NSXMLParser example

iphone, nsxmlparser, objective-c

Solution

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
    currentKey = nil;
    [currentStringValue release];
    currentStringValue = nil;
    if([elementName isEqualToString:@"Value"]){
        //alloc some object to parse value into
    } else if([elementName isEqualToString:@"Signature"]){
        currentKey = @"Signature";
        return;
    }
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    if(currentKey){
        if(!currentStringValue){
            currentStringValue = [[NSMutableString alloc] initWithCapacity:200];
        }
        [currentStringValue appendString:string];
    }
}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
    if([elementName isEqualToString:@"Signature"] && [currentStringValue intValue] == 804){
        ivar.signature = [currentStringValue intValue];
        return;
    }
}

Something like this. Note I havent really tested this code on compiler so there will be syntax errors here & there.

Problem

I have an XML like this ``` <IS> <Value> <Signature>-804</Signature> <Amount>139</Amount> </Value> <Value> <Signature>-845</Signature> <Amount>639466</Amount> </Value> <Value> <Signature>-811</Signature> <Amount>16438344</Amount> </Value> <Value> <Signature>-1115</Signature> <Amount>-159733</Amount> </Value> </IS> ``` Now I want to parse only specific values from this. For example, how do I get the value for the node having corresponding signature as -804 Please help me.. I know the basics of NSXMLParser, but do not know how to acheive conditional parsing. Thank you.

Original source