c#利用AForge.NET组件操作摄像头

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AForge.NET是一个专门为开发者和研究者基于C#框架设计的，这个框架提供了不同的类库和关于类库的资源，还有很多应用程序例子，包括计算机视觉与人工智能，图像处理，神经网络，遗传算法，机器学习，机器人等领域。

根据网上的方法，运行程序摄像头出来了，但是怎么截图呢？找到一个显示图片方法如下

[csharp] view plain copy print ?

private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
Bitmap img = (Bitmap)eventArgs.Frame.Clone();
//do processing here
pictureBox1.Image = img;
}

开始参考这句代码写了：

[csharp] view plain copy print ?

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);
}

但是点击截图程序就自动不停截了大量的图片，最后导致程序出问题。想了一个笨方法，可以只截一次图：

[csharp] view plain copy print ?

private int flag = 1;
/// <summary>
/// 截图
/// </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;
}
}

完整的程序代码如下：

[csharp] view plain copy print ?

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"; //截图保存的目录
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
if (!Directory.Exists(dirc))
Directory.CreateDirectory(dirc);
try
{
// 枚举所有视频输入设备
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>
/// 连接开启摄像头
/// </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>
/// 关闭摄像头
/// </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>
/// 截图
/// </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;
}
}
}
}