使用 NSXMLParser 解析 XML 文件 - 获取值

发布于 2024-11-09 00:59:40 字数 633 浏览 0 评论 0原文

我有一个 XML 文件，其中包含一些我想使用的数据：

<?xml version="1.0" encoding="UTF-8" ?>

<items>
<item name="product" price="19.95" where="store">
This is the first product.
</item>

<item name="product2" price="39.95" where="online">
This is the second product.
</item>

<item name="product3" price="99.95" where="garagesale">
This is the third product.
</item>

</items>

如果我创建 4 个数组，一个用于名称，一个用于价格，一个用于购买地点，一个用于描述，我将如何获得数据存入数组？

我想使用 NSXMLParser，但无法获取 name、price、where 或描述。

我不知道如何做到这一点。

任何帮助表示赞赏。

原文

I've got a XML file which contains some data I would like to use:

<?xml version="1.0" encoding="UTF-8" ?>

<items>
<item name="product" price="19.95" where="store">
This is the first product.
</item>

<item name="product2" price="39.95" where="online">
This is the second product.
</item>

<item name="product3" price="99.95" where="garagesale">
This is the third product.
</item>

</items>

If I made 4 arrays, one for the name, one for the price, one for where it was bought and one for its description, how would I get the data into the arrays?

I figured using NSXMLParser, but couldn't get name, price, where or the description.

I'm stuck on how to do this.

Any help appreciated.

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揽清风入怀 2024-11-16 00:59:41

首先，您需要创建一个执行解析的对象。它将实例化 NSXMLParser 实例，设置本身作为解析器的委托，然后调用解析消息。它还可以负责存储四个结果数组：

NSXMLParser * parser = [[NSXMLParser alloc] initWithData:_data];
[parser setDelegate:self];
BOOL result = [parser parse];

您最有兴趣在委托对象中实现的消息是 didStartElement。这个人会因 XML 文件中的每个元素而被调用。在此回调中，您可以添加您的姓名、价格和价格。其中属性到各自的数组。

- (void)parser:(NSXMLParser *)parser
didStartElement:(NSString *)elementName
  namespaceURI:(NSString *)namespaceURI
 qualifiedName:(NSString *)qualifiedName
    attributes:(NSDictionary *)attributeDict
{
    // just do this for item elements
    if(![elementName isEqual:@"item"])
        return;

    // then you just need to grab each of your attributes
    NSString * name = [attributeDict objectForKey:@"name"];

    // ... get the other attributes

    // when we have our various attributes, you can add them to your arrays
    [m_NameArray addObject:name];

    // ... same for the other arrays
}

First you need to create an object that does the parsing. It will instatiate the NSXMLParser instance, set itself as the delegate for the parser and then call the parse message. It can also be responsible for storing your four result arrays:

NSXMLParser * parser = [[NSXMLParser alloc] initWithData:_data];
[parser setDelegate:self];
BOOL result = [parser parse];

The message you are most interested in implementing in your delegate objects is didStartElement. This guy gets called for each element in your XML file. In this callback you can add your name, price & where attributes to their respective arrays.

- (void)parser:(NSXMLParser *)parser
didStartElement:(NSString *)elementName
  namespaceURI:(NSString *)namespaceURI
 qualifiedName:(NSString *)qualifiedName
    attributes:(NSDictionary *)attributeDict
{
    // just do this for item elements
    if(![elementName isEqual:@"item"])
        return;

    // then you just need to grab each of your attributes
    NSString * name = [attributeDict objectForKey:@"name"];

    // ... get the other attributes

    // when we have our various attributes, you can add them to your arrays
    [m_NameArray addObject:name];

    // ... same for the other arrays
}

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执着的年纪 2024-11-16 00:59:41

要获取标签之间的值（例如“这是第一个产品。”），您可以覆盖 - (void)parser:(NSXMLParser *)parserfoundCharacters:(NSString *)string

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捂风挽笑 2024-11-16 00:59:41

在下面的方法中

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict {

    if([elementName isEqualToString:@"item"]) {

        NSString *name=[attributeDict objectForKey:@"name"];
        NSString *price=[attributeDict objectForKey:@"price"];
        NSString *where=[attributeDict objectForKey:@"where"];
    }
}

in the follwing method

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict {

    if([elementName isEqualToString:@"item"]) {

        NSString *name=[attributeDict objectForKey:@"name"];
        NSString *price=[attributeDict objectForKey:@"price"];
        NSString *where=[attributeDict objectForKey:@"where"];
    }
}

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