SIP(7):读UAS的程序(EXOSIP_CALL_INVITE和EXOSIP_CALL_ACK部分)
程序会在最后面贴出。
--------------------------------------------------------------------------------------------
程序开始没别的说，根据官方指南必须要进行eXosip的初始化，
&TRACE_INITIALIZE (6,
stdout);&&
&i=eXosip_init();
&if (i!=0)
return -1;
&i = eXosip_listen_addr (IPPROTO_UDP, NULL,
5060, AF_INET, 0);
&if (i!=0)
eXosip_quit();
fprintf (stderr, "could not initialize transport layer\n");
return -1;
----------------------------------------------------------------------------------------
1、Int eXosip_init (void)：初始化扩展的oSIP库
2、int eXosip_listen_addr
&transport,
&& const char *
& 监听特定的socket
& transport&UDP时为IPPROTO_UDP.
(TCP/TLS会在后面版本完善)
& addr&需要绑定的地址.
(NULL：对于所有接口)
& port&监听的端口.
(0是对于一个随机的端口)&本程序设为了5060
& family&IP协议族 (AF_INET 或者
AF_INET6).
& secure&0：UDP 或者 TCP, 1：TLS
(with TCP).
3、TRACE_INITIALIZE (6, stdout)：待查，此过程应该是为了初始化osip
trace,可能在osip2的介绍中能查找
----------------------------------------------------------------------------------------
接下来应该需要从eXosip2协议中得到eXosip事件
eXosip_event_t *
& for ( ; ; )
je = eXosip_event_wait (0, 50);
eXosip_lock();
eXosip_automatic_action ();
eXosip_unlock();
if (je == NULL)
if (je-&type == EXOSIP_CALL_NEW)
else if (je-&type == EXOSIP_CALL_ACK)
else if (je-&type == EXOSIP_CALL_ANSWERED)
else .....
eXosip_event_free(je);
----------------------------------------------------------------------------------------
1.eXosip_event_t数据结构：在eXosip.h中有语句typedef struct
eXosip_event& eXosip_event_t
为现有类型创建一个新的名称，表明eXosip_event_t实际就是结构体eXosip_event，在官方Data
Structures中有如下说明：
eXosip_event_type_t& type ——事件类型
char& textinfo [256] ——事件的文字描述
void *& external_reference ——待查，另外void*是什么意思？osip_message_t
*& request ——目前transaction中的requestosip_message_t
*& response ——目前transaction中的last responseosip_message_t
*& ack ——目前transaction中的ackint& tid
——transaction的识别idint& did
dialog的识别idint& rid ——注册的识别idint& cid
——SIP calls的识别id(but multiple
dialogs!)int& sid ——unique id for outgoing subscriptions
int& nid ——unique id
for&incoming
subscriptionsint& ss_status
——current Subscription-State for
subscription int& ss_reason
——current Reason status for
subscription
下面对事件类型再进行描述，定义下述枚举变量：
enum&& eXosip_event_type
& EXOSIP_REGISTRATION_NEW, ——宣称新的注册
& EXOSIP_REGISTRATION_SUCCESS, ——用户成功注册
& EXOSIP_REGISTRATION_FAILURE, ——用户没有注册
& EXOSIP_REGISTRATION_REFRESHED, ——注册已经更新
& EXOSIP_REGISTRATION_TERMINATED, ——UA is not
registred any more
& EXOSIP_CALL_INVITE, ——宣布新的呼叫
& EXOSIP_CALL_REINVITE, ——announce a new INVITE
within call&
& EXOSIP_CALL_NOANSWER, ——announce no answer
within the timeout&
& EXOSIP_CALL_PROCEEDING,——announce processing by
a remote app&
& EXOSIP_CALL_RINGING,
& EXOSIP_CALL_ANSWERED,
& EXOSIP_CALL_REDIRECTED,
& EXOSIP_CALL_REQUESTFAILURE,
& EXOSIP_CALL_SERVERFAILURE,
& EXOSIP_CALL_GLOBALFAILURE,
& EXOSIP_CALL_ACK,
& EXOSIP_CALL_CANCELLED,
& EXOSIP_CALL_TIMEOUT,
& EXOSIP_CALL_MESSAGE_NEW,
& EXOSIP_CALL_MESSAGE_PROCEEDING,
& EXOSIP_CALL_MESSAGE_ANSWERED,
& EXOSIP_CALL_MESSAGE_REDIRECTED,
& EXOSIP_CALL_MESSAGE_REQUESTFAILURE,
& EXOSIP_CALL_MESSAGE_SERVERFAILURE,
& EXOSIP_CALL_MESSAGE_GLOBALFAILURE,
& EXOSIP_CALL_CLOSED,
& EXOSIP_CALL_RELEASED,
& EXOSIP_MESSAGE_NEW,
& EXOSIP_MESSAGE_PROCEEDING,
& EXOSIP_MESSAGE_ANSWERED,
& EXOSIP_MESSAGE_REDIRECTED,
& EXOSIP_MESSAGE_REQUESTFAILURE,
& EXOSIP_MESSAGE_SERVERFAILURE,
& EXOSIP_MESSAGE_GLOBALFAILURE,
& EXOSIP_SUBSCRIPTION_UPDATE,
& EXOSIP_SUBSCRIPTION_CLOSED,
& EXOSIP_SUBSCRIPTION_NOANSWER,
& EXOSIP_SUBSCRIPTION_PROCEEDING,
& EXOSIP_SUBSCRIPTION_ANSWERED,
& EXOSIP_SUBSCRIPTION_REDIRECTED,
& EXOSIP_SUBSCRIPTION_REQUESTFAILURE,
& EXOSIP_SUBSCRIPTION_SERVERFAILURE,
& EXOSIP_SUBSCRIPTION_GLOBALFAILURE,
& EXOSIP_SUBSCRIPTION_NOTIFY,
& EXOSIP_SUBSCRIPTION_RELEASED,
& EXOSIP_IN_SUBSCRIPTION_NEW,
& EXOSIP_IN_SUBSCRIPTION_RELEASED,
& EXOSIP_NOTIFICATION_NOANSWER,
& EXOSIP_NOTIFICATION_PROCEEDING,
& EXOSIP_NOTIFICATION_ANSWERED,
& EXOSIP_NOTIFICATION_REDIRECTED,
& EXOSIP_NOTIFICATION_REQUESTFAILURE,
& EXOSIP_NOTIFICATION_SERVERFAILURE,
& EXOSIP_NOTIFICATION_GLOBALFAILURE,
& EXOSIP_EVENT_COUNT
2、eXosip_event_wait
：等待一个eXosip事件，timeout的秒数使用第一个参数，微秒使用第二个参数。
3、 eXosip_lock();待查：原句为un/Lock the eXtented oSIP
library.难道是为了锁定使用Osip库？有说是为了同步，但是不懂。
&&&&eXosip_unlock();
eXosip_automatic_action ();待查：Initiate some automatic
actions:Retry with credentials upon reception of 401/407. Refresh
REGISTER and SUBSCRIBE before the expiration delay. Retry with
Contact header upon reception of 3xx request.
----------------------------------------------------------------------------------------
下面完善那个case，当然，这里由于篇幅，只给出我们UAC发过来有响应的部分：
case EXOSIP_CALL_INVITE:
//得到接收到消息的具体信息
&&&&&&&&&&&printf
("Received a INVITE msg from %s:%s, UserName is %s, password is
%s\n",je&request-&req_uri-&host,
je-&request-&req_uri-&port,
je-&request-&req_uri-&username,
je-&request-&req_uri-&password);
//得到消息体,认为该消息就是SDP格式.
remote_sdp = eXosip_get_remote_sdp (je-&did);
call_id = je-&
dialog_id = je-&
eXosip_lock ();
eXosip_call_send_answer (je-&tid, 180, NULL);
i = eXosip_call_build_answer (je-&tid, 200,
if (i != 0)
printf ("This request msg is invalid!Cann't response!\n");
eXosip_call_send_answer (je-&tid, 400, NULL);
snprintf (tmp, 4096,
&&&&&&&&&&&&&&
&&&&&&&&&&&&&&
"o=anonymous 0 0 IN IP4 0.0.0.0\r\n"
&&&&&&&&&&&&&&
"t=1 10\r\n"
&&&&&&&&&&&&&&
"a=username:rainfish\r\n"
&&&&&&&&&&&&&&
"a=password:123\r\n");
//设置回复的SDP消息体,下一步计划分析消息体
//没有分析消息体，直接回复原来的消息，这一块做的不好。
osip_message_set_body (answer, tmp, strlen(tmp));
osip_message_set_content_type (answer, "application/sdp");
eXosip_call_send_answer (je-&tid, 200,
printf ("send 200 over!\n");
eXosip_unlock ();
//显示出在sdp消息体中的attribute 的内容,里面计划存放我们的信息
printf ("the INFO is :\n");
while (!osip_list_eol (
&(remote_sdp-&a_attributes),
sdp_attribute_t *
at = (sdp_attribute_t *) osip_list_get (
&remote_sdp-&a_attributes,
printf ("%s : %s\n", at-&a_att_field,
at-&a_att_value);//这里解释了为什么在SDP消息体中属性a里面存放必须是两列
----------------------------------------------------------------------------------------
看到这里已经无力吐槽了，电脑待机回寝室吧。
继续。。。。
插入&&今天开会老师透露了好消息，希望能找到专业人士给我们培训一下，毕竟这样在电脑前单干效率太低，希望能早点到位；另外今天也找到对osip各处有解释的网站：
继续正文：
1、&je-&request为osip_message_t的指针，其中osip_message_t结构如下：
char * &sip_version
osip_uri_t * &req_uri
char * &sip_method
int &status_code
char * &reason_phrase
osip_list_t * &accepts
osip_list_t * &accept_encodings
osip_list_t * &accept_languages
osip_list_t * &alert_infos
osip_list_t * &allows
osip_list_t * &authentication_infos
osip_list_t * &authorizations
osip_call_id_t * &call_id
osip_list_t * &call_infos
osip_list_t * &contacts
osip_list_t * &content_dispositions
osip_list_t * &content_encodings
osip_content_length_t * &content_length
osip_content_type_t * &content_type
osip_cseq_t * &cseq
osip_list_t * &error_infos
osip_from_t * &from
osip_mime_version_t * &mime_version
osip_list_t * &proxy_authenticates
osip_list_t * &proxy_authentication_infos
osip_list_t * &proxy_authorizations
osip_list_t * &record_routes
osip_list_t * &routes
osip_to_t * &to
osip_list_t * &vias
osip_list_t * &www_authenticates
osip_list_t * &headers
osip_list_t * &bodies
int &message_property
char * &message
size_t &message_length
void * &application_data
2、其中osip_uri_t结构中包含下述内容
char * &scheme
char * &username
char * &password
char * &host
char * &port
osip_list_t * &url_params
osip_list_t * &url_headers
char * &string
3、函数int eXosip_call_build_answer& (
int& tid,&
& osip_message_t **&
用来对request建立默认的应答
参数说明：
tid:要回复transaction&的id号；我认为客户端和服务端的transaction
id号应该是一样的。直接从eXosip_event_wait&获得的je内容可以得到。
status：状态码，用代码来表示处理请求的一个结果，第一个数字表示应答的类型，接下来两个数字不作为分类使用。
answer：要建立的sip 应答。&
4、函数int eXosip_call_send_answer& (
int& tid,&
& osip_message_t *&
对invite发送应答
参数说明：
tid：transaction的id号；
status：response status if answer is NULL. (not allowed for
answer：要发送的sip应答。
5、函数sdp_message_t* eXosip_get_remote_sdp& (
int& did )&
从最近的call invite中获取SDP body
参数:会话的dialog id
至于sdp_message_t的结构在，但是我看了也没看出什么花来，而且示例程序中也没有具体使用到这个，所以也就不罗列。
6、函数int osip_message_set_body( osip_message_t *
sip,&const char * buf,
&size_t&length)
& 作用：fill the body of the message
参数：sip The structure to store results.
& & & buf The
pointer to the start of body.
& & & length
7、函数int osip_message_set_content_type( osip_message_t * sip,
&const char * hvalue)&
作用：Set the Content-type header.
参数：sip The element to work on.
& & & hvalue
The string describing the element.
8、现在说说程序里的snprintf{char *buffer,size_t count,const char*
format}函数,就是把后面的一堆东西放入到buffer里面。count是指最大存储的字符（包含\0!!）
需要头文件&stdio.h&,网上查了一下，在Windows下是_snprintf,在Linux下是snprintf,这里就用到三个参数。其实个人觉得也可以用C语言中的strcpy和strcat就可以解决了，而且他们也支持类似strcpy(buffer,"ad""afas""....""....")之类的，也许是为了多系统的兼容性吧，猜想，哈哈。
但是需要注意，上述函数都有个特点，就是在字符串里面输入\r相当于ASC ii中的CR（13），\n相当于ASC
ii中的LF(10)。而在DOS和Windows采用换行加回车表示下一行CR+LF,而Unix和Linux采用换行符LF表示下一行。所以查看buffer可以看到，要换行需要用两个符号的空间。
9、函数&int osip_list_eol &(
const osip_list_t * li, & &int
作用：Check if the end of list is
detected（就是看pos所指是不是list的末尾，个人是这么理解的）&&&
参数：li The element to work on.
& & & pos The
index of the possible element.
10、函数&void* osip_list_get ( const osip_list_t *
li,&int pos)
作用：&Get
an element from a list.等下要去看看这里list有什么东西有什么作用
参数：li The element to work on.
& pos the index of the element to
11、好了，看看这个osip_list结构，就两个参数：
&&nb_elt ：表中元素的个数
__node_t * node
& ：指向下个元素（感觉就像链表）
12、至于程序中将提出的元素转化成sdp_attribute_t结构
描述：SDP attribute
defination：SDP属性定义
参数：char* sdp_attribute::a_att_field: attribute
sdp_attribute::a_att_value: attribute value (optional)
13、在程序中感觉客户端是先直接回复了，在去分析SDP信息，这一点原来程序的注释中也有标明其不足，需要注意。另外分析到现在基本上整个框架就可以出来了，下一步把客户端的程序看了，知道各个用户信息是如何加到我们的结构体中的，SDP里面放的到底是什么信息。就是弄明白何种信息放到何种结构体，这样就可以利用这些结构体来联系各个界面数据库什么的了。希望后面顺利吧^_^~~
已投稿到：
以上网友发言只代表其个人观点，不代表新浪网的观点或立场。Sledgehammer’s Cancelled ‘Call of Duty’ Game Had ‘Dead Space’ Moments
Published 10 months ago
, Updated May 19th, 2014 at 8:31 am,
Before helping
finish up development on Call of Duty: Modern Warfare 3, developer Sledgehammer Games was working on their own Call of Duty title. The game was set during the Vietnam War and, unlike all of the previous games in the franchise, it deployed a .
However, once their work was completed on , Sledgehammer was offered an opportunity they couldn’t pass up: the chance to develop an official entry in the
franchise. If they said yes, the developer would be added to the fold as a third studio responsible for delivering Call of Duty games on its new . But, with that opportunity came the death of their third person spin-off.
is nearing the end of development on their first COD franchise entry, , the developer is looking back on what could have been – sharing previously unknown details regarding their third person shooter and why the game ultimately would have never worked.
As part of their Advanced Warfare cover story for , Sledgehammer Games tells the publication that while their third person shooter would have used the Vietnam war as its backdrop it would not have featured familiar terrain. Rather, as studio co-founders Glen Schofield and Michael Condrey explain, their game would have used Cambodia as a major setting. What’s more, the two devs say that their game featured some “ moments” as players navigate the “dense jungles” of Cambodia.
“I don’t mean that from sci-fi, I mean that was a war that was scary for the [American soldiers]. They didn’t know if in the jungle there was a booby trap, or what was in those tunnels. And there were thousands of miles of tunnel underground. It was a hidden war, right? Everybody thought the war was in Vietnam, but it was in Cambodia and Laos. So we were telling a cool story.”
Unfortunately, while their work on the Call of Duty spin-off helped Sledgehammer Games, time away from the project showed a major flaw. The team discovered that, while unique, the game would be hard to market outside of the United States, as many countries view the Vietnam War, or rather America’s War, as an unpopular event in history. Obviously that’s true for US residents as well, but apparently the setting might have hurt the game from a marketing perspective, and therefore Sledgehammer decided it best to let the project ride off into the sunset.
“We found out as we were researching it as well, all around the world it’s actually known as America’s war. Not Vietnam’s. We were the only ones that called it the Vietnam War. It’s kind of unpopular. And we didn’t really understand the marketing aspect of that.”
While it’s interesting to consider what could have been, the focus is now on Advanced Warfare, which represents a major turning point for the franchise. For starters, this is the first, truly
in the billion-dollar franchise, boasting a new, sharper graphics engine. It also features some top tier talent in the form of , who plays Jonathan Irons in the game.
But most of all, Advanced Warfare is a chance for Call of Duty to course correct sales-wise with a new developer and a somewhat fresh concept. We’ll see whether Sledgehammer’s decision to take on proper Call of Duty games was a wise one when Advanced Warfare hits in November.
Do you wish that Sledgehammer had continued their work on the third person Call of Duty? Or was the concept of a game set during Vietnam not as appealing?
Sledgehammer’s new game, Call of Duty: Advanced Warfare, releases November 4, 2014 for the PC, PS3, PS4, Xbox 360, and Xbox One.
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TODAY’S HOT STORIES
April 2015 Release Schedule
GAME REVIEWS
GAME TRAILERSpeople will appreciate _____if an appointment is cancelled.a you to call them b that you are calling themc that you would call them d your calling them_百度作业帮
people will appreciate _____if an appointment is cancelled.a you to call them b that you are calling themc that you would call them d your calling them
appreciate vt. 感激,欣赏常用结构1）appreciate sth.
I really appreciate your help.（不加人做宾语）2)appreciate doing sth
I really appreciate your helping me.(不加to do不定式)3)加从句 得先加形式宾语it再接从句 如 I would appreciate it if you can help me.以上句子是appreciate 后接sth.做宾语,应是 appreciate your calling them
选C，虚拟语气，表示假设的状况。高频词，一定要记得哦！
英['kaens?l]
美['kaens?l]
v. 取消；抵消； 划掉n. 取消，撤销
We cancelled our appointment.
我们取消了约会。
The game was cancelled because of the rain.
比赛因为下雨而取消了。
Her kindness and generosity cancel out her occasional flashes of temper.
她为人厚道、慷慨大方，倒也弥补了她偶尔发点儿脾气。
These two figures cancel each other.
这两数彼此对消。
He cancelled his order for the goods.
他取消了货物订单。
The US has agreed to cancel debts totalling $10 million.
美国已同意免除总额为1000万元的税。
He cancelled many unnecessary words in his manuscript.
他把他原稿上许多不需要的字删去。
You should cancel this preposition in the sentence.
你应该删去句子中的这个介词。
Could you cancel some stamps sticking on the postcards for me too?
你还能给我盖销一些贴在明信片上的邮票吗？
The post office cancels the stamps on a letter.
邮局盖戳注销信件上的邮票。
Some screens only have cancel buttons, with no instructions on how to move forward.
有些屏幕只有取消按钮，而没有提示如何进一步操作。
You can see the “cancel” link next to it, in plain text.
你可以看到 “取消”链接以纯文本方式放在它的旁边。
Do you have any cancels?
你有退票吗？
1.postpone indefinitely or annul something that was scheduled
Call off the engagement
cancel the dinner party
we had to scrub our vacation plans
scratch that meeting--the chair is ill
2.make up for
His skills offset his opponent's superior strength
3.d make ineffective
Cancel the election results
strike down a law
4.remove or make invisible
Please delete my name from your list
5.make invalid for use
cancel cheques or tickets
1.a notation cancelling a previous sharp or flat
只有登录后，才能查看此项，现在是否？
1.To cancel an appointment
2.Can you cancel a date with decorum?
你能够有礼貌地取消约会吗?
3.Do you have any cancels?
你有退票吗？
4.To cancel ( countermand ) an order
取消订货、撤销订单
5.The methods are cancellation tests.
采用的方法为删除试验。
abolish,cancel,repeal
这些动词均含“取消、废除”之意正式用词，指彻底废除某种制度、规章或习俗。用法广泛，多指取消债务、合同、证书、比赛、旅行、计划或约会等。书面用词，指撤销立法机关通过的协议、法案或法律等。
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