如何从 ejabberd 数据包对象中获取数据？

Posted 2023-03-15

【中文标题】如何从 ejabberd 数据包对象中获取数据？

【英文标题】：How to get data from ejabberd packet object?

【发布时间】：2020-02-20 14:22:30

【问题描述】：

我有一个包含数据包数据的打印日志，我使用Packet#message.sub_els 提取子元素，它给了我这样的数组：

[
    xmlel,<<"delay">>,[<<"xmlns">>,<<"urn:xmpp:delay">>,<<"stamp">>,<<"2019-10-24T08:08:15.126+00:00">>],[],
    xmlel,<<"type">>,[<<"xmlns">>,<<"urn:xmpp:media">>],[xmlcdata,<<"1">>],
    xmlel,<<"media">>,[<<"xmlns">>,<<"urn:xmpp:data">>],[xmlcdata,<<"null">>],
    xmlel,<<"extra">>,[<<"xmlns">>,<<"urn:xmpp:extra">>],[xmlcdata,<<"\"type\":\"chat\",\"id\":\"5d666434ae920b04875c0a57\",\"name\":\"X003\",\"username\":\"x003\",\"status\":\"\",\"profile_picture\":\"\"">>],
    xmlel,<<"request">>,[<<"xmlns">>,<<"urn:xmpp:receipts">>],[],
    xmlel,<<"request">>,[<<"xmlns">>,<<"urn:xmpp:read">>],[]
],

我想要额外的类型，媒体，额外的。等等

【参考方案1】：

我有一些方法，我已经提取了必要的数据和属性值。

AllElm = Packet#message.sub_els,
    ?INFO_MSG("BinaryData ~p",[fxml:element_to_binary(AllElm)]),
    ?INFO_MSG("PacketsData ~p",[AllElm]),
    %Test = fxml:get_path_s(Packet, [elem, <<"type">>]),
Delay = fxml:get_path_s(xmpp:encode(Packet), [elem,list_to_binary("delay"), attr, list_to_binary("stamp")]),
    ?INFO_MSG("PacketsDataDelay ~p",[Delay]),
Type = fxml:get_path_s(xmpp:encode(Packet), [elem,list_to_binary("type"), cdata]),
    ?INFO_MSG("PacketsDataType ~p",[Type]),
Media = fxml:get_path_s(xmpp:encode(Packet), [elem,list_to_binary("media"), cdata]),
    ?INFO_MSG("PacketsDataMedia ~p",[Media]),
Extra = fxml:get_path_s(xmpp:encode(Packet), [elem,list_to_binary("extra"), cdata]),
    ?INFO_MSG("PacketsDataExtra ~p",[Extra]),