Can't detect NSString content because of Formatting

gwelmarten · June 2012

Hi
I'm trying to run an IF command based on the contents of an NSString from the contents of a URL. My current code is:

NSError* error1;
NSString *ifYesMessage = [NSString stringWithContentsOfURL:[NSURL URLWithString:@\"http://freedom-apps.com/branon/mac-desktop-pro/file.txt\"] encoding:NSASCIIStringEncoding error:&error1];
if (ifYesMessage == @\"yes\") {
NSLog(@\"Yes\");
}
else {
NSLog(@\"No\");
}

However, I always get No returned. Implying that the program can't find the yes printed in the text file. Does anybody know why this is? I thought it might be something to do with the encoding, but I've tried changing the encoding of the text file.
The text file literally says "yes". When you view source in Safari, it literally says "yes".

Thanks,
Sam

givensur · June 2012

First, isEqualToString: is how you compare a string. You do not use == to compare strings.

NSString *foo = @\"bar\";

if ([foo isEqualToString:@\"bar\"])
    NSLog(@\"The strings are the same\");
else
    NSLog(@\"The strings are not the same\");

Second, comparing whether or not two strings are equal is not the same thing as checking if one string contains another string. That'd be like expecting (59 == 6592) to return YES ;)

Use rangeOfString: instead.


NSString *myString = @\"The foo man group\";

NSRange fooRange = [myString rangeOfString:@\"foo\"];
if (fooRange.location != NSNotFound)
    NSLog(@\"myString contains foo\");
else
    NSLog(@\"myString has no foo :(\");

Also, when troubleshooting or debugging, don't just start trying things. Evaluate the problem first. For example you could've NSLogged your string you were creating to manually look to see if it contained "yes". Once seeing that you would realize that the encoding is not the problem.

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Can't detect NSString content because of Formatting

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