XML Parse not showing elements with & symbol inside

问题

Im trying to parse a xml feed in my app... The xml file is in this url

feeds.feedburner.com/blogspot/TUvAW?format=xml

The problem is that when I access the description segment it diplays different special symbols such as quotation marks. This is one of the descripton segments im trying to parse from my xml:

<description>Este es mi blog 3&lt;img src="http://feeds.feedburner.com/~r/blogspot/TUvAW/~4/URCV9ModTR0" height="1" width="1"/&gt;</description>

Im parsing it with the NSXMLParser, these are the method I'm using in my:

XMLParser.m

- (void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    currentNodeContent = (NSMutableString *) [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

- (void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementname namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    if ([elementname isEqualToString:@"item"])
    {
        currentFeed = [Feed alloc];
        isStatus = YES;
    }
    if ([elementname isEqualToString:@"author"])
    {
        isStatus = NO;
    }
}

- (void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementname namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if (isStatus)
    {
        if ([elementname isEqualToString:@"description"])
        {
            currentFeed.description = currentNodeContent;
            NSLog(@"%@",currentNodeContent);

        }
        if ([elementname isEqualToString:@"title"])
        {
            currentFeed.content = currentNodeContent;
            NSLog(@"%@",currentNodeContent);

        }
        if ([elementname isEqualToString:@"link"])
        {
            currentFeed.WVUrl = currentNodeContent;
            NSLog(@"%@",currentNodeContent);
        }
    }
    if ([elementname isEqualToString:@"item"])
    {
        [self.feeds addObject:currentFeed];
        currentFeed = nil;
        currentNodeContent = nil;
    }
}

Im using those NSLogs to track the strings that Im getting from the parse but my description node content is always showing just this : > The title and link nodes are displaying perfectly.

I want to get all that string from the description node to use it later but simply I can't, I dont know whats going wrong with this.

回答1:

The problems have been outlined by Abhishek, Rob and me. But I think it's worth to summarize it and show the correct solution.

The main problem is that parser:foundCharacters: is called several times for the <description> tag, each call providing a piece of the description.

The solution is to concatenate the pieces:

XMLParser.h:

NSMutableString* currentNodeContent;

XMLParser.m:

- (void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    if (currentNodeContent == nil)
        currentNodeContent = [[NSMutableString alloc] initWithCapacity: 20];
    [currentNodeContent appendString: [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];
}

- (void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementname namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    if ([elementname isEqualToString:@"item"])
    {
        currentFeed = [Feed alloc];
        isStatus = YES;
    }
    if ([elementname isEqualToString:@"author"])
    {
        isStatus = NO;
    }
}

- (void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementname namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if (isStatus)
    {
        if ([elementname isEqualToString:@"description"])
        {
            currentTweet.description = currentNodeContent;
            NSLog(@"%@",currentNodeContent);

        }
        if ([elementname isEqualToString:@"title"])
        {
            currentTweet.content = currentNodeContent;
            NSLog(@"%@",currentNodeContent);

        }
        if ([elementname isEqualToString:@"link"])
        {
            currentFeed.WVUrl = currentNodeContent;
            NSLog(@"%@",currentNodeContent);
        }
    }
    if ([elementname isEqualToString:@"item"])
    {
        [self.feeds addObject:currentFeed];
        currentFeed = nil;
        [currentNodeContent release];
        currentNodeContent = nil;
    }
}

回答2:

The problem in the Xml file is use of "&" Character.

Do one this just get the xml data in one string and then replace "&" with any unique string and then parse your xml.

While showing or use of xml data just check if the string you are getting contains the same unique string in it then replace that string with the "&".

来源：https://stackoverflow.com/questions/14113499/xml-parse-not-showing-elements-with-symbol-inside

标签

iphone

ios

xml

xml-parsing

nsxmlparser