Caratteri di controllo senza escape in NSJSONSerialization

Question

Ho questo JSON http://www.progmic.com/ielts/retrive.php che ho bisogno di analizzare. Quando lo faccio con NSJSONSerialization, ottengo l'errore "Unescaped control character around character 1981".

ho bisogno di sapere:

• Che diamine sono i caratteri di controllo escape? C'è una lista o qualcosa del genere?
• Come si elimina questo errore? La via più facile?

Grazie in anticipo.

Answer 1

ho aggiunto questo metodo per rimuovere i caratteri di escape dalla stringa recuperata:

- (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; 
} 

dopo aver ricevuto il NSData, posso convertire a NSString, chiamare il metodo di cui sopra per ottenere una nuova stringa con i caratteri di controllo rimosso e convertire nuovamente la nuova NSString in NSData per un'ulteriore elaborazione.

Answer 2

Che cosa stai facendo prima di utilizzare NSJSONSerialization? Controlla le codifiche, forse il problema sta lì.

Ho provato rapidamente e ha funzionato. Il JSON di origine è valido. Questo è ciò che ho avuto quando ho serializzare la matrice di nuovo a JSON con la bella thingy di stampa:

[ 
    { 
    "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" 
    } 
] 

è possibile copiare e incollare il JSON in un file, salvarlo in varie codifiche e vedere cosa sta succedendo con il tuo codice . UTF-8 dovrebbe essere la strada da percorrere.