从NSURLResponse检测NSStringEncoding的功能？ [英] Function to detect the NSStringEncoding from NSURLResponse?

问题描述

我只是想知道是否有任何现有的类别或任何类型的函数会从NSURLResponse对象返回NSStringEncoding常量。

I just wanted to know if there is any existing category or any sort of function that will return me NSStringEncoding constant out of NSURLResponse object .

我目前面临的问题是，当我将Web服务响应数据转换为String时，我将编码硬编码为NSUTF8StringEncoding，然后它实际上会导致问题，如我的网络服务有时会返回以UTF8编码的响应，有时以ASCII编码（我对所有编码都不太确定，但有时在响应中有其他语言字符，如日语，中文等）

The issue I am facing at the moment is as I have hardcoded the encoding to NSUTF8StringEncoding when I convert the web service response data to String then it actually causes an issue , as my web service sometimes returns the response encoded in UTF8 and sometimes encoded in ASCII ( well I am not too sure about all the encodings though but yes there are sometimes other languages characters in the response like Japanese , Chinese etc )

所以我的想法是在NSURLResponse上有一个类别来检测编码并返回
例如。

So My idea is to have a category on NSURLResponse that detects the encoding and returns eg .

 NSURLResponse * response = // NSURLResponse object ( web service response headers )
 NSData * responseData = // NSData object ( web service response data )
 NSStringEncoding encoding = [response stringEncodingUsed];
 NSString * responseText = [[NSString alloc]initWithData:responseData encoding:encoding];

推荐答案

还有更好的方法。

您可以将URLResponse中的编码名称作为字符串，然后搜索相应的NSStringEncoding。

You can get the encoding name from URLResponse as a string, then search for the appropriate NSStringEncoding.

NSString *encodingName = [aURLResponse textEncodingName];
NSStringEncoding encodingType = CFStringConvertEncodingToNSStringEncoding(CFStringConvertIANACharSetNameToEncoding((CFStringRef)encodingName));

此外 encodingName 可能是零，如果有的话对于提供的 encodingName ， encodingType 变量的结果值无效。

Also encodingName might be nil and if there is no appropriate result for the provided encodingName the result value for the encodingType variable will not be valid.

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