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Excerpt
hiddentrue

How to find scanners on your network.

Scanner discovery follows a request/response model, whereby the user's application requests scanners that meet certain criteria (it can also request all available scanners), and the scanner(s) respond to the request by sending their ID information. The responses are not guaranteed to be returned in real-time; they're sent via UDP. Consequently, after the request, the functions used for discovering scanners block for approximately one second in order to reasonably ensure that all scanners get their responses in.

Info
titleBest Practice

In general, it is recommended not to we recommend that you do not use the discovery functions in a production application. Instead, it is better to configure your scanners once and store IP addresses and CableIds with your application (e.g., in a settings file or database). For diagnostics and configuration applications, the usage of the discovery functions is fine.

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  • (Example 1c)
Discovering All Scanners – Example 1a

To discover all scanners on a network, use the function in Example 1a above:

Code Block
languagec#
using System.Collections.Generic;
using JoeScan.JCamNet;

namespace Examples
{
    class Program
    {
        static void Main(string[] args)
        {
            List<DiscoveryResponse> responses = ScannerConfig.FindAllScanners();
            foreach (var discoveryResponse in responses)
            {
                System.Console.WriteLine("Base IP Address: {0}, CableId: {1}, Serial Number: {2}", 
                    discoveryResponse.BaseIPAddress,
                    discoveryResponse.CableId,
                    discoveryResponse.SerialNumber );
            }
        }
    }
}
Sample Output: 

 

Code Block
languagec#
themeRDark
Base IP Address: 192.168.1.105, CableId: 0, Serial Number: 374
Base IP Address: 192.168.1.150, CableId: 0, Serial Number: 1465
Base IP Address: 192.168.1.105, CableId: 22, Serial Number: 1941
Base IP Address: 192.168.1.105, CableId: 28, Serial Number: 1940
Base IP Address: 192.168.1.105, CableId: 30, Serial Number: 1747
Querying for a specific scanner by CableId or Serial Number – Example 1b

If you want to query for a specific scanner, either by it's its CableId or Serial serial number, use the second function above: 

...

 

Code Block
themeRDark
 Base IP Address: 192.168.1.150, CableId: 0, Serial Number: 1465

 

Finding scanners by using specific criteria – Example 1c

You can also find scanners by using Another possibility to find scanners is to use a delegate method of type ScannerResponseDelegate, which is called for each DiscoveryResponse received fom from the network. This is useful when you have specific criteria to build the list of scanners you want to adress, address (e.g., all scanners on a specific subnet).

Tip

NoteTip: For proper a more detailed explanation of subnet testing instead of this simplified version, see :  http://en.wikipedia.org/wiki/Subnetwork

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