NSData Retaining Old Value -iPhone

Question

I am using the following code to generate and parse the XML. The method [self checksigninSucess]; is called and the UITextField values are set while pressing a "Sign IN" button.

-(void)checksigninSucess{

NSString* content = [NSString stringWithFormat:@"http://www.anball/login_check.php?email=%@&password=%@",emailField.text,passwordField.text];

NSData *xml = [NSData dataWithContentsOfURL: [NSURL URLWithString:content]];

NSLog(@"URLXML %@",[NSURL URLWithString:content]);

self.parser=[NSXMLParser alloc]initWithData:xml];
[self.parser setDelegate:self];
[self.parser parse];
[self.parser release];
self.parser=nil;
}

But my problem is that NSData holds the values which I enter in the text fields for the first time only. When I press the "Sign In" button for the second time with different email and password , NSData holds the same URL it generated before. How can I clear the values held by NSData for the next try.

Are you sure the content string is different the second time? Maybe you are not setting the text field values right? — TheEye, Nov 18 '11 at 10:02
NOP!!When i print the URL ([NSURL URLWithString:content]) in console it gives the modified URL but not the NSData!! — Muhammed Sadiq.HS, Nov 18 '11 at 10:05
refer this link for clear caching http://stackoverflow.com/questions/405151/is-it-possible-to-prevent-an-nsurlrequest-from-caching-data-or-remove-cached-dat — Maulik, Nov 18 '11 at 10:33

score 3 · Accepted Answer · edited Nov 18 '11 at 11:55

3

Why do you need to use NSData? Use NSString instead, as follows.

self.parser=[[NSXMLParser alloc] initWithContentsOfURL:[NSURL URLWithString:content]];

[self.parser setDelegate:self];
[self.parser parse];
[self.parser release];
self.parser=nil;

edited Nov 18 '11 at 11:55

Bert

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answered Nov 18 '11 at 11:45

score 2 · Answer 2 · answered Nov 18 '11 at 10:04

Use this line instead, to prevent Caching of data

NSData *xml = [NSData dataWithContentsOfURL: [NSURL URLWithString:content] options:NSDataReadingUncached error:nil];

Using second variant of function

+ (id)dataWithContentsOfURL:(NSURL *)aURL options:(NSDataReadingOptions)mask error:(NSError **)errorPtr

See NSDataReadingOptions masks

http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSData_Class/Reference/Reference.html#//apple_ref/doc/uid/20000172-307810

please, try to describe how exactly it `does not work` and use less of exclamation marks. We can't help you without you taking part. — Marek Sebera, Nov 18 '11 at 10:17

NSData Retaining Old Value -iPhone

2 Answers2