980228 - 如何通过curl获得部分响应？ [英] 980228 - how to get a portion of the response by curl?

问题描述

通过curl获取网址会导致无限响应。当我在浏览器中打开URL时，将开始无限的文件下载。该url属于相机，其通知相机上发生的事件，如运动检测等。但它不是一个请求/一个响应的形式。它采用一个请求/无限响应的形式。为此，我需要剪切输出以获得--boundary之间的一段。除了描述我给出了一个例子：

Fetching a url by curl causes an unlimited response. When I open the url in the browser, an endless file download will start. The url belongs to a camera which informs about events which occurs on the camera like motion detection and so on. But it's not in the form of one-request/one-response. It's in the form of one-request/unlimited-response. For this, I need to cut the output to get just a segment between "--boundary"'s. In addition to the description I'm giving an example:

--boundary
Content-Type: application/xml; charset="UTF-8"
Content-Length: 480

<EventNotificationAlert version="2.0" xmlns="http://www.std-cgi.com/ver20/XMLSchema">
<ipAddress>192.168.14.227</ipAddress>
<portNo>80</portNo>
<protocol>HTTP</protocol>
<macAddress>b8:41:5f:02:81:45</macAddress>
<channelID>1</channelID>
<dateTime>2019-05-18T17:15:02+03:30</dateTime>
<activePostCount>0</activePostCount>
<eventType>videoloss</eventType>
<eventState>inactive</eventState>
<eventDescription>videoloss alarm</eventDescription>
</EventNotificationAlert>
--boundary
Content-Type: application/xml; charset="UTF-8"
Content-Length: 480

<EventNotificationAlert version="2.0" xmlns="http://www.std-cgi.com/ver20/XMLSchema">
<ipAddress>192.168.14.227</ipAddress>
<portNo>80</portNo>
<protocol>HTTP</protocol>
<macAddress>b8:41:5f:02:81:45</macAddress>
<channelID>1</channelID>
<dateTime>2019-05-18T17:15:02+03:30</dateTime>
<activePostCount>0</activePostCount>
<eventType>videoloss</eventType>
<eventState>inactive</eventState>
<eventDescription>videoloss alarm</eventDescription>
</EventNotificationAlert>
--boundary

我尝试过：



在介绍之后，我的问题是：如何使用curl只获取第一个边界而不要等到响应结束，因为它永远不会结束？每当我看到第一个 - 边界时，我都需要切割。另一种解决方案是定义一个回调函数来获取url作为响应发送的所有内容并处理它并保留信息。怎么做？

What I have tried:

After this introduction, my problem is: how to use curl to get only the first boundary and don't wait until the response ends, because it never ends? I need to cut whenever I see the first "--boundary". Another solution instead of cutting is to define a callback function to fetch everything the url sends as response and process it and keep the info. How to do both?

推荐答案

引用：

网址属于相机

您需要阅读相机附带的说明。



比如，要发送什么消息来获得你想要的东西。

You need to read the instructions that came with the "camera".

Like, what "message" to send to get what you want.

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