C#使用Aforge调用摄像头拍照的方法

2.编写代码

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.Video.DirectShow;

namespace AforgeDemo
{
  public partial class Form1 : Form
  {
    private FilterInfoCollection videoDevices;
    private VideoCaptureDevice videoDevice;
    private VideoCapabilities[] videoCapabilities;
    private VideoCapabilities[] snapshotCapabilities;
    public Form1()
    {
      InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
      videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
      if (videoDevices.Count != 0)
      {
        foreach (FilterInfo device in videoDevices)
        {
          cmbCamera.Items.Add(device.Name);
        }
      }
      else
      {
        cmbCamera.Items.Add("没有找到摄像头");
      }

      cmbCamera.SelectedIndex = 0;
    }

    private void cmbCamera_SelectedIndexChanged(object sender, EventArgs e)
    {
      if (videoDevices.Count != 0)
      {
        videoDevice = new VideoCaptureDevice(videoDevices[cmbCamera.SelectedIndex].MonikerString);
        GetDeviceResolution(videoDevice);
      }
    }

    private void GetDeviceResolution(VideoCaptureDevice videoCaptureDevice)
    {
      cmbResolution.Items.Clear();
      videoCapabilities = videoCaptureDevice.VideoCapabilities;
      foreach (VideoCapabilities capabilty in videoCapabilities)
      {
        cmbResolution.Items.Add($"{capabilty.FrameSize.Width} x {capabilty.FrameSize.Height}");
      }
      cmbResolution.SelectedIndex = 0;
    }

    private void btnConnect_Click(object sender, EventArgs e)
    {
      if (videoDevice != null)
      {
        if ((videoCapabilities != null) && (videoCapabilities.Length != 0))
        {
          videoDevice.VideoResolution = videoCapabilities[cmbResolution.SelectedIndex];

          vispShoot.VideoSource = videoDevice;
          vispShoot.Start();
          EnableControlStatus(false);
        }
      }
    }

    private void EnableControlStatus(bool status)
    {
      cmbCamera.Enabled = status;
      cmbResolution.Enabled = status;
      btnConnect.Enabled = status;
      btnShoot.Enabled = !status;
      btnDisconnect.Enabled = !status;
    }

    private void btnDisconnect_Click(object sender, EventArgs e)
    {
      DisConnect();
      EnableControlStatus(true);
    }

    private void DisConnect()
    {
      if (vispShoot.VideoSource != null)
      {
        vispShoot.SignalToStop();
        vispShoot.WaitForStop();
        vispShoot.VideoSource = null;
      }
    }

    private void btnShoot_Click(object sender, EventArgs e)
    {
      Bitmap img = vispShoot.GetCurrentVideoFrame();
      picbPreview.Image = img;
    }

    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
      DisConnect();
    }
  }
}
								 
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