JSON -> Xcode stringformat

Question

I use this method to access my mysql database from Xcode:

NSString *URL = [NSString stringWithFormat:@"http://test.test:8888/test/loadUserData.php?username=%@", userName];

NSString *rawJSON = [[NSString alloc] initWithContentsOfURL:[NSURL URLWithString:URL]];

const char *convert = [rawJSON UTF8String]; NSString *responseString = [NSString stringWithUTF8String:convert];

if ([rawJSON length] == 0) { [rawJSON release];

}

SBJsonParser *parser = [[SBJsonParser alloc] init];

userInfo = [[parser objectWithString:responseString error:nil] copy]; SSN = [userInfo objectAtIndex:0];

[parser release];

return userInfo;

Everything works great. EXCEPT that I can't compare strings in the result with normal nsstrings. If I say

if ([userinfo objectAtIndex:0) == @"Dan") { ..do something }

Xcode never sees that it is the same value.. I don't know if there is something wrong with the format (My database is UTF-8) And how can I convert the result so xCode can compare the response with NSStrings?

Thanks!

What does this have to do with Xcode?

user142019
– user142019

2011-05-16 16:07:15 +00:00
Commented May 16, 2011 at 16:07 — user142019
– user142019, Commented May 16, 2011 at 16:07

Eiko · Accepted Answer · 2011-05-16 15:56:00Z

1

== does not compare the value of strings, it just compares their addresses.

Use

if ([[userinfo objectAtIndex:0] isEqualToString:@"Dan"]) { ... }

or something similar instead.

answered May 16, 2011 at 15:56

Eiko

25.7k15 gold badges58 silver badges71 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Damo Over a year ago

One way to think of it is as - object comparison; your original code was asking, "Is object A equal to object B?". So, instead think, "Are the contents of object A the same as the contents of object B?" Don't forget @"A String" is not actually a string literal it's shorthand for an instance of NSString with contents 'A String'; i.e. an object in it's own right.

Eiko Over a year ago

@user753126 Yes, == compares the pointers/addresses. The variables you throw at == are pointers, i.e. NSString *. So for comparison you always want something like isEqualXXX etc.

Damo · Accepted Answer · 2011-05-16 15:57:12Z

1

If you know for sure that you have string data on both sides of the condition you could use

if ([userinfo objectAtIndex:0] isEqualToString:@"Dan") {
    // summat...
}

answered May 16, 2011 at 15:57

Damo

12.9k3 gold badges54 silver badges63 bronze badges

Collectives™ on Stack Overflow

JSON -> Xcode stringformat

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related