Analyse de la réponse HTML - Application iPhone

Question

Je crée une application. J'envoie les informations de connexion en utilisant la méthode HTTP POST et la réponse que je reçois du serveur est au format HTML. Comment puis-je analyser ce HTML et ajouter des méthodes différentes pour la succession ou l'échec? Ce que j'essaye de réaliser est, en cas d'échec de connexion, il devrait montrer le message utilisant UIAlerView et en cas de connexion réussie, l'application devrait changer la vue avec l'animation. :)

Le code J'utilise en ce moment:

- (IBAction) loginButton: (id) sender { 
indicator.hidden = NO; 
[indicator startAnimating]; 
loginbutton.enabled = NO; 

// Create the username and password string. 
// username and password are the username and password to login with 
NSString *postString = [[NSString alloc] initWithFormat:@"username=%@&password=%@",userName, password]; 
// Package the string in an NSData object 
NSData *requestData = [postString dataUsingEncoding:NSASCIIStringEncoding]; 

// Create the URL request 
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString:@"http://localhost/dologin.php"]]; // create the URL request 
[request setHTTPMethod: @"POST"]; // you're sending POST data 
[request setHTTPBody: requestData]; // apply the post data to be sent 

// Call the URL 
NSURLResponse *response; // holds the response from the server 
NSError *error; // holds any errors 
NSData *returnData = [NSURLConnection sendSynchronousRequest: request returningResponse:&response error:&error]; // call the URL 

/* If the response from the server is a web page, dataReturned will hold the string of the HTML returned. */ 
NSString *dataReturned = [[NSString alloc] initWithData:returnData encoding:NSASCIIStringEncoding]; 

alertWithOkButton = [[UIAlertView alloc] initWithTitle:@"Status..." message:[NSString stringWithFormat:@"%@",dataReturned] delegate:self cancelButtonTitle:@"Okay" otherButtonTitles:nil]; 
[alertWithOkButton show]; 
[alertWithOkButton release]; 
} 

Answer 1

Ce que j'ai fait exactement est-je classe HTMLParser. Cette classe est très utile si vous obtenez une réponse au format HTML.

Answer 2

-(void)startParsingForLogin:(NSString *)userIdStr Password:(NSString *)passwordStr 
{ 

NSString *urlString = [NSString stringWithFormat:@"http://www.example.com/loginxml.php?username=%@&password=%@",userIdStr,passwordStr]; 
////////NSLog(@"urlString : %@",urlString); 
NSURL *xmlURL = [NSURL URLWithString:urlString]; 

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] initWithURL:xmlURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30.0]autorelease]; 

NSURLResponse *returnedResponse = nil; 
NSError *returnedError = nil; 
NSData *itemData = [NSURLConnection sendSynchronousRequest:request returningResponse:&returnedResponse error:&returnedError]; 
//NSString *itemString = [[[NSString alloc] initWithBytes:[itemData bytes] length:[itemData length] encoding:NSUTF8StringEncoding]autorelease]; 

//////NSLog(@"itemString : %@",itemString); 


xmlParser = [[NSXMLParser alloc] initWithData:itemData];   
[xmlParser setDelegate:self]; 

[xmlParser parse]; 

} 
- (void)parserDidStartDocument:(NSXMLParser *)parser 
{ 
////////NSLog(@"parserDidStartDocument"); 
} 

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError 
{ 
////////NSLog(@"parseErrorOccurred"); 
NSString * errorString = [NSString stringWithFormat:@"Error (Error code %i)", [parseError code]]; 
UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Error loading data" message:errorString delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
[errorAlert show]; 
[errorAlert release]; 
} 

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes: (NSDictionary *)attributeDict 
{ 
////NSLog(@"didStartElement"); 
////NSLog(@"elementName : %@",elementName); 
////NSLog(@"namespaceURI : %@",namespaceURI); 
////NSLog(@"qualifiedName : %@",qualifiedName); 
////NSLog(@"attributeDict : %@",attributeDict); 
[registerNewArr addObject:attributeDict]; 

} 
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 
{ 
////NSLog(@"foundCharacters"); 
} 

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 
{ 
/////NSLog(@"didEndElement"); 
} 
- (void)parserDidEndDocument:(NSXMLParser *)parser 
{ 
}