解析iOS中同名但不同字段的属性 [英] Parsing attributes with same name but in different fields in iOS
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问题描述
我有一个 php 如下:
I have a php as follows:
<?php
header("Content-Type: application/rss+xml; charset=ISO-8859-1");
$ip=$_GET['ip'];
$type=$_GET['type'];
$rssfeed = '<?xml version="1.0" encoding="ISO-8859-1"?>';
$rssfeed .= '<rss version="2.0">';
$connection = mysql_connect('localhost','root')
or die('Could not connect to database');
mysql_select_db('Android')
or die ('Could not select database');
$query = "SELECT * FROM User_Upload_Table WHERE Status='Approved' and Content_Type='$type' ORDER BY Approved_Time desc";
$result = mysql_query($query) or die ("Could not execute query");
while($row = mysql_fetch_array($result)) {
extract($row);
$rssfeed .= "<channel>";
$rssfeed .= "<title>" .$row[Content_Name] ."</title>";
$rssfeed .= '<link>http://'.$ip .$row[Content_Path] .$row[Status] . '/' .$row[Content_Name] . '</link>';
if($type == "Video"){
$rssfeed .= '<description>' .$row[Duration]. '</description>';
}
$rssfeed .= '<category>' .$row[Description]. '</category>';
$rssfeed .= '<rating>' .$row[Rating]. '</rating>';
$rssfeed .= '<generator>' .$row[Vote_Count]. '</generator>';
$rssfeed .= '<language></language>';
if($type == "Video"){
$name = $row[Content_Name];
$subName = substr($name, 0, strpos($name, '.'));
$rssfeed .= '<image>http://'.$ip.'/Android/'.$type.'/'.$subName.'.jpg</image>';
} else {
$rssfeed .= '<image>http://'.$ip.'/Android/'.$type.'/Approved.jpg</image>';
}
$rssfeed .= '<copyright>Copyright 2011</copyright>';
$rssfeed .= '<item>';
$rssfeed .= '<title>Pre-Roll</title>';
$rssfeed .= '<link>http://'.$ip.'/Android/Video/Approved/MERCEDES_BENZ.3gp</link>';
$rssfeed .= '<description>Post-Roll</description>';
$rssfeed .= '<source>http://'.$ip.'/Android/Video/Approved/PG_Dawn_PGDN4582000_30.mp4</source>';
$rssfeed .= '</item>';
$rssfeed .= '</channel>';
}
$rssfeed .= '</rss>';
echo $rssfeed;
?>
这里我有两个字段，名称为 title，一个在频道中，另一个在项目属性中.我该如何单独解析它.我的解析代码如下:
Here i have two fields with the name title, one in channel and the other in item attribute. How can I parse it separately. My parsing code is as follows:
-(void)parseXMLFileAtURL:(NSString *)URL{
NSURL *xmlURL = [NSURL URLWithString:URL];
rssParser = [[NSXMLParser alloc]initWithContentsOfURL:xmlURL];
[rssParser setDelegate:self];
[rssParser setShouldProcessNamespaces:NO];
[rssParser setShouldReportNamespacePrefixes:NO];
[rssParser setShouldResolveExternalEntities:NO];
[rssParser parse];
NSLog(@"Parsed");
}
-(void)parserDidStartDocument:(NSXMLParser *)parser{
NSLog(@"Found file and started parsing");
}
-(void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError{
NSString *errorString = [NSString stringWithFormat:@"Unable to download feed from website (Error Code %i)", [parseError code]];
NSLog(@"Error parsing xml: %@", errorString);
UIAlertView *errorAlert = [[UIAlertView alloc]initWithTitle:@"Error loading content" message:errorString delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[errorAlert show];
}
-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
insideItem = FALSE;
insideChannel = FALSE;
rssElement = [[NSMutableDictionary alloc]init];
currentElement = [elementName copy];
if ([elementName isEqualToString:@"channel"]) {
title = [[NSMutableString alloc]init];
link = [[NSMutableString alloc]init];
description = [[NSMutableString alloc]init];
copyright = [[NSMutableString alloc]init];
image = [[NSMutableString alloc]init];
}
}
-(void)parser: (NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
if ([elementName isEqualToString:@"channel"]) {
[rssElement setObject:title forKey:@"title"];
[rssElement setObject:link forKey:@"link"];
[rssElement setObject:description forKey:@"description"];
[rssElement setObject:copyright forKey:@"copyright"];
[rssElement setObject:image forKey:@"image"];
[item addObject:[rssElement copy]];
NSLog(@"adding stories %@", title);
}
}
-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
if ([currentElement isEqualToString:@"title"]) {
[title appendString:string];
}else if ([currentElement isEqualToString:@"link"]) {
[link appendString:string];
}else if ([currentElement isEqualToString:@"description"]) {
[description appendString:string];
}else if ([currentElement isEqualToString:@"copyright"]) {
[copyright appendString:string];
}else if ([currentElement isEqualToString:@"image"]) {
[image appendString:string];
}
}
-(void)parserDidEndDocument:(NSXMLParser *)parser{
NSLog(@"all done");
NSLog(@"item array has %d items", [item count]);
[tableView reloadData];
NSLog(@"Finished Parsing");
}
现在，问题是当我在表格视图中显示提要时，两个标题字段被附加，但我只需要显示频道属性的标题字段.
Now, the problem is when I am displaying the feed in a table view, the two title fields are getting appended but I need to display only the title field of channel attribute.
请帮助我，让我知道我做错了什么.
Please help me and let me know what is that I am doing wrong.
正确的代码在这方面会有很大帮助.
The proper code will be of immense help in this regard.
推荐答案
在 didStartElement 中，将当前标签推入堆栈.在 didEndElement 中，从堆栈中弹出它.然后你可以随时检查父元素的堆栈，并区分频道的标题元素和项目的标题元素.
In didStartElement, push the current tag to a stack. In didEndElement, pop it from the stack. Then you can always check the stack for the parent element and distinguish between the channel's title element and the item's title element.
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