我想用这个命令读取HTML文件：
parseHTML = [[NSXMLParser alloc] initWithContentsOfURL:[NSURL URLWithString:[@"http://theurl.com"]];
[parseHTML setDelegate:self];
[parseHTML parse];
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict
{
if(somethingfound)
{
[parseHTML abortParsing];
parseHTML2 = [[NSXMLParser alloc] initWithContentsOfURL:[NSURL URLWithString:[@"http://theurl.com" stringByAppendingString:product_link]]];
[parseHTML2 setDelegate:self];
[parseHTML2 parse];
}
}
我收到了一个不正常的错误：
线程1：编程接收信号：“EXC 糟糕的访问“
任何想法？ 问候
您好Walter感谢您的评论，这里是完整的实施： 我希望它有所帮助......： - /
FirstViewController.h
#import <UIKit/UIKit.h>
@interface FirstViewController : UIViewController <ZBarReaderDelegate, NSXMLParserDelegate>{
UIImageView *resultImage;
UITextView *resultText;
NSString *product_link;
NSXMLParser *parseHTML;
NSXMLParser *parseHTML2;
}
@property (nonatomic, retain) IBOutlet UIImageView *resultImage;
@property (nonatomic, retain) IBOutlet UITextView *resultText;
@property (nonatomic, assign) IBOutlet NSString *product_link;
@property (nonatomic, assign) NSXMLParser *parseHTML;
@property (nonatomic, assign) NSXMLParser *parseHTML2;
@property (nonatomic, retain) NSMutableArray *myMutableArray;
- (IBAction) scanButtonTapped;
@end
FirtViewController.m
#import "FirstViewController.h"
#import "/System/Library/Frameworks/Foundation.framework/Headers/NSDebug.h"
@implementation FirstViewController
@synthesize resultImage, resultText;
@synthesize product_link;
@synthesize parseHTML, parseHTML2;
bool link_is_here = false;
bool allergy_is_here = false;
bool parse_one_ok = true;
int hoch = 0;
- (IBAction) scanButtonTapped
{
NSZombieEnabled = true;
// ADD: present a barcode reader that scans from the camera feed
ZBarReaderViewController *reader = [ZBarReaderViewController new];
reader.readerDelegate = self;
ZBarImageScanner *scanner = reader.scanner;
// TODO: (optional) additional reader configuration here
// EXAMPLE: disable rarely used I2/5 to improve performance
[scanner setSymbology: ZBAR_I25
config: ZBAR_CFG_ENABLE
to: 0];
// present and release the controller
[self presentModalViewController: reader animated: YES];
[reader release];
}
- (void) imagePickerController: (UIImagePickerController*) reader
didFinishPickingMediaWithInfo: (NSDictionary*) info
{
// ADD: get the decode results
id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
for(symbol in results)
break;
// EXAMPLE: do something useful with the barcode data
resultText.text = symbol.data;
parseHTML = [[[NSXMLParser alloc] initWithContentsOfURL:[NSURL URLWithString:[@"http://URL.de/suche/?q=" stringByAppendingString:symbol.data]] ]autorelease];
[parseHTML setDelegate:self];
[parseHTML parse];
// [parseHTML release];
// EXAMPLE: do something useful with the barcode image
resultImage.image =
[info objectForKey: UIImagePickerControllerOriginalImage];
// ADD: dismiss the controller (NB dismiss from the *reader*!)
[reader dismissModalViewControllerAnimated: YES];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict
{
for(NSString *key in [attributeDict allKeys]) {
if ([[attributeDict valueForKey:key] isEqualToString:@"some_string"]) {
link_is_here = true;
}
if ([key isEqualToString:@"href"] && link_is_here) {
product_link = [attributeDict valueForKey:key];
// [parseHTML abortParsing];
parseHTML2 = [[NSXMLParser alloc] initWithContentsOfURL:[NSURL URLWithString:[@"http://URL.de" stringByAppendingString:product_link]]];
[parseHTML2 setDelegate:self];
[parseHTML2 parse];
parse_one_ok = true;
link_is_here = false;
}
if ([key isEqualToString:@"id"] && [[attributeDict valueForKey:key] isEqualToString:@"other_string"]) {
allergy_is_here = true;
}
if ([key isEqualToString:@"title"] && allergy_is_here) {
NSLog(@"DO: %@",[attributeDict valueForKey:key]);
}
if ([key isEqualToString:@"id"] && [[attributeDict valueForKey:key] isEqualToString:@"string"]) {
allergy_is_here = false;
parse_one_ok = true;
NSLog(@"Parser off");
//close all parser
}
}
}
-(void) parserDidEndDocument:(NSXMLParser *)parser{
[parseHTML setDelegate:nil];
[parseHTML2 setDelegate:nil];
[parseHTML release];
if (parse_one_ok) {
[parseHTML2 release];
}
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[parseHTML release];
[parseHTML2 release];
self.product_link = nil;
self.resultImage = nil;
self.resultText = nil;
[super dealloc];
}
@end
嘿，我的声明在标题中：
@interface FirstViewController : UIViewController <NSXMLParserDelegate>{
NSString *product_link;
NSXMLParser *parseHTML;
NSXMLParser *parseHTML2;
}
@property (nonatomic, retain) IBOutlet NSString *product_link;
@property (nonatomic, retain) NSXMLParser *parseHTML;
@property (nonatomic, retain) NSXMLParser *parseHTML2;
并在来源：
@synthesize parseHTML, parseHTML2;
@synthesize product_link;
我在控制台中收到这些异常：
- [NSCFString setDelegate：]：发送到实例的无法识别的选择器 0x1acad0
答案 0 :(得分：1)
当我必须一次解析两个文件时，我为第二个文件设置了第二个委托。委托是一个简单的NSObject，它遵循NSXML Parser Delegate协议。 （它有parserDidStart，parserDidEnd，等等等等。
然后在我的第一个解析器的didEndElement中，我用这样的东西启动了第二个解析器
SoundCloudParser *scParser = [[[SoundCloudParser alloc] init]autorelease];
NSOperationQueue *queue = [[[NSOperationQueue alloc] init]autorelease];
NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:scParser selector:@selector(parseXMLUrl:) object:currentArticle.uriString];
[queue addOperation:operation];
[operation release];
我是在一个单独的线程上完成的，这就是为什么你有队列的原因。我的'parseXMLUrl：looks just like a regular one, it just sets the delegate to my second delegate object instead of setting it to自我。
您需要考虑的另一件事是您正在didStartElement工作，我发现很多时候我的解析变量中没有任何值，直到{{1} }}。这将是你需要检查的其他内容。
更新：将来，如果您尝试构建类似ZBarSDK或其他项目的东西，请说明。它会让我节省大约半个小时的代码
基本上我们需要做的是建立一个新的委托。我们称之为didEndElement。将其设置为常规NSObject并使其遵循newDelegate协议。它需要一个mutableArray或一个字典来存储它将要解析的数据，它需要一个函数来启动它。这就是它。
所以，我们假设您已在项目中创建<NSXMLDelegate>和newDelegate.h，并在newDelegate.h中创建了newDelegate.m和NSMutableString *currentElement;
NSMutableArray *currentArticle;
}
- (void)parseXMLUrl:(NSString *)URL;
@end
#import“Your_App_Delegate.h”
@interface newDelegate：NSObject {
didStartElement所以，现在在你的newDelegate *ndParser = [[[newDelegateParser alloc] init]autorelease];
NSOperationQueue *queue = [[[NSOperationQueue alloc] init]autorelease];
NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:ndParser selector:@selector(parseXMLUrl:) object:[NSString stringWithFormat:@"http://URL.de/%@",product_link]];
[queue addOperation:operation];
[operation release];
中你会像这样调用newDelegate：
{{1}}
这将启动第二个解析器并将其传递给解析的url。您将需要一种方法来获取该数据，因此要么将一些结果存储在App Delegate中，要么更改第二个解析器的parseXMLURL方法以返回一些值。