我需要你的帮助。我可以正确解析 graph.facebook.com/me/feed JSON，但我不能用 graph.facebook.com/me/conversations 来解析。你能帮帮我吗？这就是我从提要中获取最后一条消息的方式
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);
你能帮帮我吗？谢谢
编辑：我在NSString *lastMessage = [story objectAtIndex：0]中收到此错误;
*由于未捕获的异常"NSRangeException"而终止应用程序，原因："* -[__NSArrayM对象索引：]：索引 0 超出边界 空数组' *第一个抛出调用堆栈：（0x341fc2a3 0x3aede97f 0x34147b75 0xc3a1d 0x3add2d91 0x3c22c11f 0x3c22fecf 0x3c22fdc1 0x3c23091d 0x3c230ac1 0x3ae54a11 0x3ae548a4） libc++abi.dylib：终止称为抛出 例外
来自"项目"的 NSLog 如下：
(
{
"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";
}
)
您的访问器中缺少一个级别。JSON 中的顶级项是 messages ，其中包含 data 。然后data是一个数组，而不是字典。所以你应该把第一行改成这个...
NSArray *messageGroups = [json objectForKey:@"data"];
NSDictionary* firstMessageGroup = [messageGroups objectAtIndex:0];
NSDictionary *messages = [firstMessageGroup objectForKey:@"messages"];
NSArray* items = [messages objectForKey@"data"];