AFORGE库学习之封装对摄像头的操作

       今天开始使用 aforge库对摄像头的操作进行封装。涉及的操作有：打开摄像头，拍照，关闭摄像头。

         我把这些操作封装到一个DLL中。 

----------------------准备工作

       1，  添加引用AFORGE库的DLL：

AForge.Video.dll;

AForge.Video.DirectShow.dll;

        添加名称空间

using AForge.Video;
using AForge.Video.DirectShow;

      2，添加引用：这个是系统有的，在添加引用的 .net 下面

system.drawing.dll;

      添加名称空间:

using System.Drawing;

----------------------DLL源码

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 Webcam;

using AForge.Controls;
using AForge.Video;
using AForge.Video.DirectShow;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        private VideoCaptureDevice video;
        private Bitmap bitmap;

        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// ---窗口加载函数
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {
            string[] videoDevicesName = WebcamHelper.VideoDevicesName();
            foreach (string item in videoDevicesName)
            {
                comboBox1.Items.Add(item);
            }
            comboBox1.SelectedIndex = 0;
        }

        /// <summary>
        /// ---连接摄像头
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void connBtn_Click(object sender, EventArgs e)
        {
            video = WebcamHelper.ConnectWebam(comboBox1.SelectedIndex);
            video.NewFrame += new NewFrameEventHandler(Cam_NewFrame);
        }
        ///------自定义函数，捕获每一帧图像并显示  
        private void Cam_NewFrame(object obj, NewFrameEventArgs eventArgs)
        {
            bitmap = (Bitmap)eventArgs.Frame.Clone();
            pictureBox1.Image = bitmap;
           ///---回收资源  
            GC.Collect();
        }

        /// <summary>
        /// ---断开连接
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void closeBtn_Click(object sender, EventArgs e)
        {
            WebcamHelper.DisConnectWebcam(ref video);
        }

        /// <summary>
        /// --窗口关闭函数
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (video != null)
            {
                ///---关闭摄像头  
                if (video.IsRunning)
                {
                    video.Stop();
                }
            }  
        }

        /// <summary>
        /// ---拍照函数
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void captureBtn_Click(object sender, EventArgs e)
        {
            ///---定义图片的路径
            ///---设置图像的名称和格式。   
            string filepath =Application.StartupPath + DateTime.Now.ToString("yyyy-MM-dd hh-mm-ss") + ".jpg";  

            if (true == WebcamHelper.SaveCapturePicture(ref bitmap, filepath, 200, 100))
            {
                MessageBox.Show("图片保存成功");
            }
            else
            {
                MessageBox.Show("图片保存失败");
            }
        }  
    }
}

----------------------使用DLL示例

  1，添加引用：自己写的DLL（Webcam.dll）

   2，源码：

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 Webcam;

using AForge.Video;
using AForge.Video.DirectShow;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        private VideoCaptureDevice video;
        private Bitmap bitmap;

        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// ---窗口加载函数
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {
            string[] videoDevicesName = WebcamHelper.VideoDevicesName();
            foreach (string item in videoDevicesName)
            {
                comboBox1.Items.Add(item);
            }
            comboBox1.SelectedIndex = 0;
        }

        /// <summary>
        /// ---连接摄像头
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void connBtn_Click(object sender, EventArgs e)
        {
            video = WebcamHelper.ConnectWebam(comboBox1.SelectedIndex);
            video.NewFrame += new NewFrameEventHandler(Cam_NewFrame);
        }
        ///------自定义函数，捕获每一帧图像并显示  
        private void Cam_NewFrame(object obj, NewFrameEventArgs eventArgs)
        {
            bitmap = (Bitmap)eventArgs.Frame.Clone();
            pictureBox1.Image = bitmap;
           ///---回收资源  
            GC.Collect();
        }

        /// <summary>
        /// ---断开连接
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void closeBtn_Click(object sender, EventArgs e)
        {
            WebcamHelper.DisConnectWebcam(ref video);
        }

        /// <summary>
        /// --窗口关闭函数
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (video != null)
            {
                ///---关闭摄像头  
                if (video.IsRunning)
                {
                    video.Stop();
                }
            }  
        }

        /// <summary>
        /// ---拍照函数
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void captureBtn_Click(object sender, EventArgs e)
        {
            ///---定义图片的路径
            ///---设置图像的名称和格式。   
            string filepath =Application.StartupPath + DateTime.Now.ToString("yyyy-MM-dd hh-mm-ss") + ".jpg";  

            if (true == WebcamHelper.SaveCapturePicture(ref bitmap, filepath, 200, 100))
            {
                MessageBox.Show("图片保存成功");
            }
            else
            {
                MessageBox.Show("图片保存失败");
            }
        }  
    }
}