What links a ConnectedDeviceDefinition to an IDevice

[zlittell]

Describe the issue When calling DeviceManager.Current.GetDevicesAsync() sometimes ConnectedDeviceDefinition is null and sometimes it isn't. However, if I call DeviceManager.Current.GetConnectedDeviceDefinitionsAsync() it always retrieves all the ConnectedDeviceDefinitions everytime. I use the definition to display a devices serial and sometimes it works and sometimes it doesn't.

I am not sure if maybe I am just not understanding something correctly or there is some other issue.

Your Code

using Device.Net;
using Hid.Net.Windows;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace USBHIDConsoleDemo
{
    class Program
    {
        static async Task<int> Main()
        {
            DebugLogger dLogger = new DebugLogger();
            DebugTracer dTracer = new DebugTracer();

            Console.WriteLine("Hello World!");
            WindowsHidDeviceFactory.Register(dLogger, dTracer);

            var deviceDefinitions = new List<FilterDeviceDefinition>
            {
                new FilterDeviceDefinition {DeviceType=DeviceType.Hid, VendorId= 0x1209, ProductId=0x9001}
            };

            while (true)
            {
                var devices2 = await DeviceManager.Current.GetDevicesAsync(deviceDefinitions);
                var devices3 = await DeviceManager.Current.GetConnectedDeviceDefinitionsAsync(deviceDefinitions[0]);
                foreach (var temp in devices2)
                {
                    if (temp.ConnectedDeviceDefinition != null)
                    {
                        Console.WriteLine("GetDevices Device: " + temp.ConnectedDeviceDefinition.SerialNumber);
                    }
                }
                foreach (var temp in devices3)
                {
                    Console.WriteLine("GetConnectedDevice Device:" + temp.SerialNumber);
                }
            }
        }
    }
}

Info

• Platform: Windows
• Device Type: HID
• Version: 3.1

[MelbourneDeveloper]

@zlittell Hi. Yes. This call is a little confusing and has been cleaned up in V4.

If you specify no filter definitions to GetConnectedDeviceDefinitionsAsync it should return every device definition. However, GetDevicesAsync doesn't because it might return too many devices.

If the result is inconsistent, that sounds like a bug.

[zlittell]

Sorry I don't think I described it correctly in the first part. I am using filters on both functions. When getting a list of IDevices with GetDevicesAsync(ListofFilters), sometimes the object, ConnectedDeviceDefinition, of the IDevice is set correctly and sometimes its just null. If I get a list of ConnectedDeviceDefinitions using GetConnectedDeviceDefinitionsAsync it always shows the ConnectedDeviceDefinitions correctly.

One solution I have been toying with is just keeping a list of ConnectedDeviceDefinitions and then using GetDevice() with the selected ConnectedDeviceDefinition passed as the argument. It just would be easier to use the list of IDevices, but I have to have the serial so the user can select a device if more than one is plugged in.

[MelbourneDeveloper]

@zlittell ah yes. I think I understand what you are saying. This would be a bug. I would hope this is fixed in version 4 (develop branch) but if not, I will keep this issue open to remind me that it is a problem.

This kind of ties in to some design issues.

Really, this property is not set until you initialize the device. That's a kind of design problem that I will deal with long term.

[zlittell]

Thats fine. I will use the workaround its simple enough. I just wanted to make sure I wasn't doing something wrong. Thanks for the quick response and the amazing work!