C#使用Aforge调用摄像头拍照

一、 新建一个Winform项目

二、使用Nuget添加引用

安装下图中红色框住的两个程序包

安装完后发现安装了如下图的程序包，这是因为上述两个程序包存在对其它程序包的依赖。

三、编写程序

1. 窗体设计，摄像头是下拉列表（cmbCamera，控件命名，下同），虽然示例只用到一个摄像头，但是该Demo可用于多个摄像头间切换场景，分辨率是下拉列表（cmbResolution），列出摄像头所支持的分辨率，一个VideoSourcePlayer控件（vispShoot），一个PictureBox控件（picbPreview）。

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 != )
            {
                foreach (FilterInfo device in videoDevices)
                {
                    cmbCamera.Items.Add(device.Name);
                }
            }
            else
            {
                cmbCamera.Items.Add("没有找到摄像头");
            }

            cmbCamera.SelectedIndex = ;
        }

        private void cmbCamera_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (videoDevices.Count != )
            {
                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 = ;
        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            if (videoDevice != null)
            {
                if ((videoCapabilities != null) && (videoCapabilities.Length != ))
                {
                    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();
        }
    }
}

3. 测试

附上窗体设计代码：

namespace AforgeDemo
{
    partial class Form1
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows 窗体设计器生成的代码

        /// <summary>
        /// 设计器支持所需的方法 - 不要修改
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.label1 = new System.Windows.Forms.Label();
            this.cmbCamera = new System.Windows.Forms.ComboBox();
            this.label2 = new System.Windows.Forms.Label();
            this.cmbResolution = new System.Windows.Forms.ComboBox();
            this.vispShoot = new AForge.Controls.VideoSourcePlayer();
            this.picbPreview = new System.Windows.Forms.PictureBox();
            this.btnConnect = new System.Windows.Forms.Button();
            this.btnDisconnect = new System.Windows.Forms.Button();
            this.btnShoot = new System.Windows.Forms.Button();
            ((System.ComponentModel.ISupportInitialize)(this.picbPreview)).BeginInit();
            this.SuspendLayout();
            //
            // label1
            //
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(, );
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(, );
            this.label1.TabIndex = ;
            this.label1.Text = "摄像头：";
            //
            // cmbCamera
            //
            this.cmbCamera.FormattingEnabled = true;
            this.cmbCamera.Location = new System.Drawing.Point(, );
            this.cmbCamera.Name = "cmbCamera";
            this.cmbCamera.Size = new System.Drawing.Size(, );
            this.cmbCamera.TabIndex = ;
            this.cmbCamera.SelectedIndexChanged += new System.EventHandler(this.cmbCamera_SelectedIndexChanged);
            //
            // label2
            //
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(, );
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(, );
            this.label2.TabIndex = ;
            this.label2.Text = "分辨率：";
            //
            // cmbResolution
            //
            this.cmbResolution.FormattingEnabled = true;
            this.cmbResolution.Location = new System.Drawing.Point(, );
            this.cmbResolution.Name = "cmbResolution";
            this.cmbResolution.Size = new System.Drawing.Size(, );
            this.cmbResolution.TabIndex = ;
            //
            // vispShoot
            //
            this.vispShoot.Location = new System.Drawing.Point(, );
            this.vispShoot.Name = "vispShoot";
            this.vispShoot.Size = new System.Drawing.Size(, );
            this.vispShoot.TabIndex = ;
            this.vispShoot.Text = "videoSourcePlayer1";
            this.vispShoot.VideoSource = null;
            //
            // picbPreview
            //
            this.picbPreview.Location = new System.Drawing.Point(, );
            this.picbPreview.Name = "picbPreview";
            this.picbPreview.Size = new System.Drawing.Size(, );
            this.picbPreview.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
            this.picbPreview.TabIndex = ;
            this.picbPreview.TabStop = false;
            //
            // btnConnect
            //
            this.btnConnect.Location = new System.Drawing.Point(, );
            this.btnConnect.Name = "btnConnect";
            this.btnConnect.Size = new System.Drawing.Size(, );
            this.btnConnect.TabIndex = ;
            this.btnConnect.Text = "连接";
            this.btnConnect.UseVisualStyleBackColor = true;
            this.btnConnect.Click += new System.EventHandler(this.btnConnect_Click);
            //
            // btnDisconnect
            //
            this.btnDisconnect.Enabled = false;
            this.btnDisconnect.Location = new System.Drawing.Point(, );
            this.btnDisconnect.Name = "btnDisconnect";
            this.btnDisconnect.Size = new System.Drawing.Size(, );
            this.btnDisconnect.TabIndex = ;
            this.btnDisconnect.Text = "断开";
            this.btnDisconnect.UseVisualStyleBackColor = true;
            this.btnDisconnect.Click += new System.EventHandler(this.btnDisconnect_Click);
            //
            // btnShoot
            //
            this.btnShoot.Enabled = false;
            this.btnShoot.Location = new System.Drawing.Point(, );
            this.btnShoot.Name = "btnShoot";
            this.btnShoot.Size = new System.Drawing.Size(, );
            this.btnShoot.TabIndex = ;
            this.btnShoot.Text = "拍照";
            this.btnShoot.UseVisualStyleBackColor = true;
            this.btnShoot.Click += new System.EventHandler(this.btnShoot_Click);
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(, );
            this.Controls.Add(this.btnShoot);
            this.Controls.Add(this.btnDisconnect);
            this.Controls.Add(this.btnConnect);
            this.Controls.Add(this.picbPreview);
            this.Controls.Add(this.vispShoot);
            this.Controls.Add(this.cmbResolution);
            this.Controls.Add(this.cmbCamera);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
            this.Load += new System.EventHandler(this.Form1_Load);
            ((System.ComponentModel.ISupportInitialize)(this.picbPreview)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.ComboBox cmbCamera;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.ComboBox cmbResolution;
        private AForge.Controls.VideoSourcePlayer vispShoot;
        private System.Windows.Forms.PictureBox picbPreview;
        private System.Windows.Forms.Button btnConnect;
        private System.Windows.Forms.Button btnDisconnect;
        private System.Windows.Forms.Button btnShoot;
    }
}