Parse JSON Facebook Conversations XCODE - xcode

Question

I need your help. I can parse correctly the graph.facebook.com/me/feed JSON, but i can't do it with graph.facebook.com/me/conversations. Can you please help me? this is how i get the last message from feed
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData
options:kNilOptions
error:nil];
NSLog(#"json %#", json);
NSDictionary *items = [json objectForKey:#"data"];
// NSDictionary *item = [items objectAtIndex:1];
NSLog(#"items %#", items);
NSMutableArray *story = [NSMutableArray array];
for (NSDictionary *item in items )
{
if([item objectForKey:#"message"] || [item objectForKey:#"message"] != nil || [[item objectForKey:#"message"] length]>0)
{
[story addObject:[item objectForKey:#"message"]];
}
else{
NSLog(#"no message");
}
}
NSLog(#"story %#", story);
NSString *lastMessage = [story objectAtIndex:0];
NSLog(#"lastmessage received is %#", lastMessage);
Can you please help me? Thanks
EDIT: I get this error in NSString *lastMessage = [story objectAtIndex:0];
* Terminating app due to uncaught exception 'NSRangeException', reason: '* -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for
empty array'
* First throw call stack: (0x341fc2a3 0x3aede97f 0x34147b75 0xc3a1d 0x3add2d91 0x3c22c11f 0x3c22fecf 0x3c22fdc1 0x3c23091d 0x3c230ac1
0x3ae54a11 0x3ae548a4) libc++abi.dylib: terminate called throwing an
exception
NSLog from "items" is the following:
(
{
"can_reply" = 1;
id = "t_id.xx5719286166414";
"is_subscribed" = 1;
link = "http://www.facebook.com/messages/?action=read&tid=id.xx5719286166414";
"message_count" = 4;
messages = {
data = (
{
"created_time" = "2012-11-30T17:53:00+0000";
from = {
email = "1367741936#facebook.com";
id = 1367741936;
name = " xxx xxx";
};
id = "m_msg.fe83b318fa94e6bbcc90a9a52fa4645b01";
message = "Questo \U00e8 un messaggio";
tags = {
data = (
{
name = inbox;
},
{
name = messenger;
},
{
name = read;
},
{
name = "source:mobile";
}
);
};
to = {
data = (
{
email = "100004765716168#facebook.com";
id = 100004765716168;
name = "AccountDevelopment Development";
},
{
email = "1367741936#facebook.com";
id = 1367741936;
name = " xxx xxx";
}
);
};
},
{
"created_time" = "2012-11-29T11:49:00+0000";
from = {
email = "1367741936#facebook.com";
id = 1367741936;
name = " xxx xxx";
};
id = "m_id.128631660627297";
message = "funziona?";
tags = {
data = (
{
name = inbox;
},
{
name = read;
},
{
name = "source:web";
}
);
};
to = {
data = (
{
email = "100004765716168#facebook.com";
id = 100004765716168;
name = "AccountDevelopment Development";
},
{
email = "1367741936#facebook.com";
id = 1367741936;
name = " xxx xxx";
}
);
};
},
{
"created_time" = "2012-11-28T18:05:57+0000";
from = {
email = "1367741936#facebook.com";
id = 1367741936;
name = " xxx xxx";
};
id = "m_id.141590452655798";
message = "prova messaggio";
tags = {
data = (
{
name = inbox;
},
{
name = read;
},
{
name = "source:web";
}
);
};
to = {
data = (
{
email = "100004765716168#facebook.com";
id = 100004765716168;
name = "AccountDevelopment Development";
},
{
email = "1367741936#facebook.com";
id = 1367741936;
name = " xxx xxx";
}
);
};
},
{
"created_time" = "2012-11-28T18:04:50+0000";
from = {
email = "1367741936#facebook.com";
id = 1367741936;
name = " xxx xxx";
};
id = "m_id.xx5719286166414";
message = "Ciao Francesco, come stai?";
tags = {
data = (
{
name = inbox;
},
{
name = read;
},
{
name = "source:web";
}
);
};
to = {
data = (
{
email = "100004765716168#facebook.com";
id = 100004765716168;
name = "AccountDevelopment Development";
},
{
email = "1367741936#facebook.com";
id = 1367741936;
name = " xxx xxx";
}
);
};
}
);
paging = {
next = "https://graph.facebook.com/t_id.xx5719286166414/messages?access_token=BAABlotMxL1MBACbrnuvICOwBKjkw68ZBaqLOY2MVE6tga8xPmiF9VWH7RZAZCoZBDeSD29KWTzuze3xpjP7xb1kmfyw7VYtvGZC0E1gwgJthpZAoKoFXAYanGcBMb1qzO7SBAI3WPLcLAq7yAUpyF9NiHY0vIpsiGJZASx3eZCA83Lm18hpjmo0K97ZBSOiAoYeZCm2vYDgqq4S8jqOvZCvGZCZByNeg4ElNiSwZA1hHqdA6qrFAZDZD&limit=25&until=1354125890&__paging_token=m_id.xx5719286166414";
previous = "https://graph.facebook.com/t_id.xx5719286166414/messages?access_token=BAABlotMxL1MBACbrnuvICOwBKjkw68ZBaqLOY2MVE6tga8xPmiF9VWH7RZAZCoZBDeSD29KWTzuze3xpjP7xb1kmfyw7VYtvGZC0E1gwgJthpZAoKoFXAYanGcBMb1qzO7SBAI3WPLcLAq7yAUpyF9NiHY0vIpsiGJZASx3eZCA83Lm18hpjmo0K97ZBSOiAoYeZCm2vYDgqq4S8jqOvZCvGZCZByNeg4ElNiSwZA1hHqdA6qrFAZDZD&limit=25&since=1354297980&__paging_token=m_msg.fe83b318fa94e6bbcc90a9a52fa4645b01&__previous=1";
};
};
participants = {
data = (
{
email = "1367741936#facebook.com";
id = 1367741936;
name = " xxx xxx";
},
{
email = "100004765716168#facebook.com";
id = 100004765716168;
name = "AccountDevelopment Development";
}
);
};
senders = {
data = (
{
email = "1367741936#facebook.com";
id = 1367741936;
name = " xxx xxx";
}
);
};
snippet = "Questo \U00e8 un messaggio";
tags = {
data = (
{
name = inbox;
},
{
name = read;
},
{
name = seen;
},
{
name = "source:web";
}
);
};
"updated_time" = "2012-11-30T17:53:00+0000";
}
)

Answer 1

You are missing a level in your accessors. The top level item in the JSON is messages, and that contains data. And then data is an array, not a dictionary. So you should change the first lines to this...
NSArray *messageGroups = [json objectForKey:#"data"];
NSDictionary* firstMessageGroup = [messageGroups objectAtIndex:0];
NSDictionary *messages = [firstMessageGroup objectForKey:#"messages"];
NSArray* items = [messages objectForKey#"data"];