xmpp 消息和好友上下线(3)

消息

//收到消息  
- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message{  
      
//    NSLog(@"message = %@", message);  
    //消息的内容 
    NSString *msg = [[message elementForName:@"body"] stringValue]; 
    //消息发送者 
    NSString *from = [[message attributeForName:@"from"] stringValue];  
        
    /****在此处****/
    //通知聊天页面有新消息，需要处理  
      
}

发送消息

//发送消息的xml格式
<message from='发送者账号'
    to='接收者账号'
    type='chat'>
	<body>HELLO WORLD </body>
	</message>

//代码组装

NSString *message = @"HELLO WORLD";
	NSXMLElement *body = [NSXMLElement elementWithName:@"body"];
	[body setStringValue:message];
	
	//生成XML消息文档
	NSXMLElement *mes = [NSXMLElement elementWithName:@"message"];
	//消息类型
	[mes addAttributeWithName:@"type" stringValue:@"chat"];
	//发送给谁
	[mes addAttributeWithName:@"to" stringValue:@"接受者账号"];
	//由谁发送
	[mes addAttributeWithName:@"from" stringValue:@"发送者账号"];
	//组合
	[mes addChild:body];
	
	//发送消息
	[[self xmppStream] sendElement:mes];

好友上下线通知

- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence
{	
    //取得好友状态
    NSString *presenceType = [presence type]; //online/offline
    //当前用户
    NSString *userId = [[sender myJID] user];
    //在线用户
    NSString *presenceFromUser = [[presence from] user];
	/*
	 //如果不是自己，如果涉及多段登录，此处最好加上else，如果是自己离线的话，调用上线协议
	 XMPPPresence *presence = [XMPPPresence presence];
	 [[self xmppStream] sendElement:presence];
	 */
    if (![presenceFromUser isEqualToString:userId])
	{
        //用户在线
        if ([presenceType isEqualToString:@"available"])
		{
			//列表和数据库都要相应改变
        }else if ([presenceType isEqualToString:@"unavailable"])//用户不在线
		{
			//列表和数据库都要相应改变
        }
    }
}