解析HTML响应 - iPhone App

Question

我正在创建一个应用程序。我使用HTTP POST方法发送登录信息，并且我从服务器获得的回复是HTML格式。我如何解析HTML并添加不同的继承或失败方法？我试图实现的是，在登录失败时，它应该使用UIAlerView显示消息，并且在成功登录后，应用程序应该使用动画更改视图。 :)

我现在使用的代码：

- (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

我所做的到底是我用过的HTMLParser类。如果您以HTML格式获得响应，此类非常有用。

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 
{ 
}