使用 Objective C/Cocoa 对 unicode 字符进行转义，即 u1234

问题描述

我从中获取数据的某些站点返回 UTF-8 字符串，其中转义了 UTF-8 字符，即:u5404u500bu90fd

Some sites that I am fetching data from are returning UTF-8 strings, with the UTF-8 characters escaped, ie: u5404u500bu90fd

是否有内置的可可函数可以帮助解决这个问题，或者我是否必须编写自己的解码算法.

Is there a built in cocoa function that might assist with this or will I have to write my own decoding algorithm.

推荐答案

没有内置函数来做 C 转义.

There is no built-in function to do C unescaping.

您可以使用 NSPropertyListSerialization 作弊，因为旧文本样式"plist 支持通过 Uxxxx 进行 C 转义:

You can cheat a little with NSPropertyListSerialization since an "old text style" plist supports C escaping via Uxxxx:

NSString* input = @"ab"cA"BC\u2345\u0123";

// will cause trouble if you have "abc\\uvw"
NSString* esc1 = [input stringByReplacingOccurrencesOfString:@"\u" withString:@"\U"];
NSString* esc2 = [esc1 stringByReplacingOccurrencesOfString:@""" withString:@"\""];
NSString* quoted = [[@""" stringByAppendingString:esc2] stringByAppendingString:@"""];
NSData* data = [quoted dataUsingEncoding:NSUTF8StringEncoding];
NSString* unesc = [NSPropertyListSerialization propertyListFromData:data
                   mutabilityOption:NSPropertyListImmutable format:NULL
                   errorDescription:NULL];
assert([unesc isKindOfClass:[NSString class]]);
NSLog(@"Output = %@", unesc);

但请注意，这不是很有效.如果您编写自己的解析器，那就更好了.(顺便说一句，您在解码 JSON 字符串吗?如果是，您可以使用 现有的 JSON 解析器.)

but mind that this isn't very efficient. It's far better if you write up your own parser. (BTW are you decoding JSON strings? If yes you could use the existing JSON parsers.)

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