从串行梅特勒托利多数字秤读取重量 [英] Read Weight from a Serial Mettler Toledo Digital Scale

问题描述

我正在尝试从 c# 应用程序中的数字秤读取重量，发现 这个 问题这正是我想要做的但对我来说，下面的函数永远不会运行.

I am trying to read weight from digital scale in c# app, found this question this is exactly what I am trying to do but for me below function never runs.

private void port_DataReceived(object sender, SerialDataReceivedEventArgs e) 
{ 
this.Invoke(new EventHandler(DoUpdate)); 
} 

我已在设备管理器中检查过秤，其位置设置为 Port_#0004.Hub_#0003 并且似乎工作正常我不确定秤的端口号，所以我做了

I have checked the scale in device manager, its location is set to Port_#0004.Hub_#0003 and appear to be working fine I was not sure about port number of the scale so I did

var test = SerialPort.GetPortNames();

并且只有 COM1 被返回

Edit 1: 当我执行 int a = port.ReadByte(); 我的应用程序挂起并且执行永远不会从这个语句向前移动.

Edit 1: When I do int a = port.ReadByte(); my application hangs and execution never moves forward from this statement.

推荐答案

请参阅 this 帖子，我用 Mike 库连接.

Please see this post, I used Mike library to connect.

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.");
        }
    }
}

这篇关于从串行梅特勒托利多数字秤读取重量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！