如何通过xml解析器解析此xml文件中的属性 [英] how to parse the attributes like in this xml file through xml parser

问题描述

XML文件代码：

 < Books> 
< Book id =1isbn =123456> 
< name>让我们C< / name> 
< authors> 
< author> Yashwant Kanetkar< / author> 
< author> ABC< / author> 
< / authors> 
< price> 250.00< / price> 
< / Book> 
< Book id =2isbn =345678> 
< name>使用C ++进行编程< / name> 
< authors> 
< author> Balaguruswamy< / author> 
< author> XYZ< / author> 
< / authors> 
< price> 400.00< / price> 
< / Book> 
< Book id =3isbn =789012> 
< name>专业的iPhone和iPad应用程序开发< / name> 
< authors> 
< author> Gene Backlin< / author> 
< author> QWE< / author> 
< / authors> 
< price> 550.00< / price> 
< / Book> 
< Book id =4isbn =901234> 
< name>开始iOS 4应用程序开发< / name> 
< authors> 
< author> Wei-Meng Lee< / author> 
< author> IOP< / author> 
< / authors> 
< price> 500.00< / price> 
< / Book> 
< / Books> 
  

任何人都可以帮我这个吗？

<我正在使用这段代码：

   - （void）parser：（NSXMLParser *）解析器didStartElement：（NSString *） elementName namespaceURI：（NSString *）namespaceURI qualifiedName：（NSString *）qualifiedName attributes：（NSDictionary *）attributeDict {
 if（[elementName isEqualToString：@Books]）
 {
 appDelegate。 books = [[NSMutableArray alloc] init]; 
} 
 else if（[elementName isEqualToString：@Book]）
 {
 aBook = [[book alloc] init]; 
 aBook.bookID = [[attributeDict objectForKey：@id] integerValue]; 
 aBook.isbn = [[attributeDict objectForKey：@isbn] integerValue]; 
 NSLog（@阅读isbn价值：％@，aBook.isbn）; 
 NSLog（@读取id值：％i，aBook.bookID）; 
} 
 NSLog（@处理元素：％@，elementName）; 
} 
  

解决方案

首先取一个bool变量。然后编写以下代码。也许它会帮助你我几天前完成了相关的工作。

第一个.h文件

  @interface EventsViewController：UIViewController< NSXMLParserDelegate> 
 {
 NSMutableArray * _idArray; 
 NSMutableArray * _isbnArray; 
 BOOL isBook; 
} 
  

然后在.m文件中你应该写这个。

//在ViewDidLoad中

   - （void）viewDidLoad 
 {
 [super viewDidLoad]; 
 _idArray = [[NSMutableArray alloc] init]; 
 _isbnArray = [[NSMutableArray alloc] init]; 
 
 NSString * xmlString = [[NSBundle mainBundle] pathForResource：@today_in_history_shortofType：@xml]; 
 NSURL * fileURL = [NSURL fileURLWithPath：xmlString]; 
 NSXMLParser * parser = [[NSXMLParser alloc] initWithContentsOfURL：fileURL]; 
 [parser setDelegate：self]; 
 [解析器解析]; 
} 
  

//现在使用xml解析器委托方法

pragma mark - NSXMLParser委托方法

   - （void）解析器：（NSXMLParser *）解析器didStartElement： （NSString *）elementName namespaceURI：（NSString *）namespaceURI qualifiedName：（NSString *）qName attributes：（NSDictionary *）attributeDict {
 
 if（[elementName isEqualToString：@Books]）{
 isBook = YES; 
} 
 else if（[elementName isEqualToString：@Book]&& isBook）{
 NSString * idString = [attributeDict objectForKey：@id]; 
 NSString * isbnString = [attributeDict objectForKey：@isbn]; 
 [_idArray addObject：idString]; 
 [_isbnArray addObject：isbnString]; 
 NSLog（@Book id是：％@和Book isbn是：％@，idString，isbnString）; 
} 
} 
 
  - （void）解析器：（NSXMLParser *）解析器foundCharacters：（NSString *）string {
} 
 
 - （void）解析器：（NSXMLParser *）解析器didEndElement：（NSString *）elementName namespaceURI：（NSString *）namespaceURI qualifiedName：（NSString *）qName {
 
 if（[elementName isEqualToString：@Books ]）{
 isBook = NO; 
 NSLog（@Id数组计数：％d，[_ idArray计数]）; 
} 
} 
  

注意：我已经检查过，它正在工作，你可以在你的代码中使用它，如果它仍然不起作用，那么你的项目中会出现其他错误，你可以通过制作单独的项目来验证它。

XML FILE CODE:

  <Books>
  <Book id="1" isbn="123456">
  <name>Let Us C</name>
  <authors>
  <author>Yashwant Kanetkar</author>
  <author>ABC</author>
  </authors>
  <price>250.00</price>
  </Book>
  <Book id="2" isbn="345678">
  <name>Programing With C++</name>
  <authors>
  <author>Balaguruswamy</author>
  <author>XYZ</author>
  </authors>
  <price>400.00</price>
  </Book>
  <Book id="3" isbn="789012">
  <name>Professional iPhone and iPad Application Development</name>
  <authors>
  <author>Gene Backlin</author>
  <author>QWE</author>
  </authors>
  <price>550.00</price>
  </Book>
  <Book id="4" isbn="901234">
  <name>Beginning iOS 4 Application Development</name>
  <authors>
  <author>Wei-Meng Lee</author>
  <author>IOP</author>
  </authors>
  <price>500.00</price>
  </Book>
  </Books>

Can anyone pls help me with this?

I'm using this code:

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict {
    if([elementName isEqualToString:@"Books"]) 
    {
        appDelegate.books = [[NSMutableArray alloc] init];
    }
    else if([elementName isEqualToString:@"Book"]) 
    {
        aBook = [[Book alloc] init];
        aBook.bookID = [[attributeDict objectForKey:@"id"] integerValue];
        aBook.isbn = [[attributeDict objectForKey:@"isbn"] integerValue];
        NSLog(@"Reading isbn value : %@", aBook.isbn);
        NSLog(@"Reading id value :%i", aBook.bookID);
    }
    NSLog(@"Processing Element: %@", elementName);
}

解决方案

First take a bool variable. and then write the following code. perhaps it will help you I have done the related work , a few days ago.

First .h file

@interface EventsViewController : UIViewController <NSXMLParserDelegate>
{
    NSMutableArray *_idArray;
    NSMutableArray *_isbnArray;
    BOOL isBook;
}

Then in .m file you should write this.

//In ViewDidLoad

- (void)viewDidLoad
{
    [super viewDidLoad];
    _idArray = [[NSMutableArray alloc] init];
    _isbnArray = [[NSMutableArray alloc] init];

    NSString *xmlString = [[NSBundle mainBundle] pathForResource:@"today_in_history_short" ofType:@"xml"];
    NSURL * fileURL = [NSURL fileURLWithPath:xmlString];
    NSXMLParser * parser = [[NSXMLParser alloc] initWithContentsOfURL:fileURL];
    [parser setDelegate:self];
    [parser parse];
}

// Now In xml Parser Delegate Methods

pragma mark - NSXMLParser Delegate Method

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

    if ([elementName isEqualToString:@"Books"]) {
        isBook = YES;
    }
    else if ([elementName isEqualToString:@"Book"] && isBook){
        NSString *idString = [attributeDict objectForKey:@"id"];
        NSString *isbnString = [attributeDict objectForKey:@"isbn"];
        [_idArray addObject:idString];
        [_isbnArray addObject:isbnString];
        NSLog(@"Book id is: %@ and Book isbn is: %@",idString,isbnString);
    }
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{

    if ([elementName isEqualToString:@"Books"]) {
        isBook=NO;
        NSLog(@"Id Array count is :%d",[_idArray count]);
    }
}

Note: I have check it , It's working , you can use it in you code , if still it's won't working then there will be something else wrong in your project, you can verify it by making separate project.

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