如何在C#中发现onvif设备 [英] How to discover onvif devices in C#

问题描述

我正在开发一个应用程序，该应用程序将探测连接到网络上的ONVIF设备以进行自动发现.根据ONVIF Core规范，Probe消息的SOAP格式为:

I'm developing an application that will probe ONVIF devices attached on network for auto-discovery. According to ONVIF Core specification SOAP format of Probe message is :

 <?xml version="1.0" encoding="UTF-8"?>
<e:Envelope xmlns:e="http://www.w3.org/2003/05/soap-envelope"
xmlns:w="http://schemas.xmlsoap.org/ws/2004/08/addressing"
xmlns:d="http://schemas.xmlsoap.org/ws/2005/04/discovery"
xmlns:dn="http://www.onvif.org/ver10/network/wsdl">
<e:Header>
<w:MessageID>uuid:84ede3de-7dec-11d0-c360-f01234567890</w:MessageID>
<w:To e:mustUnderstand="true">urn:schemas-xmlsoap-org:ws:2005:04:discovery</w:To>
<w:Action
a:mustUnderstand="true">http://schemas.xmlsoap.org/ws/2005/04/discovery/Pr
obe</w:Action>
</e:Header>
<e:Body>
<d:Probe>
<d:Types>dn:NetworkVideoTransmitter</d:Types>
</d:Probe>
</e:Body>
</e:Envelope>

我如何在WCF中发送此消息以发现onvif设备?

How can i send this message in WCF to discover onvif deivce?

推荐答案

只需使用

Just use the WCF web service discovery features. ONVIF follows the same standard as that implemented by WCF. You'll need to use the DiscoveryClient class to send the probe.

距我已经有一段时间了，所以它可能并不完全正确，但是您的代码应类似于以下内容.多播探针将找到所有可发现的设备.您可以通过检查事件处理程序中每个响应的元数据来检测onvif设备是否已响应.如果仍然无法获得响应，则可能是网络或设备问题.如果确实得到答复，则可以优化查找条件以仅通知所需的类型.

It's been a while since I've done it so it might not be exactly right but your code should look something like the following. The multicast probe will find all discoverable devices. You can detect if your onvif device has responded by inspecting the metadata for each response in the event handler. If you're still unable to get a response its probably a network or device issue. If you do get a response you can refine your find criteria to only notify of required types.

class Program
{
    static void Main(string[] args)
    {
        var endPoint = new UdpDiscoveryEndpoint( DiscoveryVersion.WSDiscoveryApril2005 );

        var discoveryClient = new DiscoveryClient(endPoint);

        discoveryClient.FindProgressChanged += discoveryClient_FindProgressChanged;

        FindCriteria findCriteria = new FindCriteria();
        findCriteria.Duration = TimeSpan.MaxValue;
        findCriteria.MaxResults = int.MaxValue;
        // Edit: optionally specify contract type, ONVIF v1.0
        findCriteria.ContractTypeNames.Add(new XmlQualifiedName("NetworkVideoTransmitter",
            "http://www.onvif.org/ver10/network/wsdl"));

        discoveryClient.FindAsync(findCriteria);

        Console.ReadKey();
    }

    static void discoveryClient_FindProgressChanged(object sender, FindProgressChangedEventArgs e)
    {
        //Check endpoint metadata here for required types.

    }
}

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