winform中调用摄像头扫描条形码在文本框中，完整代码和组件

以下是一个调用摄像头扫描条形码并在文本框中显示的WinForm应用程序的完整代码和所需组件：

1. 在项目中添加一个PictureBox控件和一个TextBox控件。

2. 在NuGet包管理器中搜索并安装ZXing.Net包。这是一个用于解码条形码的开源库。

3. 将以下代码添加到Form1.cs文件中：

using System;
using System.Drawing;
using System.Windows.Forms;
using ZXing;

namespace BarcodeScanner
{
    public partial class Form1 : Form
    {
        private readonly Webcam webcam;

        public Form1()
        {
            InitializeComponent();

            // 初始化摄像头
            webcam = new Webcam(pictureBox1);
            webcam.OnCaptured += Webcam_OnCaptured;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // 启动摄像头
            webcam.Start();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            // 停用摄像头
            webcam.Stop();
        }

        private void Webcam_OnCaptured(object source, WebcamEventArgs e)
        {
            // 解码条形码
            var barcodeReader = new BarcodeReader();
            var result = barcodeReader.Decode((Bitmap)e.Frame.Clone());

            if (result != null)
            {
                // 在文本框中显示条形码内容
                textBox1.Invoke(new Action(() => textBox1.Text = result.Text));
            }
        }
    }
}

4. 添加一个名为“Webcam”的新类：

using System;
using System.Drawing;
using System.Windows.Forms;

namespace BarcodeScanner
{
    public class Webcam
    {
        private readonly PictureBox pictureBox;
        private readonly Timer timer;

        public event EventHandler<WebcamEventArgs> OnCaptured;

        public Webcam(PictureBox pictureBox)
        {
            this.pictureBox = pictureBox;
            this.timer = new Timer();
            this.timer.Tick += Timer_Tick;
            this.timer.Interval = 100;
        }

        public void Start()
        {
            var devices = new WebCamLib.VideoCaptureDevices();
            if (devices.Count == 0)
            {
                throw new Exception("No webcam found!");
            }

            var device = devices[0];
            device.VideoResolution = device.SupportedVideoResolutions[0];
            device.Start();

            timer.Start();
        }

        public void Stop()
        {
            timer.Stop();

            var devices = new WebCamLib.VideoCaptureDevices();
            if (devices.Count > 0)
            {
                devices[0].Stop();
            }
        }

        private void Timer_Tick(object sender, EventArgs e)
        {
            var devices = new WebCamLib.VideoCaptureDevices();
            if (devices.Count > 0)
            {
                var device = devices[0];
                var frame = device.GetCurrentFrame();
                pictureBox.Image = frame;

                OnCaptured?.Invoke(this, new WebcamEventArgs(frame));
            }
        }
    }

    public class WebcamEventArgs : EventArgs
    {
        public Bitmap Frame { get; }

        public WebcamEventArgs(Bitmap frame)
        {
            Frame = frame;
        }
    }
}

5. 运行应用程序，将摄像头对准条形码，扫描后条形码内容将显示在文本框中。