嗨，我有以下格式的字符串
{
results : [
{
address_components : [
{
long_name : 18,
short_name : 18,
types : [ street_number ]
},
{
long_name : Great Russell Street,
short_name : Great Russell St,
types : [ route ]
},
{
long_name : London,
short_name : London,
types : [ locality, political ]
},
{
long_name : London Borough of Camden,
short_name : London Borough of Camden,
types : [ administrative_area_level_3, political ]
},
{
long_name : Greater London,
short_name : Gt Lon,
types : [ administrative_area_level_2, political ]
},
{
long_name : England,
short_name : England,
types : [ administrative_area_level_1, political ]
},
{
long_name : United Kingdom,
short_name : GB,
types : [ country, political ]
},
{
long_name : WC1B,
short_name : WC1B,
types : [ postal_code_prefix, postal_code ]
},
{
long_name : London,
short_name : London,
types : [ postal_town ]
}
],
formatted_address : 18 Great Russell Street, London WC1B, UK,
geometry : {
location : {
lat : 51.5183152,
lng : -0.1262053
},
location_type : ROOFTOP,
viewport : {
northeast : {
lat : 51.51966418029149,
lng : -0.124856319708498
},
southwest : {
lat : 51.51696621970849,
lng : -0.127554280291502
}
}
},
types : [ street_address ]
},
{
address_components : [
{
long_name : Suite 5,
short_name : Suite 5,
types : [ subpremise ]
},
{
long_name : Russell House,
short_name : Russell House,
types : [ premise ]
},
{
long_name : 37,
short_name : 37,
types : [ street_number ]
},
{
long_name : Great Russell Street,
short_name : Great Russell St,
types : [ route ]
},
{
long_name : Greater London,
short_name : Gt Lon,
types : [ administrative_area_level_2, political ]
},
{
long_name : United Kingdom,
short_name : GB,
types : [ country, political ]
},
{
long_name : WC1B 3PP,
short_name : WC1B 3PP,
types : [ postal_code ]
},
{
long_name : London,
short_name : London,
types : [ postal_town ]
}
],
formatted_address : Suite 5, Russell House, 37 Great Russell Street, London WC1B 3PP, UK,
geometry : {
location : {
lat : 51.517836,
lng : -0.127217
},
location_type : APPROXIMATE,
viewport : {
northeast : {
lat : 51.51918498029149,
lng : -0.125868019708498
},
southwest : {
lat : 51.51648701970849,
lng : -0.128565980291502
}
}
},
types : [ subpremise ]
},
{
address_components : [
{
long_name : WC1B 3DE,
short_name : WC1B 3DE,
types : [ postal_code ]
},
{
long_name : Greater London,
short_name : Gt Lon,
types : [ administrative_area_level_2, political ]
},
{
long_name : United Kingdom,
short_name : GB,
types : [ country, political ]
},
{
long_name : London,
short_name : London,
types : [ postal_town ]
}
],
formatted_address : London WC1B 3DE, UK,
geometry : {
bounds : {
northeast : {
lat : 51.52044859999999,
lng : -0.1257614
},
southwest : {
lat : 51.5184783,
lng : -0.1275254
}
},
location : {
lat : 51.5189698,
lng : -0.1265003
},
location_type : APPROXIMATE,
viewport : {
northeast : {
lat : 51.5208124302915,
lng : -0.1252944197084979
},
southwest : {
lat : 51.5181144697085,
lng : -0.127992380291502
}
}
},
types : [ postal_code ]
},
{
address_components : [
{
long_name : WC1B 3DG,
short_name : WC1B 3DG,
types : [ postal_code ]
},
{
long_name : Greater London,
short_name : Gt Lon,
types : [ administrative_area_level_2, political ]
},
{
long_name : United Kingdom,
short_name : GB,
types : [ country, political ]
},
{
long_name : London,
short_name : London,
types : [ postal_town ]
}
],
formatted_address : London WC1B 3DG, UK,
geometry : {
bounds : {
northeast : {
lat : 51.52044859999999,
lng : -0.1257614
},
southwest : {
lat : 51.5184783,
lng : -0.1275254
}
},
location : {
lat : 51.5189698,
lng : -0.1265003
},
location_type : APPROXIMATE,
viewport : {
northeast : {
lat : 51.5208124302915,
lng : -0.1252944197084979
},
southwest : {
lat : 51.5181144697085,
lng : -0.127992380291502
}
}
},
types : [ postal_code ]
},
{
address_components : [
{
long_name : WC1B,
short_name : WC1B,
types : [ postal_code_prefix, postal_code ]
},
{
long_name : Greater London,
short_name : Gt Lon,
types : [ administrative_area_level_2, political ]
},
{
long_name : United Kingdom,
short_name : GB,
types : [ country, political ]
},
{
long_name : London,
short_name : London,
types : [ postal_town ]
}
],
status : OK
}
如何formatted_address从上面的字符串中检索值
我尝试了以下方式，但得到了 null 。
NSData* data = [stringvalue dataUsingEncoding:NSUTF8StringEncoding];
NSError* error;
NSDictionary* json = [NSJSONSerialization //getting NULL here
JSONObjectWithData:data
options:NSJSONReadingMutableContainers
error:&error];
//The results from Google will be an array obtained from the NSDictionary object with the key "results".
NSArray* places = [json objectForKey:@"results"];
for (int i=0; i<[places count]; i++)
{
NSDictionary* addr = [places objectAtIndex:i];
NSDictionary *loc = [addr objectForKey:@"formatted_address"];
NSLog(@"loc=%@",loc);
}
}