c# 使用AForge.NET操作攝像頭操作代碼

c# 使用AForge.NET操作攝像頭操作代碼
AForge.NET是一個專門為開發者和研究者基于C#框架設計的，這個框架提供了不同的類庫和關于類庫的資源，還有很多應用程序例子，包括計算機視覺與人工智能，圖像處理，神經網絡，遺傳算法，機器學習，機器人等領域。 根據網上的方法，運行程序攝像頭出來了，但是怎么截圖呢？找到一個顯示圖片方法如下

private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)

       {

           Bitmap img = (Bitmap)eventArgs.Frame.Clone();

           //do processing here

           pictureBox1.Image = img;

       }

</pre> 開始參考這句代碼寫了：
private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)

       {

           Bitmap img = (Bitmap)eventArgs.Frame.Clone();

           string imgPath = dirc + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";

           img.Save(imgPath);

       }

</pre> 但是點擊截圖程序就自動不停截了大量的圖片，最后導致程序出問題。想了一個笨方法，可以只截一次圖：

private int flag = 1;

/// <summary>

        /// 截圖

        /// </summary>

        private void toolStripButton3_Click(object sender, EventArgs e)

        {

            flag = 0;

            videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);

        }

        private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)

        {

            Bitmap bitmap = (Bitmap)eventArgs.Frame.Clone();

            if (flag == 0)

            {

                string img = dirc + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";

                bitmap.Save(img);

                flag = 1;

            }

        }
</pre> 完整的程序代碼如下：
using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Drawing.Imaging;

using System.Text;

using System.Windows.Forms;

using System.IO;

using AForge;

using AForge.Video;

using AForge.Video.DirectShow;

using AForge.Imaging;

using AForge.Imaging.Filters;

namespace Camera

{

    public partial class Form1 : Form

    {

        private FilterInfoCollection videoDevices;

        private VideoCaptureDevice videoSource;

        private int flag = 1;

        private string dirc = System.AppDomain.CurrentDomain.BaseDirectory + "Images"; //截圖保存的目錄

    public Form1()  
    {  
        InitializeComponent();  
    }  

    private void Form1_Load(object sender, EventArgs e)  
    {  
        if (!Directory.Exists(dirc))  
            Directory.CreateDirectory(dirc);  

        try  
        {  
            // 枚舉所有視頻輸入設備  
            videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);  
            if (videoDevices.Count == 0)  
                throw new ApplicationException();  

            foreach (FilterInfo device in videoDevices)  
            {  
                tscbxCameras.Items.Add(device.Name);  
            }  

            tscbxCameras.SelectedIndex = 0;  
        }  
        catch (ApplicationException)  
        {  
            tscbxCameras.Items.Add("No local capture devices");  
            videoDevices = null;  
        }  
    }  

    private void toolStripButton1_Click(object sender, EventArgs e)  
    {  
        CameraConn();  
    }  

    /// <summary>  
    /// 連接開啟攝像頭  
    /// </summary>  
    private void CameraConn()  
    {  
        videoSource = new VideoCaptureDevice(videoDevices[tscbxCameras.SelectedIndex].MonikerString);  
        videoSource.DesiredFrameSize = new Size(500, 300);  
        videoSource.DesiredFrameRate = 1;  
        videPlayer.VideoSource = videoSource;  
        videPlayer.Start();  
    }  
    /// <summary>  
    /// 關閉攝像頭  
    /// </summary>  
    private void toolStripButton2_Click(object sender, EventArgs e)  
    {  
        videPlayer.SignalToStop();  
        videPlayer.WaitForStop();  
    }  

    private void Form1_FormClosing(object sender, FormClosingEventArgs e)  
    {  
        toolStripButton2_Click(null, null);  
    }  
    /// <summary>  
    /// 截圖  
    /// </summary>  
    private void toolStripButton3_Click(object sender, EventArgs e)  
    {  
        flag = 0;  
        videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);  
    }        
    private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)  
    {  
        Bitmap bitmap = (Bitmap)eventArgs.Frame.Clone();  
        if (flag == 0)  
        {  
            string img = dirc + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";  
            bitmap.Save(img);  
            flag = 1;      
        }  
    }         
}  

}

</pre>