XMPP：如何解析 XMPPMessage 元素

Question

我从 xmpp

收到的每条消息都采用以下 xml 格式

- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message
{
 NSLog(@"Message %@",message);        
}

在控制台中打印

<message
    xmlns="jabber:client" from="10000006956@xmpp-dev.peeks.com" to="10000006956@xmpp-dev.peeks.com/mobile">
    <result
        xmlns="urn:xmpp:mam:tmp" id="1483781596098940">
        <forwarded
            xmlns="urn:xmpp:forward:0">
            <message
                xmlns="jabber:client" from="10000006931@xmpp-dev.peeks.com/mobile" to="10000006956@xmpp-dev.peeks.com" type="chat">
                <body>Hi</body>
                <delay
                    xmlns="urn:xmpp:delay" from="xmpp-dev.peeks.com" stamp="2016-12-22T04:50:17.023Z">Offline Storage
                </delay>
            </message>
            <delay
                xmlns="urn:xmpp:delay" from="xmpp-dev.peeks.com" stamp="2017-01-07T09:33:16.099Z">
            </delay>
        </forwarded>
    </result>
</message>

我想从每条消息中获取 "from"、"to"、"body" 和 "stamp"，我做了以下

NSXMLElement *body = message;
    NSXMLElement *messageb  = [body elementForName:@"result" xmlns:@"urn:xmpp:mam:tmp"];
    NSXMLElement *forwa=[messageb elementForName:@"forwarded" xmlns:@"urn:xmpp:forward:0"];
    NSXMLElement *msg=[forwa elementForName:@"message" xmlns:@"jabber:client"];
    NSXMLElement *TD=[forwa elementForName:@"delay" xmlns:@"urn:xmpp:delay"];

    NSString *from=[[msg elementForName:@"from" xmlns:@"jabber:client"] stringValue];
    NSString *to=[[msg elementForName:@"to" xmlns:@"jabber:client"] stringValue];
    NSString *bodyq=[[msg elementForName:@"body"] stringValue];
    NSString *stmp=[[TD elementForName:@"stamp" xmlns:@"urn:xmpp:delay"] stringValue];
    NSString *final=[NSString stringWithFormat:@"From: %@\nTo: %@\nBody: %@\nStamp: %@",from,to,bodyq,stmp];
    NSLog(@"forwa %@", final);

我可以只打印邮件正文和日志打印

From: (null)
To: (null)
Body: hi
Stamp: (null)

Answer 1

修复搜索属性：元素是节点（如主体、结果等），而其他元素只是先前元素的属性。

NSString *from=[[msg attributeForName:@"from"] stringValue];
    NSString *to=[[msg attributeForName:@"to"] stringValue];
    NSString *stmp=[[TD attributeForName:@"stamp"] stringValue];

已编辑（抱歉，我上次使用 ObjectiveC 的作品真的很旧）。

xml namespace 是关于 element 而不是 attributes。

如果没有再次获取，请尝试通过 NSXMLNode

NSXMLNode *fromNode = [msg attributeForName:@"from"];
NSString *from = [fromNode stringValue];

Answer 2

对于swift 5:

func xmppStream(_ sender: XMPPStream, didReceive message: XMPPMessage) {
        if let msg = message.body {
            if let from = message.attribute(forName: "from")?.stringValue{
                print("msg: \(msg), \(from)")
            }
        }
    }

XMPP：如何解析 XMPPMessage 元素

XMPP: How to parse XMPPMessage element

objective-c

xmpp

nsxmlelement