c# - 用于网络摄像头的 Aforge

Question

我用两个按钮和一个图片框编写了一个访问网络摄像头的代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using AForge.Imaging;
using AForge.Imaging.Filters;
using AForge.Video;
using AForge.Video.DirectShow;

namespace cam
{
public partial class Form1 : Form
{

    public Form1()
    {
        InitializeComponent();
    }
    private FilterInfoCollection webcam;
    private VideoCaptureDevice cam;
    Bitmap bitmap;

    private void Form1_Load(object sender, EventArgs e)
    {
        webcam = new FilterInfoCollection(FilterCategory.VideoInputDevice);
        foreach (FilterInfo VideoCaptureDevice in webcam)
        {
            comboBox1.Items.Add(VideoCaptureDevice.Name);

        }
        comboBox1.SelectedIndex = 0;
      }

    private void button1_Click(object sender, EventArgs e)
    {
        cam = new VideoCaptureDevice(webcam[comboBox1.SelectedIndex].MonikerString);
        cam.NewFrame += new NewFrameEventHandler(cam_NewFrame);
        cam.Start();

    }
    void cam_NewFrame(object sender, NewFrameEventArgs eventArgs)
    {
        Bitmap bitmap = (Bitmap)eventArgs.Frame.Clone();

        pictureBox1.Image = bitmap;
    }



    private void button3_Click(object sender, EventArgs e)
    {
        if (cam.IsRunning)
        {
            cam.Stop();
        }
    }

    private void pictureBox1_Click(object sender, EventArgs e)
    {
        pictureBox1.Image = bitmap;
    }



    }

 }

代码构建成功。但是在调试图片框时不起作用。启动和停止工作正常。任何人都可以帮忙吗？

Answer 1

你必须先删除

Bitmap bitmap;

因为它是空的，而且你在图片框中显示的不是来自相机的图片

Answer 2

很久以前，我在使用 aforge 时也遇到了问题，但可以在这里查看我的代码：如何初始化 AForge 网络摄像头