How to pase a JSON array in iphone sdk? - iphone

Question

I have a login form where the user can login only with the valid memberID and password. If the user enter correct enamel and password i get a result string contains the user information that the user created in the signup process, if it the password is wrong it shows the status 400 as the result string, the result string is the json array which contains one f the above values, one thing is the if the success login occur it gives the staus 200 along with the user information, my need is to retrieve the status message from the array and i need to validate it within the app, if the login success(status 200) it needs to be redirected to the main page; if it is(status 400) it shows a unsuccessful login message.
my code:
EDit
-(IBAction)_clicksbtnsignIN:(id) sender
{
[_txtmemberId resignFirstResponder];
[_txtpassword resignFirstResponder];
NSString *connectionstring = [[NSString alloc]initWithContentsOfURL:[NSURL URLWithString:#"http://www.google.com"]];
if ([connectionstring length]==0) {
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"Error" message:#"you are not connected to the internet" delegate:self cancelButtonTitle:#"ok" otherButtonTitles:nil];
[alert show];
[alert release];
}
else
{
//NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSString *emailString = _txtmemberId.text; // storing the entered email in a string.
// Regular expression to checl the email format.
NSString *emailReg = #"[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailReg];
//[pool drain];
if (_txtmemberId.text.length == 0 || _txtpassword.text.length == 0) {
UIAlertView *alertblnk = [[UIAlertView alloc]initWithTitle:#"ALERT" message:#"Fill the required text fields" delegate:self cancelButtonTitle:#"ok" otherButtonTitles:nil];
[alertblnk show];
[alertblnk release];
}
if (([emailTest evaluateWithObject:emailString] != YES) || [emailString isEqualToString:#""])
{
UIAlertView *loginalert = [[UIAlertView alloc] initWithTitle:#" Alert" message:#"Invalid Email ID" delegate:self
cancelButtonTitle:#"OK" otherButtonTitles:nil];
[loginalert show];
[loginalert release];
}
else {
[_spinner startAnimating];
NSString *uname = _txtmemberId.text;
NSString *pwd = _txtpassword.text;
NSString *urlVal = #"http://dev.eltouchapps.net/api/?app=1&type=m1&action=t2&var1=";
NSString *urlVal1 = [urlVal stringByAppendingString:uname];
NSString *urlVal2 = [urlVal1 stringByAppendingString:#"&var2="];
NSString *urlVal3 = [urlVal2 stringByAppendingString:pwd];
NSString * encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL,(CFStringRef)urlVal3,NULL, (CFStringRef)#"\n" "",kCFStringEncodingUTF8 );
NSURL *url = [NSURL URLWithString:encodedString];
NSString *resultString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
UIAlertView *loginalert = [[UIAlertView alloc] initWithTitle:#" Message" message:resultString delegate:self
cancelButtonTitle:#"OK" otherButtonTitles:nil];
[loginalert show];
[loginalert release];
lblresult.text = resultString;
NSString *responseString = [resultString responseString];
NSLog(#"Got Profile: %#", responseString);
NSMutableDictionary *responseJSON = [responseString JSONValue];
NSString *firstName;
if ([[responseJSON valueForKey:#"Status"] isEqualToString:#"200"]) // if success
{
ParallelReadViewController *detailViewController = [[ParallelReadViewController alloc] initWithNibName:#"ParallelReadViewController" bundle:nil];
//detailViewController.firstString = firstString;
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
// do something
firstName = [responseJSON valueForKey:#"FirstName"];
}
}
}
}
Result string is why i get from the server. I know there is parsing of JSONB array we want , but i didn't know how to done this.
Thanks in advance.

Answer 1

based on assumption of your response , try below code
NSString *resultString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
NSMutableDictionary *responseJSON = (NSMutableDictionary *)[responseString JSONValue];
NSString *firstName;
if ([[responseJSON valueForKey:#"Status"] isEqualToString:#"200"]) // if success
{
// do something
firstName = [responseJSON valueForKey:#"FirstName"];
}
Hope it gives you an idea.

Answer 2

Check out this JSON framework: https://github.com/stig/json-framework/