iphone - 无法解析 XML iPhone

Question

我正在使用下面的代码来解析下载的文件，之前在重新启动我的 mac 之前它工作正常但现在它说无法解析 XML，而需要下载的数据正在正确显示。

-(IBAction)loginButton:(id)sender{

    NSString *user = [userNameField text];

    NSString *passwd = [passwordField text];

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    [defaults setObject:user forKey:@"Username"];

    [defaults setObject:passwd forKey:@"Password"];

    [defaults synchronize];

    NSLog(@"Data Saved");

    NSString *urlAsString = @"http";

    NSURL *url = [NSURL URLWithString:urlAsString];

    NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url]; 

    [urlRequest setTimeoutInterval:30.0f];

    [urlRequest setHTTPMethod:@"POST"];

    NSOperationQueue *queue = [[NSOperationQueue alloc] init];

    [NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response,NSData *data, NSError *error) {

         if ([data length] >0 && error == nil){

             NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

             NSLog(@"HTML = %@", html);

         }
         else if ([data length] == 0 && error == nil){
             NSLog(@"Nothing was downloaded."); 

         }

         else if (error != nil){
             NSLog(@"Error happened = %@", error);
        } }];


    NSString *xmlFilePath = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"xml"];

    NSData *xml = [[NSData alloc] initWithContentsOfFile:xmlFilePath];

    self.xmlParser = [[NSXMLParser alloc] initWithData:xml];

    self.xmlParser.delegate = self;

    if ([self.xmlParser parse]) {

        NSLog(@"The XML is parsed");

    }else{

        NSLog(@"Failed to parse the XML");
    }
}

-(void)parserDidStartDocument:(NSXMLParser *)parser {

    self.rootElement = nil;
    self.currentElementPointer = nil; }

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

    if (self.rootElement == nil){
        self.rootElement = [[XMLElement alloc] init]; self.currentElementPointer = self.rootElement;
    } else {
        XMLElement *newElement = [[XMLElement alloc] init]; newElement.parent = self.currentElementPointer; [self.currentElementPointer.subElements addObject:newElement]; self.currentElementPointer = newElement;
    }
    self.currentElementPointer.name = elementName; self.currentElementPointer.attributes = attributeDict;

    NSString *user = [NSString stringWithFormat:@"%@", [attributeDict objectForKey:@"user"]];

    NSLog(@"User: %@", user);

    if ([user isEqualToString:@"1"]) {
        NSLog(@"Test succeeded!");
    }    
}

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

    if ([self.currentElementPointer.text length] > 0){
        self.currentElementPointer.text =
        [self.currentElementPointer.text stringByAppendingString:string];
    } else {
        self.currentElementPointer.text = string; }
}

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

    self.currentElementPointer = self.currentElementPointer.parent; 

}

-(void)parserDidEndDocument:(NSXMLParser *)parser{ 

    self.currentElementPointer = nil;
}

Answer 1

如果无法解析 XML，您应该查看 -(NSError *)parseError 以查看错误的确切位置。

NSLog(@"Parse Error: %@", [self.xmlParser parseError]);

这不是您问题的直接答案，但由于您实际上没有问过(？)，我不知道从哪里开始。