一、 新建一个Winform项目
二、使用Nuget添加引用
安装下图中红色框住的两个程序包
安装完后发现安装了如下图的程序包，这是因为上述两个程序包存在对其它程序包的依赖。
三、编写程序
1. 窗体设计，摄像头是下拉列表（cmbCamera，控件命名，下同），虽然示例只用到一个摄像头，但是该Demo可用于多个摄像头间切换场景，分辨率是下拉列表（cmbResolution），列出摄像头所支持的分辨率，一个VideoSourcePlayer控件（vispShoot），一个PictureBox控件（picbPreview）。
2. 编写代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using AForge.Video.DirectShow;
namespace AforgeDemo
{
public partial class Form1 : Form
{
private FilterInfoCollection videoDevices;
private VideoCaptureDevice videoDevice;
private VideoCapabilities[] videoCapabilities;
private VideoCapabilities[] snapshotCapabilities;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
if (videoDevices.Count != 0)
{
foreach (FilterInfo device in videoDevices)
{
cmbCamera.Items.Add(device.Name);
}
}
else
{
cmbCamera.Items.Add("没有找到摄像头");
}
cmbCamera.SelectedIndex = 0;
}
private void cmbCamera_SelectedIndexChanged(object sender, EventArgs e)
{
if (videoDevices.Count != 0)
{
videoDevice = new VideoCaptureDevice(videoDevices[cmbCamera.SelectedIndex].MonikerString);
GetDeviceResolution(videoDevice);
}
}
private void GetDeviceResolution(VideoCaptureDevice videoCaptureDevice)
{
cmbResolution.Items.Clear();
videoCapabilities = videoCaptureDevice.VideoCapabilities;
foreach (VideoCapabilities capabilty in videoCapabilities)
{
cmbResolution.Items.Add($"{capabilty.FrameSize.Width} x {capabilty.FrameSize.Height}");
}
cmbResolution.SelectedIndex = 0;
}
private void btnConnect_Click(object sender, EventArgs e)
{
if (videoDevice != null)
{
if ((videoCapabilities != null) && (videoCapabilities.Length != 0))
{
videoDevice.VideoResolution = videoCapabilities[cmbResolution.SelectedIndex];
vispShoot.VideoSource = videoDevice;
vispShoot.Start();
EnableControlStatus(false);
}
}
}
private void EnableControlStatus(bool status)
{
cmbCamera.Enabled = status;
cmbResolution.Enabled = status;
btnConnect.Enabled = status;
btnShoot.Enabled = !status;
btnDisconnect.Enabled = !status;
}
private void btnDisconnect_Click(object sender, EventArgs e)
{
DisConnect();
EnableControlStatus(true);
}
private void DisConnect()
{
if (vispShoot.VideoSource != null)
{
vispShoot.SignalToStop();
vispShoot.WaitForStop();
vispShoot.VideoSource = null;
}
}
private void btnShoot_Click(object sender, EventArgs e)
{
Bitmap img = vispShoot.GetCurrentVideoFrame();
picbPreview.Image = img;
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
DisConnect();
}
}
}
3. 测试
附上窗体设计代码：
namespace AforgeDemo
{
partial class Form1
{
///