字符 0 周围的值无效，NSJSONSerialization

我从我的服务器获取并得到有效的响应：

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    // Append the new data to the instance variable you declared
    
    
    //[_responseData appendData:data];
    
    NSString *responseBody = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"%@",responseBody);
    
    if(data != NULL)
    {
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,
                                                 (unsigned long)NULL), ^(void) {
        
        NSError *error = nil;
        //NSMutableArray *jsonArray = [[CJSONDeserializer deserializer] deserializeAsArray:[responseBody dataUsingEncoding:NSUTF8StringEncoding] error:&error];
            NSMutableArray *jsonArray = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
        if (error)
        {
            NSLog(@"JSONObjectWithData error: %@", error);
            [delegate onErrorGetArrayFromServer];
        }
        else
        [self parseJSON:jsonArray];
        
        });
        
    }
    else
    {
        if([delegate respondsToSelector:@selector(onErrorGetArrayFromServer)])
        {
            [delegate onErrorGetArrayFromServer];
        }
    }
}

响应如下：

[{
        "id": "37",
        "id_estado": "1",
        "id_categoria": "1",
        "nombre": "fer",
        "email": "[email protected] /cdn-cgi/l/email-protection",
        "fecha": "2014-07-16 11:25:00",
        "observaciones": "as dasd asdasd sasd",
        "latitud": "37.619636",
        "longitud": "-4.318449",
        "foto": "images\/default.jpg"
    },

    {
        "id": "36",
        "id_estado": "1",
        "id_categoria": "6",
        "nombre": "Fernando",
        "email": "",
        "fecha": "2014-07-16 10:32:45",
        "observaciones": "que",
        "latitud": "37.6178690439634",
        "longitud": "-4.3238141387701",
        "foto": "images\/default.jpg"
    }
 ]

###它向我抛出错误：###

JSONObjectWithData error: Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (Invalid value around character 0.) UserInfo=0x9e0f610 {NSDebugDescription=Invalid value around character 0.}

我尝试过其他图书馆（CJSON）它给我带来了错误：

JSONObjectWithData error: Error Domain=kJSONScannerErrorDomain Code=-202 "Could not scan array. Could not scan a value." UserInfo=0xa15c0e0 {snippet=!HERE>![{"id":"37","id_esta, location=0, NSLocalizedDescription=Could not scan array. Could not scan a value., character=0, line=0}

我的服务器是 REST 服务器，对于我的 Android 应用程序运行良好。

SOLVED

感谢@Himanshu Joshi：

为什么要解析 didReceiveData: 中的数据？那里的数据没有完全下载，你必须在那里附加数据。解析connectionDidFinishLoading:委托方法中的数据 –

我解析了数据connectionDidFinishLoading:一切都很顺利。

我遇到了同样的问题，但这是因为我的初始 URL 不正确。

在解析 JSON 之前需要检查响应。它可能会告诉您没有找到它。

此时数据实际上可以包含 404 HTML 页面。

我使用这些方法来调试它，并使用更简单的方法来处理网络请求：

// Asynchronous fetch the JSON and call the block when done
NSURLSessionDataTask *downloadTask =
[[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error) 
{
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;

    if ([httpResponse statusCode]!=200) 
    {
        // log [response  description]
        // log [NSString stringWithUTF8String:[data bytes]] 
        return;
    }

    NSDictionary* jsonDic =     
        [NSJSONSerialization JSONObjectWithData:data
                             options:NSJSONReadingAllowFragments
                             error:&error];

    if (!jsonDic) 
    {
        return;
    }
    // process the JSON
}];
[downloadTask resume];