我使用迈克ØBrien的HID库连接到数字刻度， 设备成功打开则显示设备附加和放大器;删除邮件完美。但仅运行OnReport约20次初步 经过Inital约20运行在OnReport它永远不会再次运行，除非我断开USB连接线并重新连接。

我的code低于

 如果（scale.IsConnected）
      {
          scale.Inserted + = DeviceAttachedHandler;
          scale.Removed + = DeviceRemovedHandler;
          scale.MonitorDeviceEvents = TRUE;
          scale.ReadReport（OnReport）;
的MessageBox.show（保持应用程序在这里）;
 

事件处理程序的比例

 私人无效DeviceAttachedHandler（）
    {
        的MessageBox.show（设备连接。）;
        scale.ReadReport（OnReport）;
    }

    私有静态无效DeviceRemovedHandler（）
    {
        的MessageBox.show（设备除去。）;
    }
    私人无效OnReport（HidReport报告）
    {
        （！scale.IsConnected）如果{返回; }


        // VAR cardData =新数据（report.Data）;
        小数重量= Convert.ToDecimal（report.Data [4]）; //（Convert.ToDecimal（report.Data [4]）+



        的MessageBox.show（weight.ToString（））;
//Convert.ToDecimal(report.Data[5]）* 256）/ 100;
            ？//Console.WriteLine(!cardData.Error Encoding.ASCII.GetString（car​​dData.CardData）：cardData.ErrorMessage）;
            //Console.WriteLine(report.Data）;
        scale.ReadReport（OnReport）;
    }
 

解决方案

我设法规模的工作，在我的回调其运行时的规模返回的数据我在做读这是一个阻塞调用。因此，一个僵局被创造，应该只使用了 ReadReport 或读看看小李的例子低于他贴< A HREF =htt​​ps://github.com/mikeobrien/HidLibrary/issues/17相对=nofollow>此处。

 使用系统;
使用System.Linq的;
使用System.Text;
使用HidLibrary;

命名空间MagtekCardReader
{
    类节目
    {
        私人const int的厂商ID = 0x0801;
        私人const int的的ProductId = 0×0002;

        私有静态HidDevice _device;

        静态无效的主要（）
        {
            _device = HidDevices.Enumerate（厂商ID，产品）.FirstOrDefault（）;

            如果（_device！= NULL）
            {
                _device.OpenDevice（）;

                _device.Inserted + = DeviceAttachedHandler;
                _device.Removed + = DeviceRemovedHandler;

                _device.MonitorDeviceEvents = TRUE;

                _device.ReadReport（OnReport）;

                Console.WriteLine（读者发现，preSS任意键退出。）;
                Console.ReadKey（）;

                _device.CloseDevice（）;
            }
            其他
            {
                Console.WriteLine（无法找到读者。）;
                Console.ReadKey（）;
            }
        }

        私有静态无效OnReport（HidReport报告）
        {
            （！_device.IsConnected）如果{返回; }

            VAR cardData =新数据（report.Data）;

            Console.WriteLine（cardData.Error Encoding.ASCII.GetString（car​​dData.CardData）：！？cardData.ErrorMessage）;

            _device.ReadReport（OnReport）;
        }

        私有静态无效DeviceAttachedHandler（）
        {
            Console.WriteLine（设备连接。）;
            _device.ReadReport（OnReport）;
        }

        私有静态无效DeviceRemovedHandler（）
        {
            Console.WriteLine（设备除去。）;
        }
    }
}
 

I am using Mike O Brien's HID Library to connect to digital scale, Device opens successfully then displays device attached & removed messages perfectly. But only runs OnReport for about 20 times initially After Inital approx 20 runs on OnReport it never runs again, unless I remove usb cable and re-connect.

My code is below

if (scale.IsConnected)
      {
          scale.Inserted += DeviceAttachedHandler;
          scale.Removed += DeviceRemovedHandler;
          scale.MonitorDeviceEvents = true;
          scale.ReadReport(OnReport);
MessageBox.Show("Hold Application Here");

Event Handlers for the scale

private void DeviceAttachedHandler()
    {
        MessageBox.Show("Device attached.");
        scale.ReadReport(OnReport);
    }

    private static void DeviceRemovedHandler()
    {
        MessageBox.Show("Device removed.");
    }
    private void OnReport(HidReport report)
    {
        if (!scale.IsConnected) { return; }


        //var cardData = new Data(report.Data);
        decimal weight = Convert.ToDecimal(report.Data[4]);// (Convert.ToDecimal(report.Data[4]) +



        MessageBox.Show(weight.ToString());
//Convert.ToDecimal(report.Data[5]) * 256) / 100;
            //Console.WriteLine(!cardData.Error ? Encoding.ASCII.GetString(cardData.CardData) : cardData.ErrorMessage);
            //Console.WriteLine(report.Data);
        scale.ReadReport(OnReport);
    }

I managed to get the scale working, In my callback which runs when scale returns data I was doing Read which is a blocking call. So a deadlock was created, should have only used ReadReport or Read take a look at Mike's example below which he posted here .

using System;
using System.Linq;
using System.Text;
using HidLibrary;

namespace MagtekCardReader
{
    class Program
    {
        private const int VendorId = 0x0801;
        private const int ProductId = 0x0002;

        private static HidDevice _device;

        static void Main()
        {
            _device = HidDevices.Enumerate(VendorId, ProductId).FirstOrDefault();

            if (_device != null)
            {
                _device.OpenDevice();

                _device.Inserted += DeviceAttachedHandler;
                _device.Removed += DeviceRemovedHandler;

                _device.MonitorDeviceEvents = true;

                _device.ReadReport(OnReport);

                Console.WriteLine("Reader found, press any key to exit.");
                Console.ReadKey();

                _device.CloseDevice();
            }
            else
            {
                Console.WriteLine("Could not find reader.");
                Console.ReadKey();
            }
        }

        private static void OnReport(HidReport report)
        {
            if (!_device.IsConnected) { return; }

            var cardData = new Data(report.Data);

            Console.WriteLine(!cardData.Error ? Encoding.ASCII.GetString(cardData.CardData) : cardData.ErrorMessage);

            _device.ReadReport(OnReport);
        }

        private static void DeviceAttachedHandler()
        {
            Console.WriteLine("Device attached.");
            _device.ReadReport(OnReport);
        }

        private static void DeviceRemovedHandler()
        {
            Console.WriteLine("Device removed.");
        }
    }
}