XML Parse 不显示带有 & 的元素里面的符号 [英] XML Parse not showing elements with & symbol inside

问题描述

我正在尝试解析我的应用程序中的 xml 提要...xml 文件在此 url 中

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

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

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

问题是，当我访问描述段时，它会显示不同的特殊符号，例如引号.这是我试图从我的 xml 中解析的描述段之一:

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>

我用 NSXMLParser 解析它，这些是我在我的中使用的方法:

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

XMLParser.m

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;
    }
}

我使用这些 NSLogs 来跟踪我从解析中获得的字符串，但我的描述节点内容总是显示如下:>标题和链接节点显示完美.

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.

我想从 description 节点中获取所有字符串以供以后使用，但我不能，我不知道这有什么问题.

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.

推荐答案

Abhishek、Rob 和我已经概述了这些问题.但我认为值得总结一下并展示正确的解决方案.

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

主要问题是 parser:foundCharacters: 被多次调用 标签，每次调用提供一段描述.

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

解决方案是连接这些部分:

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;
    }
}

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