Question

我需要解析这个JSON http://www.progmic.com/ielts/retrive.php。当我使用NSJSONSerialization时，我得到“未转义的控制角色围绕角色1981”错误。

我需要知道：

未转义的控制角色究竟是什么？是否有清单或什么？
如何摆脱此错误？最简单的方法？

提前致谢。

Answer 1

我添加了此方法以从检索到的字符串中删除未转义的字符：

- (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; 
}

收到NSData后，我将其转换为NSString，调用上面的方法获取带有删除控制字符的新字符串，然后再将新的NSString转换为NSData进行进一步处理。

Answer 2

在使用NSJSONSerialization之前你在做什么？检查编码，也许问题就在那里。

我很快就尝试过了。源JSON有效。这就是我使用漂亮的打印东西将数组序列化回JSON时得到的结果：

[
  {
    "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"
  }
]

您可以将JSON复制并粘贴到文件中，将其保存为各种编码，然后查看代码的内容。 UTF-8应该是最佳选择。

NSJSONSerialization中未转义的控制字符

2 个答案: