【发布时间】：2011-09-02 07:32:16
【问题描述】：
我有一个基于 xml 的应用程序。我已经编写了所有代码来进行 xml 解析，但主要问题是我的解析器没有进入 didStartElement 方法。它跳过didStartElement 和foundCharacters 方法，直接进入didEndElement 并在我的数组中返回计数0。可能是什么问题？我已经与xml的正确元素进行了比较。
这是我的api方法；通过这种方法我得到了xml文件。
#import <Foundation/Foundation.h>
@interface api : NSObject {
NSError *error;
NSURLResponse *response;
NSData *dataReply;
}
@property (nonatomic, retain)NSData *dataReply;
-(NSData *)getBusXMLAtStop:(NSString*)stopnumber;
@end
#import "api.h"
@implementation api
@synthesize dataReply;
//@synthesize stringReply;
-(NSData *)getBusXMLAtStop:(NSString*)stopnumber
{
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:
[NSURL URLWithString: [NSString stringWithFormat:@"http://www.google.com/ig/api?weather=,,,50500000,30500000",stopnumber]]];
[request setHTTPMethod: @"GET"];
dataReply = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSLog(@"%@",dataReply);
return dataReply;
}
-(void)dealloc
{
[super dealloc];
[dataReply release];
}
@end
这是我的解析器类，我在其中解析 xml 的每一个元素：
#import "TWeatherElement.h"//this is the class where the elements are Created
#import <Foundation/Foundation.h>
@interface TWeatherParser : NSObject<NSXMLParserDelegate>
{
NSMutableArray *mParserArray;//this is the array i have in the parser class to hold the elements
NSXMLParser *mXmlParser;
NSMutableString *mCurrentElement;
BOOL elementFound;
TWeatherElement *mWeatherobj;
}
@property (nonatomic, retain) NSMutableString *currentElement;
@property (nonatomic, retain)NSMutableArray *mParserArray;
@property (nonatomic, retain) TWeatherElement *weatherobj;
-(void)getInitialiseWithData:(NSData *)inData;
@end
#import "TWeatherParser.h"
#import "JourneyAppDelegate.h"
#import "api.h"
@implementation TWeatherParser
@synthesize weatherobj = mWeatherobj;
@synthesize currentElement = mCurrentElement;
@synthesize mParserArray;
-(void)getInitialiseWithData:(NSData *)inData
{
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:inData];
[parser setDelegate:self];
[parser setShouldProcessNamespaces:NO];
[parser setShouldReportNamespacePrefixes:NO];
[parser setShouldResolveExternalEntities:NO];
[parser parse];
[parser release];
}
-(void)parser:(NSXMLParser *)parser didStartElement:(NSString*) elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString*)qualifiedName attribute:(NSDictionary*)attributeDict
{
if (nil!= qualifiedName)
{
elementName = qualifiedName;
}
if ([elementName isEqualToString:@"weather"])
{
[mParserArray addObject:elementName];
self.weatherobj = [[TWeatherElement alloc]init];
}
else if([elementName isEqualToString:@"current_date_time"]||
[elementName isEqualToString:@"condition"]||
[elementName isEqualToString:@"humidity"]||
[elementName isEqualToString:@"icon d"]||
[elementName isEqualToString:@"wind_condition"]||
[elementName isEqualToString:@"low"]||
[elementName isEqualToString:@"high"])
{
self.currentElement = [NSMutableString string];
}
else
{
self.currentElement = nil;
}
}
-(void)parser:(NSXMLParser*)parser foundCharacters:(NSString*)string
{
if (nil!= self.currentElement)
{
[self.currentElement appendString:string];
}
}
-(void)parser:(NSXMLParser *)parser didEndElement:(NSString*)elementName namespaceURI:(NSString*)namespaceURI qualifiedName:(NSString*)qName
{
if (nil != qName)
{
elementName = qName;
}
if ([elementName isEqualToString:@"current_date_time"])
{
self.weatherobj.currentdate = self.currentElement;
}
else if ([elementName isEqualToString:@"condition"])
{
self.weatherobj.conditionname = self.currentElement;
}
else if ([elementName isEqualToString:@"humidity"])
{
self.weatherobj.humidity = self.currentElement;
}
else if ([elementName isEqualToString:@"icon"])
{
self.weatherobj.icon = self.currentElement;
}
else if ([elementName isEqualToString:@"wind_condition"])
{
self.weatherobj.wind = self.currentElement;
}
else if ([elementName isEqualToString:@"low"])
{
self.weatherobj.mintemp = self.currentElement;
}
else if ([elementName isEqualToString:@"high"])
{
self.weatherobj.maxtemp = self.currentElement;
}
else if ([elementName isEqualToString:@"weather"])
{
[mParserArray addObject:self.weatherobj];
NSLog(@"mDataArray count = %d",[mParserArray count]);
[self.weatherobj release];
}
}
-(void)dealloc
{
self.weatherobj = nil;
self.currentElement = nil;
[super dealloc];
}
@end
这是 tableviewcontroller 类，我想在其中显示从 tableviewcell 上的 xml 获取的值
#import <UIKit/UIKit.h>
#import "TWeatherParser.h"
@class TWeatherParser;
@interface TWeatherController : UITableViewController {
UITableView *mTableView;
NSMutableArray *mImage;
NSMutableArray *weatherarray;//this is the array that has been created in this class.
TWeatherParser *weather;
}
@property (nonatomic, retain) IBOutlet UITableView *mTableView;
@end
//
// TWeatherController.m
// Journey
//
// Created by raji.nair on 5/3/11.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import "TWeatherController.h"
#import "TWeatherCell.h"
#import "TWeatherElement.h"
#import "TWeatherParser.h"
#import "api.h"
@implementation TWeatherController
@synthesize mTableView;
#pragma mark -
#pragma mark Initialization
- (id)initWithStyle:(UITableViewStyle)style {
// Override initWithStyle: if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
style = UITableViewStyleGrouped;
if (self = [super initWithStyle:style]) {
}
return self;
}
#pragma mark -
#pragma mark View lifecycle
/*
- (void)viewDidLoad {
[super viewDidLoad];
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
*/
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
api *ap = [[api alloc]init];
NSData *aData = [ap getBusXMLAtStop:@"1"];
NSString *str = [[NSString alloc] initWithData:aData encoding:NSUTF8StringEncoding];
//NSInteger value = [str intValue];
if (str!= NULL)
{
NSLog(@"this is success %@",ap.dataReply);
TWeatherParser *parser = [[TWeatherParser alloc]init];
[parser getInitialiseWithData:ap.dataReply];
[parser release];
}
else
{
UIAlertView *alertview = [[UIAlertView alloc]initWithTitle:@"Alert" message:@"cannot fetch" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alertview show];
[alertview release];
}
[ap release];
}
#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
**return [weather.mParserArray count];**.//Here i am having a doubt that which array should i count over here
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
TWeatherCell *cell =(TWeatherCell *) [mTableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[TWeatherCell alloc] initWithStyle:UITableViewStyleGrouped reuseIdentifier:CellIdentifier] autorelease];
}
TWeatherElement *newobj = [weather.mParserArray objectAtIndex:indexPath.row];
if ([newobj.icon isEqualToString:@"http://\n"])
{
cell.weatherimage.image = [UIImage imageNamed:@"listIcon-H.png"];
}
else {
NSData *imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:newobj.icon]];
cell.weatherimage.image = [UIImage imageWithData:imageData];
[imageData release];
}
cell.reportdate.text = newobj.currentdate;
cell.conditionname.text = newobj.conditionname;
cell.twotemp.text = [NSString stringWithFormat:@"Temp:%@/%@",newobj.mintemp,newobj.maxtemp];
cell.twodirection.text = newobj.wind;
cell.humidity.text = newobj.humidity;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
// Configure the cell...
return cell;
}
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:indexPath animated:YES];
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *) indexPath
{
return 100.0;
}
#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
@end
XML 文件；
<?xml version="1.0"?><xml_api_reply version="1"><weather module_id="0" tab_id="0" mobile_row="0" mobile_zipped="1" row="0" section="0" ><forecast_information><city data=""/><postal_code data=""/><latitude_e6 data="50500000"/><longitude_e6 data="30500000"/><forecast_date data="2011-05-26"/><current_date_time data="2011-05-26 04:00:00 +0000"/><unit_system data="US"/></forecast_information><current_conditions><condition data="Clear"/><temp_f data="52"/><temp_c data="11"/><humidity data="Humidity: 62%"/><icon data="/ig/images/weather/sunny.gif"/><wind_condition data="Wind: NW at 9 mph"/></current_conditions><forecast_conditions><day_of_week data="Thu"/><low data="48"/><high data="68"/><icon data="/ig/images/weather/mostly_sunny.gif"/><condition data="Mostly Sunny"/></forecast_conditions><forecast_conditions><day_of_week data="Fri"/><low data="52"/><high data="75"/><icon data="/ig/images/weather/mostly_sunny.gif"/><condition data="Mostly Sunny"/></forecast_conditions><forecast_conditions><day_of_week data="Sat"/><low data="55"/><high data="81"/><icon data="/ig/images/weather/mostly_sunny.gif"/><condition data="Mostly Sunny"/></forecast_conditions><forecast_conditions><day_of_week data="Sun"/><low data="55"/><high data="86"/><icon data="/ig/images/weather/mostly_sunny.gif"/><condition data="Partly Sunny"/></forecast_conditions></weather></xml_api_reply>
【问题讨论】：
-
请把xml链接发给你
-
你对我们有什么期望？甚至没有一段代码？
-
+1！从您尝试解析的 XML 中发布一个示例（摘录），以及您设置解析器及其委托的代码 - 包括您的“...didStartElement...”实现 - 直到（并包括）开始解析元素的代码。否则，我们所能做的就是“Kaffeesatzlesen”……哦，对照
NSXMLParser的header-file 检查“……didStartElement……”的签名：文档（很少，但是……）有时会有小问题委托方法的选择器中的拼写错误。 -
嗨@danyowdee，我已经在我的问题中发布了代码并发布了xml文件。我已经编写了上面的代码来解析 xml 文件，但它没有进入 didstartelement 以及如何解析属性值。谢谢
-
嗨@Aman，我已经在我的问题中添加了xml文件。请检查一下。谢谢
标签： iphone objective-c xml nsxmlparser