Znaki sterujące o nieskończonej liczbie znaków w NSJSONSerialization

Question

Mam ten JSON http://www.progmic.com/ielts/retrive.php, który muszę przeanalizować. Kiedy robię to z NSJSONSerialization, otrzymuję komunikat "Unescaped control character around character 1981" error.

muszę wiedzieć:

• Co do cholery są Niecytowany znaki kontrolne? Czy istnieje lista lub coś takiego?
• Jak pozbyć się tego błędu? Najłatwiejszy sposób?

Z góry dziękuję.

Answer 1

Dodałem tę metodę do usuwania zmiany znaczenia znaków z pobranym wyrażenie:

- (NSString *)stringByRemovingControlCharacters: (NSString *)inputString 
{ 
    NSCharacterSet *controlChars = [NSCharacterSet controlCharacterSet]; 
    NSRange range = [inputString rangeOfCharacterFromSet:controlChars]; 
    if (range.location != NSNotFound) { 
     NSMutableString *mutable = [NSMutableString stringWithString:inputString]; 
     while (range.location != NSNotFound) { 
      [mutable deleteCharactersInRange:range]; 
      range = [mutable rangeOfCharacterFromSet:controlChars]; 
     } 
     return mutable; 
    } 
    return inputString; 
} 

Po odbiorczej z NSData, przekonwertować go do NSString, zadzwoń powyższej metody, aby otrzymać nowy ciąg z usuniętymi znakami sterowania, a następnie ponownie przekonwertuj nowy NSString na NSData w celu dalszego przetwarzania.

Answer 2

Co robisz przed użyciem NSJSONSerialization? Sprawdź kodowania, może problem leży w tym miejscu.

Szybko spróbowałem i zadziałało. Źródłowy JSON jest poprawny. To co mam, kiedy serializacji tablicy z powrotem do JSON z ładnego wydruku thingy:

[ 
    { 
    "url2": "http://ielts.progmic.com/app/i_COFANewSouthWhales.html", 
    "title": "COFA New South Whales ", 
    "img": "http://ielts.progmic.com/images/uni/1340407904.jpg", 
    "url": "http://ielts.progmic.com/app/COFANewSouthWhales.html", 
    "desc": "The College offers nine undergraduate degrees including some double degrees associated with other UNSW faculties.", 
    "img2": "http://ielts.progmic.com/images/uni/thumb/1340407904.jpg" 
    }, 
    { 
    "url2": "http://ielts.progmic.com/app/i_RoyalCollegeOfArts.html", 
    "title": "Royal College Of Arts ", 
    "img": "http://ielts.progmic.com/images/uni/1340542224.jpg", 
    "url": "http://ielts.progmic.com/app/RoyalCollegeOfArts.html", 
    "desc": "The Royal College of Art (informally the RCA) is a public research university specialised in art and design located in London, United Kingdom. It is the world's only wholly postgraduate university of art and design, offering the degrees of Master of Arts (M.A.), Master of Philosophy (M.Phil.) and Doctor of Philosophy (Ph.D.). It was founded in 1837", 
    "img2": "http://ielts.progmic.com/images/uni/thumb/1340542224.jpg" 
    }, 
    { 
    "url2": "http://ielts.progmic.com/app/i_MIDDLESEXUNIVERSITY.html", 
    "title": "MIDDLESEX UNIVERSITY ", 
    "img": "http://ielts.progmic.com/images/uni/1340410005.jpg", 
    "url": "http://ielts.progmic.com/app/MIDDLESEXUNIVERSITY.html", 
    "desc": "We have a reputation for the highest quality teaching, research that makes a real difference to people’s lives and a practical, innovative approach to working with businesses to develop staff potential and provide solutions to business issues. Our expertise is wide ranging, from engineering, information, health and social sciences, to business, arts and education - and we’re national leaders in work based learning solutions.", 
    "img2": "http://ielts.progmic.com/images/uni/thumb/1340410005.jpg" 
    }, 
    { 
    "url2": "http://ielts.progmic.com/app/i_UNIVERSITYOFSCOTLAND.html", 
    "title": "UNIVERSITY OF SCOTLAND ", 
    "img": "http://ielts.progmic.com/images/uni/1340410189.jpg", 
    "url": "http://ielts.progmic.com/app/UNIVERSITYOFSCOTLAND.html", 
    "desc": " Founded in 1451, Glasgow is the fourth-oldest university in the English-speaking world. Over the last five centuries and more, we’ve constantly worked to push the boundaries of what’s possible. We’ve fostered the talents of seven Nobel laureates, one Prime Minister and Scotland’s inaugural First Minister. We’ve welcomed Albert Einstein to give a lecture on the origins of the general theory of relativity. Scotland’s first female graduates completed their degrees here in 1894 and the world’s first ultrasound images of a foetus were published by Glasgow Professor Ian Donald in 1958. In 1840 we became the first university in the UK to appoint a Professor of Engineering, and in 1957, the first in Scotland to have an electronic computer. All of this means that if you choose to work or study here, you’ll be walking in the footsteps of some of the world’s most renowned innovators, from scientist Lord Kelvin and economist Adam Smith, to the pioneer of television John Logie Baird.", 
    "img2": "http://ielts.progmic.com/images/uni/thumb/1340410189.jpg" 
    } 
] 

można skopiować i wkleić JSON w pliku, zapisz go w różnych kodowań i zobaczyć, co się dzieje z kodem . UTF-8 powinien być drogą do zrobienia.