解析 JSON Facebook 对话 XCODE
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【中文标题】解析 JSON Facebook 对话 XCODE【英文标题】：Parse JSON Facebook Conversations XCODE 【发布时间】：2012-12-03 18:45:00 【问题描述】：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。你能帮我么？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 objectAtIndex:]：索引 0 超出范围 空数组' * 第一次抛出调用栈：(0x341fc2a3 0x3aede97f 0x34147b75 0xc3a1d 0x3add2d91 0x3c22c11f 0x3c22fecf 0x3c22fdc1 0x3c23091d 0x3c230ac1 0x3ae54a11 0x3ae548a4) libc++abi.dylib: 终止调用抛出一个 异常
“项目”中的 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";
)
【问题讨论】：
我已经编辑了我的帖子。谢谢。 【参考方案1】：您的访问器中缺少一个级别。 JSON 中的***项目是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样……
NSArray *messageGroups = [json objectForKey:@"data"];
NSDictionary* firstMessageGroup = [messageGroups objectAtIndex:0];
NSDictionary *messages = [firstMessageGroup objectForKey:@"messages"];
NSArray* items = [messages objectForKey@"data"];
【讨论】：
感谢您的回答，但它不起作用。这就是我得到的：code 2012-12-04 18:35:38.126 WebView[700:5a03] items (null) 2012-12-04 18:35:38.129 WebView[700:5a03] story ( ) 2012-12-04 18:35:38.132 WebView[700:5a03] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array' *** First throw call stack: (0x335332a3 0x3a21597f 0x3347eb75 0xdb9cd 0x3a109d91 0x3b56311f 0x3b566ecf 0x3b566dc1 0x3b56791d 0x3b567ac1 0x3a18ba11 0x3a18b8a4) libc++abi.dylib: terminate called throwing an exception
messages 是否包含有效对象。可以记录吗？
2012-12-05 10:24:20.372 WebView[191:6a03] messages (null)
对不起，我以为你在记录 json 对象。我想我现在已经修复了代码
对不起，没有。我收到此错误2012-12-05 18:40:58.182 WebView[1418:8a63] -[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x1eda56b0 2012-12-05 18:40:58.184 WebView[1418:8a63] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x1eda56b0' *** First throw call stack: (0x334532a3 0x3a13597f 0x33456e07 0x33455531 0x333acf68 0x68d73 0x3a029d91 0x3b48311f 0x3b486ecf 0x3b486dc1 0x3b48791d 0x3b487ac1 0x3a0aba11 0x3a0ab8a4) libc++abi.dylib: terminate called throwing an exception以上是关于解析 JSON Facebook 对话 XCODE的主要内容，如果未能解决你的问题，请参考以下文章
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