我尝试使用Aforge编写一小段代码以捕获帧 我提到了Aforge.dll和AForge.Video.DirectShow.dll 代码如下,但我做错了。 警告我得到“名称videoDevices在当前上下文中不存在。 我认为它有关于我尝试创建该变量的位置,但我不确定在哪里放置按钮的代码以使其初始化。 该错误在visual studio中也显示为对象“videoDevices”
下的红线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;
using AForge.Video.DirectShow;
namespace AforgeCam
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
if (videoDevices.Count == 0)
throw new ApplicationException();
foreach (FilterInfo device in videoDevices)
{
VideoCaptureDevice videoSource = new VideoCaptureDevice(device.MonikerString);
videoSource.DesiredFrameSize = new Size(320, 240);
videoSource.DesiredFrameRate = 15;
videoSourcePlayer1.VideoSource = videoSource;
videoSourcePlayer1.Start();
}
}
}
}
答案 0 :(得分:7)
根据要求,解决方案如下,代码有效,我将针对另一个问题提出一个新问题。代码需要一个下拉框,2个按钮和一个图片框
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using AforgeCam;
using AForge.Video;
using AForge.Video.DirectShow;
namespace AforgeCam
{
public partial class Form1 : Form
{
private FilterInfoCollection VideoCaptureDevices;
private VideoCaptureDevice FinalVideo;
public Form1() // init
{
InitializeComponent();
{
VideoCaptureDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
foreach (FilterInfo VideoCaptureDevice in VideoCaptureDevices)
{
comboBox1.Items.Add(VideoCaptureDevice.Name);
}
comboBox1.SelectedIndex = 0;
}
}
private void button1_Click(object sender, EventArgs e)
{
FinalVideo = new VideoCaptureDevice(VideoCaptureDevices[comboBox1.SelectedIndex].MonikerString);
FinalVideo.NewFrame += new NewFrameEventHandler(FinalVideo_NewFrame);
FinalVideo.Start();
}
void FinalVideo_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
Bitmap video = (Bitmap)eventArgs.Frame.Clone();
pictureBox1.Image = video;
}
private void button2_Click(object sender, EventArgs e)
{
FinalVideo.Stop();
}
}