Iphone parsing xml & json-1

XML file parsing example.
Code 1 and Code 2 are the basic content of IOS development.
Code 1.
# Import <UIKit/UIKit. h>
 
@ Class XmlTestViewController;
 
@ Interface XmlTestAppDelegate: NSObject <UIApplicationDelegate> {
UIWindow * window;
XmlTestViewController * viewController;
}
@ Property (nonatomic, retain) IBOutlet UIWindow * window;
@ Property (nonatomic, retain) IBOutlet XmlTestViewController * viewController;
 
@ End
 
Code 2
1 # import "XmlTestAppDelegate. h"
2 # import "XmlTestViewController. h"
3 @ implementation XmlTestAppDelegate
4 @ synthesize window;
5 @ synthesize viewController;
6 # pragma mark-
7 # pragma mark Application lifecycle
8-(BOOL) application :( UIApplication *) application
9 didfinishlaunchingwitexceptions :( NSDictionary *) launchOptions {
10 [window addSubview: viewController. view];
11 [window makeKeyAndVisible];
12 return YES;
13}
14-(void) applicationWillResignActive :( UIApplication *) application {}
15-(void) applicationDidEnterBackground :( UIApplication *) application {}
16-(void) applicationWillEnterForeground :( UIApplication *) application {}
17-(void) applicationDidBecomeActive :( UIApplication *) application {}
18-(void) applicationWillTerminate :( UIApplication *) application {}
19-(void) applicationDidReceiveMemoryWarning :( UIApplication *) application {}
20-(void) dealloc {
21 [viewController release];
22 [window release];
23 [super dealloc];
24}
25 @ end

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Code 3 is the controller header file.
Code 3

# Import <UIKit/UIKit. h>
 
@ Interface XmlTestViewController: UIViewController {
}
@ End
Controller implementation file. A string of the NSString type is declared here. Use the classes defined in code 5 and code 6 to parse them.
Code 4
# Import "XmlTestViewController. h"
# Import "FirstXmlParse. h"
@ Implementation XmlTestViewController

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
-(Void) viewDidLoad {
[Super viewDidLoad];
NSString * xml = @ "<xml>"
"<Title> title </title>"
"<Content> content description </content>"
"<Time> 2011-1-1 </time>"
"</Xml> ";

FirstXmlParse * first = [[FirstXmlParse alloc] init];
[First startParse: xml];
NSLog (@ "title: % @", first. title );
NSLog (@ "content: % @", first. content );
NSLog (@ "time: % @", first. time );
}

/*
// Override to allow orientations other than the default portrait orientation.
-(BOOL) shouldAutorotateToInterfaceOrientation :( UIInterfaceOrientation) interfaceOrientation {
// Return YES for supported orientations
Return (interfaceOrientation = UIInterfaceOrientationPortrait );
}
*/

-(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 {
[Super dealloc];
}
@ End

 
Code 5

# Import <Foundation/Foundation. h>
 
@ Interface FirstXmlParse: NSObject <NSXMLParserDelegate> {
NSString * title;
NSString * content;
NSString * time;
// Define a variable string
NSMutableString * contentString;
}
@ Property (nonatomic, retain) NSString * title;
@ Property (nonatomic, retain) NSString * content;
@ Property (nonatomic, retain) NSString * time;
@ Property (nonatomic, retain) NSMutableString * contentString;
-(Void) startParse :( NSString *) xml;
@ End
Code 6. This is the key to parsing xml files.
# Import "FirstXmlParse. h"

@ Implementation FirstXmlParse
@ Synthesize title;
@ Synthesize content;
@ Synthesize time;
@ Synthesize contentString;

-(Void) startParse :( NSString *) xml {
NSData * data = [xml dataUsingEncoding: NSUTF8StringEncoding];
// Create an xml Parser
NSXMLParser * xmlParse = [[NSXMLParser alloc] initWithData: data];
// Set Delegation
[XmlParse setDelegate: self];
[XmlParse parse];
}

// Starts to parse the document
-(Void) parserDidStartDocument :( NSXMLParser *) parser {
NSLog (@ "Resolution document start ");
}

-(Void) parser :( NSXMLParser *) parser didStartElement :( NSString *) elementName namespaceURI :( NSString *) namespaceURI qualifiedName :( NSString *) qName attributes :( NSDictionary *) attributeDict {
NSLog (@ "start tag: % @", elementName );
Self. contentString = [NSMutableString string];
}

-(Void) parser :( NSXMLParser *) parser foundCharacters :( NSString *) string {
NSLog (@ "encountered content: % @", string );
[Self. contentString appendString: string];
}

-(Void) parser :( NSXMLParser *) parser didEndElement :( NSString *) elementName namespaceURI :( NSString *) namespaceURI qualifiedName :( NSString *) qName {
NSLog (@ "end tag: % @", elementName );
If ([elementName isEqualToString: @ "title"]) {
Title = contentString;
}
If ([elementName isinclutostring: @ "content"]) {
Content = contentString;
}
If ([elementName isEqualToString: @ "time"]) {
Time = contentString;
}
}

// The parsing document ends
-(Void) parserDidEndDocument :( NSXMLParser *) parser {
NSLog (@ "end of document Parsing ");
}
@ End

 

Excerpted from the heart of the cold and buried in the Northern Region