iPhone，JSON 响应中的特殊字符答案

【问题标题】：iPhone, special characters in JSON ResponseiPhone，JSON 响应中的特殊字符
【发布时间】：2010-11-30 23:23:18
【问题描述】：

编写一个 iphone 应用程序，我从返回 JSON 的 REST API 获取数据。我的问题是，一些数据嵌入了特殊字符并且我得到了错误。示例：

MartÌn
Petite-RiviËre-Saint-FranÁois

这是我当前的代码：

NSString *jsonString = [[NSString alloc] 
                            initWithData:receivedData 
                            encoding:NSUTF8StringEncoding];
NSMutableArray *tempResults = [[[jsonString JSONValue] 
                            objectForKey:@"getRegionResortsLastUpdatedResponse"] 
                            objectForKey:@"return"];

只要数据中有特殊字符，“jsonString”就返回“(null)”，否则一切正常。

这是我自己可以处理的事情，还是需要修改 API 才能输出字符代码？

【问题讨论】：

标签： iphone objective-c json api rest

【解决方案1】：

如果-initWithData:encoding: 返回 nil，则几乎可以肯定您的数据未以请求的编码进行编码。我怀疑您没有发送 UTF8，而是发送一些其他编码，例如 Windows 代码页或 Latin1。请参阅NSString documentation 中的字符串编码。

【讨论】：

【解决方案2】：

使用以下函数对您的代码进行编码我这样做并且非常适合我......

+ (NSData*) resolveXmlSpecialEntities:(NSData*)xmlData
{
    if (xmlData == nil) 
        return nil;
    if ([xmlData length] == 0)
        return xmlData;

    NSMutableString* xmlString = [[NSMutableString alloc] initWithData:xmlData encoding:NSUTF8StringEncoding];
    [xmlString replaceOccurrencesOfString:@"&amp;quot;" withString:@"\"" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"&lt;" withString:@"##??##" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"&gt;" withString:@"##?!##" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"&lt;br&gt;" withString:@"##br##" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"&lt;/br&gt;" withString:@"##/br##" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"&lt;b&gt;" withString:@"##b##" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"&lt;/b&gt;" withString:@"##/b##" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"&lt;center&gt;" withString:@"##center##"options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"&lt;/center&gt;" withString:@"##/center##" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"##??##![CDATA[" withString:@"" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"]]##?!##" withString:@"" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"&amp;" withString:@"##ampersand##" options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];
    [xmlString replaceOccurrencesOfString:@"##ampersand##nbsp;" withString:@" " options:NSLiteralSearch range:NSMakeRange(0, [xmlString length])];

    xmlData = [xmlString dataUsingEncoding:NSUTF8StringEncoding];
    [xmlString release];
    return xmlData;
}

+ (NSString*) stringByRemovingResolversInXmlString:(NSString*)xmlString
{
    NSMutableString* stringToChange = [NSMutableString stringWithString:xmlString];

    [stringToChange replaceOccurrencesOfString:@"##??##" withString:@"<" options:NSLiteralSearch range:NSMakeRange(0, [stringToChange length])];
    [stringToChange replaceOccurrencesOfString:@"##?!##" withString:@">" options:NSLiteralSearch range:NSMakeRange(0, [stringToChange length])];
    [stringToChange replaceOccurrencesOfString:@"##br##" withString:@"<br>" options:NSLiteralSearch range:NSMakeRange(0, [stringToChange length])];
    [stringToChange replaceOccurrencesOfString:@"##/br##" withString:@"</br>" options:NSLiteralSearch range:NSMakeRange(0, [stringToChange length])];
    [stringToChange replaceOccurrencesOfString:@"##b##" withString:@"<b>" options:NSLiteralSearch range:NSMakeRange(0, [stringToChange length])];
    [stringToChange replaceOccurrencesOfString:@"##/b##" withString:@"</b>" options:NSLiteralSearch range:NSMakeRange(0, [stringToChange length])];
    [stringToChange replaceOccurrencesOfString:@"##center##" withString:@"<center>"options:NSLiteralSearch range:NSMakeRange(0, [stringToChange length])];
    [stringToChange replaceOccurrencesOfString:@"##/center##" withString:@"</center>" options:NSLiteralSearch range:NSMakeRange(0, [stringToChange length])];
    [stringToChange replaceOccurrencesOfString:@"##ampersand##" withString:@"&" options:NSLiteralSearch range:NSMakeRange(0, [stringToChange length])];

    return [NSString stringWithString:stringToChange];
}

【讨论】：