Question

i am trying to read a txt file and store it in a NSArray. here is my code, but it seems there is something missing that i don’t know!

NSURL *url=[NSURL URLWithString:@"http://www.google.com/robots.txt"];

    NSMutableArray *robots=[NSMutableArray arrayWithContentsOfURL:url];

    NSLog(@"%@",robots);

Answer 1

You have to load the contents of URL into string first like

NSString *content = [NSString stringWithContentsOfURL:URL encoding:NSUTF8StringEncoding error:nil];

Then split this string like this:

NSArray *parsed = [content componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];

Now parsed array will contain strings from the URL.

Edit:

If you want to filter your array, add this code:

NSIndexSet *indexes = [parsed indexesOfObjectsPassingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop) {
    NSRange range = [(NSString *)obj rangeOfString:@"Disallow"];
    if (range.location != NSNotFound)
    {
        return YES; 
    }
    return NO;
}];

NSArray *disallowed = [parsed objectsAtIndexes:indexes];

disallowed will be populated with the strings that contains Disallow string