of the first <name>, instead of all of them. What am I doing wrong?

Here is my code:

(void)parseWithData:(NSData *)data {
parser = [[NSXMLParser alloc] initWithData:data];
[parser setDelegate:self];
//You might want to consider additional params like:
[parser setShouldProcessNamespaces:NO];
[parser setShouldReportNamespacePrefixes:NO];
[parser setShouldResolveExternalEntities:NO];
//And then finally (which activates the delegates):
[parser parse];
NSLog(@"The content of the array is%@",childElement);

}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI             qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
 currentElement = nil;
 currentElement = [elementName copy];
 if ([elementName isEqualToString:@"row"]) {
    //This means the parser has entered the XML parent element named: xmlParentElement
    //All of the child elements that need to be stored in the array should have their own IVARs and declarations.
    childElement = [[NSMutableString alloc] init];
 }
 }

 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
   //For all child elements, run this if statement.
    if ([currentElement isEqualToString:@"name"]) {
    [childElement appendString:string];
    NSLog(string);
    [arrayString stringByAppendingString:string];
   // NSLog(arrayString);


   }

And I parse the data by calling these methods:

  NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:data];
  [self parseWithData:data];

Upvotes: 2

Views: 375

Answers (2)

Marcus Adams
Marcus Adams

Reputation: 53860

The stringByAppendingString function returns a NSString. It doesn't alter the receiver.

You need to fix your use of stringByAppendingString. For example, in foundCharacters, replace this:

[arrayString stringByAppendingString:string];

With this:

arrayString = [arrayString stringByAppendingString:string];

Apple's documentation on stringByAppendingString:

stringByAppendingString:

Returns a new string made by appending a given string to the receiver.

Also, when appending strings, don't forget to initialize the string before you append to it.

Upvotes: 1

Zeke
Zeke

Reputation: 134

I think the stringByAppendingString method creates a new NSString. Try this instead of that:

arrayString = [arrayString stringByAppendingString:string];

Upvotes: 1

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