如何在 iPhone 中使用 libxml2 解析 xml

Question

我从 .net Web 服务器获取 xml 形式的信息。

我正在使用 NSXml 解析器来解析它。

但需要时间去解析。

我听说 libxmll2 比 NSXml 解析器更快。

但我没有找到关于如何使用它的明确信息。

任何人都可以发布有关如何使用 libxml2 进行解析的示例代码或示例。

提前谢谢你。

Answer 1

你需要使用XML解析来实现这个。我建议使用touchXML。以下是示例代码：

-(void)callwebservice{
    NSString *path = @"YOUR URL";
    [self grabRSSFeed:path];
}

-(void) grabRSSFeed:(NSString *)blogAddress {
    // Initialize the blogEntries MutableArray that we declared in the header
    blogEntries = [[NSMutableArray alloc] init];    

    // Convert the supplied URL string into a usable URL object
    NSURL *url = [NSURL URLWithString: blogAddress];

    // Create a new rssParser object based on the TouchXML "CXMLDocument" class, this is the object that actually grabs and processes the RSS data
    CXMLDocument *rssParser = [[[CXMLDocument alloc] initWithContentsOfURL:url options:0 error:nil] autorelease];

    // Create a new Array object to be used with the looping of the results from the rssParser
    NSArray *resultNodes = NULL;

    // Set the resultNodes Array to contain an object for every instance of an  node in our RSS feed
    resultNodes = [rssParser nodesForXPath:@"//Node you want to parse" error:nil];

    // Loop through the resultNodes to access each items actual data
    for (CXMLElement *resultElement in resultNodes) {
        // Create a temporary MutableDictionary to store the items fields in, which will eventually end up in blogEntries
        NSMutableDictionary *blogItem = [[NSMutableDictionary alloc] init];

        // Create a counter variable as type "int"
        int counter;

        // Loop through the children of the current  node
        for(counter = 0; counter < [resultElement childCount]; counter++) {
            // Add each field to the blogItem Dictionary with the node name as key and node value as the value
            [blogItem setObject:[[resultElement childAtIndex:counter] stringValue] forKey:[[resultElement childAtIndex:counter] name]];
            NSLog(@"Data = %@",[[resultElement childAtIndex:counter] stringValue]); 
        }

        // Add the blogItem to the global blogEntries Array so that the view can access it.
        [blogEntries addObject:[blogItem copy]];

    }

    [YourTable reloadData];
}

在头文件中导入 touchXML 库。

Answer 2

我建议您查看 TouchXML。

它很快，因为它使用 libxml2，并且比直接使用 libxml2（用纯 c 编写）要简单得多。