XML專題:使用NSXMLParser解析xml檔案

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使用NSXMLParser解析xml檔案 

    1. 設定委派物件，開始解析 
    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];   //或者也可以使用initWithContentsOfURL直接下載檔案，但是有一個原因不這麼做： 
    // It‘s also possible to have NSXMLParser download the data, by passing it a URL, but this is not desirable 
    // because it gives less control over the network, particularly in responding to connection errors. 
    [parser setDelegate:self]; 
    [parser parse]; 

    2. 常用的委託方法 
    - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName 
                                namespaceURI:(NSString *)namespaceURI 
                                qualifiedName:(NSString *)qName 
                                attributes:(NSDictionary *)attributeDict; 
    - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName 
                                namespaceURI:(NSString *)namespaceURI 
                                qualifiedName:(NSString *)qName; 
    - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string; 
    - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError; 

    static NSString *feedURLString = @"http://www.yifeiyang.net/test/test.xml"; 

    3.  應用舉例 
    - (void)parseXMLFileAtURL:(NSURL *)URL parseError:(NSError **)error 
    { 
        NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL]; 
        [parser setDelegate:self]; 
        [parser setShouldProcessNamespaces:NO]; 
        [parser setShouldReportNamespacePrefixes:NO]; 
        [parser setShouldResolveExternalEntities:NO]; 
        [parser parse]; 
        NSError *parseError = [parser parserError]; 
        if (parseError && error) { 
            *error = parseError; 
        } 
        [parser release]; 
    } 

    - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 
                                        qualifiedName:(NSString*)qName attributes:(NSDictionary *)attributeDict{ 
        // 元素開始控制代碼 
        if (qName) { 
            elementName = qName; 
        } 
        if ([elementName isEqualToString:@"user"]) { 
            // 輸出屬性值 
            NSLog(@"Name is %@ , Age is %@", [attributeDict objectForKey:@"name"], [attributeDict objectForKey:@"age"]); 
        } 
    } 

    - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 
                                        qualifiedName:(NSString *)qName 
    { 
        // 元素終了控制代碼 
        if (qName) { 
               elementName = qName; 
        } 
    } 

    - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 
    { 
        // 取得元素的text 
    } 
    NSError *parseError = nil; 
    [self parseXMLFileAtURL:[NSURL URLWithString:feedURLString] parseError:&parseError];

 

http://blog.csdn.net/z251257144/article/details/7175634

XML專題:使用NSXMLParser解析xml檔案