我正在向AFHTTPClient的实例发送以下消息。我希望成功块被发送一个Foundation对象(字典),但调试器向我显示JSON是一个_NSCFData对象。 This question on SO声明我需要将Accept标头设置为'application / json'。好吧,我正在这样做,但AFNetworking仍然没有在响应体中解码JSON。如果我使用NSJSONSerialization自己解码json,我会得到一个我期望的NSDictionary。我做错了什么?
[client setDefaultHeader:@"Accept" value:@"application/json"];
[client postPath:@"/app/open_connection/"
parameters:params
success:^(AFHTTPRequestOperation *operation, id JSON) {
NSLog(@"successful login! %@", [JSON valueForKeyPath:@"status"]);
}
failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"error opening connection");
NSAlert *alert = [NSAlert alertWithError:error];
[alert runModal];
}
];
注意:我正在使用Django在Python中编写服务器。响应的内容类型是'application / json'
答案 0 :(得分:6)
当您使用AFHTTPClient
和JSON API时,通常需要设置所有这三个设置:
httpClient.parameterEncoding = AFJSONParameterEncoding;
[httpClient setDefaultHeader:@"Accept" value:@"application/json"];
[httpClient registerHTTPOperationClass:[AFJSONRequestOperation class]];
现在,当您使用客户端发出请求时,它会知道将响应解析为JSON。
[httpClient postPath:@"/app/open_connection/"
parameters:params
success:^(AFHTTPRequestOperation *operation, id response) {
NSLog(@"JSON! %@", response);
}
failure:^(AFHTTPRequestOperation *operation, NSError *error) {
}];
这也是我发现的一个技巧。在NSError
对象中,您可以解析它并检索错误消息(如果HTTP响应有JSON错误消息):
failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSDictionary *JSON =
[NSJSONSerialization JSONObjectWithData: [error.localizedRecoverySuggestion dataUsingEncoding:NSUTF8StringEncoding]
options: NSJSONReadingMutableContainers
error:nil];
failureCallback(JSON[@"message"]);
}
答案 1 :(得分:3)
试试这个...我认为您的客户端设置可能有问题。
NSMutableURLRequest *request = [client requestWithMethod:@"POST" path:@"/app/open_connection/" parameters:params];
AFJSONRequestOperation *operation =
[AFJSONRequestOperation JSONRequestOperationWithRequest:request
success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
NSLog(@"successful login! %@", [JSON valueForKeyPath:@"status"]);
}
failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(@"error opening connection");
NSAlert *alert = [NSAlert alertWithError:error];
[alert runModal];
}];
[operation start];