winform實例(3)-利用攝像頭進行拍照

前言：

由於先前用python+opencv做了一會兒人臉識別。（其實是別人做的，我是打醬油的）。

用winform做了當時用的一個功能界面。打開攝像頭併進行拍照保存。

界面預覽：

此次，利用的是winform+AForge框架。AForge是全過程都在用的，必須要有。

介紹一下製作過程：

1.創建項目-->引用下載的AForge，是.dll文件類型。

2.開始實現功能

1）顯示視頻輸入設備：

 1 private void Form1_Load(object sender, EventArgs e)
 2         {
 3             try
 4             {
 5                 // 枚舉所有視頻輸入設備
 6                 videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
 7 
 8                 if (videoDevices.Count == 0)
 9                     throw new ApplicationException();
10 
11                 foreach (FilterInfo device in videoDevices)
12                 {
13                     tscbxCameras.Items.Add(device.Name);
14                 }
15 
16                 tscbxCameras.SelectedIndex = 0;
17 
18             }
19             catch (ApplicationException)
20             {
21                 tscbxCameras.Items.Add("No local capture devices");
22                 videoDevices = null;
23             }
24         }

2）打開攝像頭：

先對對象進行實例化，代碼：

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

然後功能：

 1         //打開攝像頭
 2         private void button1_Click_1(object sender, EventArgs e)
 3         {
 4             videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
 5             selectedDeviceIndex = 0;
 6             videoSource = new VideoCaptureDevice(videoDevices[selectedDeviceIndex].MonikerString);//連接攝像頭。
 7             videoSource.VideoResolution = videoSource.VideoCapabilities[selectedDeviceIndex];
 8             videoSourcePlayer1.VideoSource = videoSource;
 9             // set NewFrame event handler
10             videoSourcePlayer1.Start();
11         }

3）關閉功能：

有兩個關閉方式：

一個點擊關閉按鈕：

1 //關閉攝像頭
2         private void button3_Click(object sender, EventArgs e)
3         {
4             videoSourcePlayer1.SignalToStop();
5             videoSourcePlayer1.WaitForStop();
6         }

一個關閉視窗時關閉

1 //關閉窗體時進行的事件
2         private void Form1_FormClosing(object sender, FormClosingEventArgs e)
3         {
4             videoSourcePlayer1.SignalToStop();
5             videoSourcePlayer1.WaitForStop();
6         }

4）拍照

 1 //拍照
 2         private void button2_Click(object sender, EventArgs e)
 3         {
 4             if (videoSource == null)
 5                 return;
 6             Bitmap bitmap = videoSourcePlayer1.GetCurrentVideoFrame();
 7             string fileName = DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss-ff") + ".jpg";
 8             bitmap.Save(@"C:\" + fileName, ImageFormat.Jpeg);
 9             bitmap.Dispose();
10         }

其中，可以自定義保存路徑和文件名稱。 @是強制不轉義的意思。

全部代碼：

 1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Threading.Tasks;
 9 using System.Windows.Forms;
10 using AForge;
11 using AForge.Controls;
12 using AForge.Imaging;
13 using AForge.Video;
14 using AForge.Video.DirectShow;
15 using System.Drawing.Imaging;
16 
17 
18 namespace camera
19 {
20     public partial class Form1 : Form
21     {
22         public Form1()
23         {
24             InitializeComponent();
25         }
26         //初始化
27         FilterInfoCollection videoDevices;
28         VideoCaptureDevice videoSource;
29         public int selectedDeviceIndex = 0;
30 
31         
32         //打開攝像頭
33         private void button1_Click_1(object sender, EventArgs e)
34         {
35             videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
36             selectedDeviceIndex = 0;
37             videoSource = new VideoCaptureDevice(videoDevices[selectedDeviceIndex].MonikerString);//連接攝像頭。
38             videoSource.VideoResolution = videoSource.VideoCapabilities[selectedDeviceIndex];
39             videoSourcePlayer1.VideoSource = videoSource;
40             // set NewFrame event handler
41             videoSourcePlayer1.Start();
42         }
43         //拍照
44         private void button2_Click(object sender, EventArgs e)
45         {
46             if (videoSource == null)
47                 return;
48             Bitmap bitmap = videoSourcePlayer1.GetCurrentVideoFrame();
49             string fileName = DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss-ff") + ".jpg";
50             bitmap.Save(@"C:\" + fileName, ImageFormat.Jpeg);
51             bitmap.Dispose();
52         }
53         //關閉窗體時進行的事件
54         private void Form1_FormClosing(object sender, FormClosingEventArgs e)
55         {
56             videoSourcePlayer1.SignalToStop();
57             videoSourcePlayer1.WaitForStop();
58         }
59 
60         private void Form1_Load(object sender, EventArgs e)
61         {
62             try
63             {
64                 // 枚舉所有視頻輸入設備
65                 videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
66 
67                 if (videoDevices.Count == 0)
68                     throw new ApplicationException();
69 
70                 foreach (FilterInfo device in videoDevices)
71                 {
72                     tscbxCameras.Items.Add(device.Name);
73                 }
74 
75                 tscbxCameras.SelectedIndex = 0;
76 
77             }
78             catch (ApplicationException)
79             {
80                 tscbxCameras.Items.Add("No local capture devices");
81                 videoDevices = null;
82             }
83         }
84         //關閉攝像頭
85         private void button3_Click(object sender, EventArgs e)
86         {
87             videoSourcePlayer1.SignalToStop();
88             videoSourcePlayer1.WaitForStop();
89         }
90 
91       
92     }
93 }