winform实例(3)-利用摄像头进行拍照

前言：

由于先前用python+opencv做了一会儿人脸识别。（其实是别人做的，我是打酱油的）。

用winform做了当时用的一个功能界面。打开摄像头并进行拍照保存。

界面预览：

此次，利用的是winform+AForge框架。AForge是全过程都在用的，必须要有。

介绍一下制作过程：

1.创建项目-->引用下载的AForge，是.dll文件类型。

2.开始实现功能

1）显示视频输入设备：

private void Form1_Load(object sender, EventArgs e)
        {
            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;
            }
        }

2）打开摄像头：

先对对象进行实例化，代码：

        FilterInfoCollection videoDevices;
        VideoCaptureDevice videoSource;
        public int selectedDeviceIndex = 0;

然后功能：

        //打开摄像头
        private void button1_Click_1(object sender, EventArgs e)
        {
            videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            selectedDeviceIndex = 0;
            videoSource = new VideoCaptureDevice(videoDevices[selectedDeviceIndex].MonikerString);//连接摄像头。
            videoSource.VideoResolution = videoSource.VideoCapabilities[selectedDeviceIndex];
            videoSourcePlayer1.VideoSource = videoSource;
            // set NewFrame event handler
            videoSourcePlayer1.Start();
        }

3）关闭功能：

有两个关闭方式：

一个点击关闭按钮：

//关闭摄像头
        private void button3_Click(object sender, EventArgs e)
        {
            videoSourcePlayer1.SignalToStop();
            videoSourcePlayer1.WaitForStop();
        }

一个关闭窗口时关闭

//关闭窗体时进行的事件
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            videoSourcePlayer1.SignalToStop();
            videoSourcePlayer1.WaitForStop();
        }

4）拍照

//拍照
        private void button2_Click(object sender, EventArgs e)
        {
            if (videoSource == null)
                return;
            Bitmap bitmap = videoSourcePlayer1.GetCurrentVideoFrame();
            string fileName = DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss-ff") + ".jpg";
            bitmap.Save(@"C:" + fileName, ImageFormat.Jpeg);
            bitmap.Dispose();
        }

其中，可以自定义保存路径和文件名称。 @是强制不转义的意思。

全部代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using AForge;
using AForge.Controls;
using AForge.Imaging;
using AForge.Video;
using AForge.Video.DirectShow;
using System.Drawing.Imaging;


namespace camera
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //初始化
        FilterInfoCollection videoDevices;
        VideoCaptureDevice videoSource;
        public int selectedDeviceIndex = 0;

        
        //打开摄像头
        private void button1_Click_1(object sender, EventArgs e)
        {
            videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            selectedDeviceIndex = 0;
            videoSource = new VideoCaptureDevice(videoDevices[selectedDeviceIndex].MonikerString);//连接摄像头。
            videoSource.VideoResolution = videoSource.VideoCapabilities[selectedDeviceIndex];
            videoSourcePlayer1.VideoSource = videoSource;
            // set NewFrame event handler
            videoSourcePlayer1.Start();
        }
        //拍照
        private void button2_Click(object sender, EventArgs e)
        {
            if (videoSource == null)
                return;
            Bitmap bitmap = videoSourcePlayer1.GetCurrentVideoFrame();
            string fileName = DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss-ff") + ".jpg";
            bitmap.Save(@"C:" + fileName, ImageFormat.Jpeg);
            bitmap.Dispose();
        }
        //关闭窗体时进行的事件
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            videoSourcePlayer1.SignalToStop();
            videoSourcePlayer1.WaitForStop();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            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;
            }
        }
        //关闭摄像头
        private void button3_Click(object sender, EventArgs e)
        {
            videoSourcePlayer1.SignalToStop();
            videoSourcePlayer1.WaitForStop();
        }

      
    }
}