Json 来自现有 NSData 的结果为 null iOS

Question

我实现了这个方法来从网络服务器json获取数据

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{ 
    magazineJsonArray = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
}

它 returns null 值但是 data 不是一个空对象。我尝试这样做：NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];它 returns 一个 NSString 分为 3 个部分，我不知道如何将我的数据放入 NSDictionary 这是我尝试获取字符串时在日志中得到的内容：

2015-03-23 17:35:15.638 AppTest[5604:70b] str is{"products":[{"id":74,"id_default_image":"351","manufacturer_name":"Bose","price":"449.990000","name":[{"id":"1","value":"BOSE enceinte soundlink mobile + casque AE2I"},{"id":"2","value":"Bose soundlink mobile + helmet AE2I"}]},{"id":76,"id_default_image":"5006","manufacturer_name":"Bose","price":"398.000000","name":[{"id":"1","value":"BOSE Enceintes 301 serie V X2"},{"id":"2","value":"Bose 301 series V X 2"}]},{"id":81,"id_default_image":"380","manufacturer_name":"Bose","price":"649.000000","name":[{"id":"1","value":"BOSE Enceintes freespace 51 (paire)"},{"id":"2","value":"Bose freespace 51 (pair)"}]},{"id":114,"id_default_image":"551","manufacturer_name":"Apple","price":"659.000000","name":[{"id":"1","value":"Iphone 5s 32 Go"},{"id":"2","value":"Apple iphone 5S 32GO OR"}]},{"id":121,"id_default_image":"562","manufacturer_name":"De'Longhi","price":"279.000000","name":[{"id":"1","value":"Machine à café Delonghi lattissima+ Nespresso argent givre EN520S"},{"id":"2","value":"Delonghi lattissima+ nespresso argent givre EN520S"}]},{"id":122,"id_default_image":"564","manufacturer_name":"Kitchen Chef","price":"350.000000","name":[{"id":"1","value":"Kitchen chef ZB06B : fabrique à glaçons, producteur d'eau chaude (90°C) et d'eau froide (moins de 10°C)"},{"id":"2","value":"Kitchen chef ZB06B"}]},{"id":336,"id_default_image":"4733","manufacturer_name":"La Maison de la Truffe","price":"44.000000","name":[{"id":"1","value":"Truffe Entière Extra Spécial 1 Truffe"},{"id":"2","value":"Truffe entiére extra spécial 1 truffe"}]},{"id":387,"id_default_image":"1110","manufacturer_name":"Dior ","price":"21000.000000","name":[{"id":"1","value":"La D de Dior"},{"id":"2","value":"La D de Dior"}]},{"id":389,"id_default_image":"4764","manufacturer_name":"A. 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Answer 1

你初始化 magazineJsonArray 对象了吗？

NSDictionary* magazineJsonArray= [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

我强烈推荐访问以下文章。

https://developer.apple.com/library/prerelease/ios/documentation/Cocoa/Conceptual/Collections/Articles/Dictionaries.html

这是一个例子： Parsing a JSON array with dictionaries

Answer 2

您的对象是 Dictionary，因此您应该为其创建一个 NSDictionary 对象并相应地处理数据。

将来，如果您不知道收到的数据类型，您可以像这样对数据进行类型检查：

+ (id)deserializeJSONfromURL:(NSURL *)url {

    NSError *error = nil;

    NSData *jsonData = [self downloadDataFromURL:url];

    id jsonObject;

    if (jsonData) {
        jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData
                                                        options:NSJSONReadingAllowFragments
                                                          error:&error];
        if (jsonObject && !error) {
            NSLog(@"Success!");
        }
        else if (error) {
            NSLog(@"Failed! Error: %@", [error localizedDescription]);
        }
    }

    return jsonObject;
}

+ (BOOL)isJSONFromURL:(NSString *)urlAsString typeOfClass:(Class)classType {

    id classObject =[classType new];

    NSURL *dataURL = [NSURL URLWithString:urlAsString];

    id jsonObject = [self deserializeJSONfromURL:dataURL];

    if ([jsonObject isKindOfClass:[classType class]]) {
        NSLog(@"The JSON data is %@ class compliant.", [classType description]);
        return YES;
    }

    NSLog(@"The JSON data is not %@ class compliant.", [classType description]);
    classObject = nil;
    jsonObject = nil;

    return NO;
}

并像这样使用它：

if ([MyDeserializerClass isJSONFromURL:@"anURL" typeOfClass:[NSDictionary class]]) {
      //is an NSDictionary compliant. Do something with it.
}

为了快速检查，您可以尝试这样的 NSLog 语句：

NSLog(@"Type of JSON data %@", [[jsonObject class] description]);

Answer 3

数据看起来都很合理，至少开始是这样。

第一步是检查您应该收到的 NSError，您在其中传递了 nil 作为错误参数。那会告诉你哪里出了问题。

有时服务器会发送 JSON 不属于那里的数据。例如，开头或结尾的额外零字节或文本中间的字节顺序标记。如果是这种情况，您需要仔细检查您的数据。例如，检查 NSData 是否包含任何零字节。

Json 来自现有 NSData 的结果为 null iOS

Json result null from existing NSData iOS

json

nsdata

ios