当前上下文中不存在名称“video

[f2831890]

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 System.IO;

namespace _718单个摄像头
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
btnPlay.Enabled = false;
btnStop.Enabled = true;
btnPz.Enabled = true;
video = new cVideo(pictureBox1.Handle, pictureBox1.Width, pictureBox1.Height);
video.StartWebCam();
}
//在【关闭视频】按钮的Click事件中添加如下代码：
private void b_stop_Click(object sender, EventArgs e)
{
btnPlay.Enabled = true;
btnStop.Enabled = false;
btnPz.Enabled = false;
video.CloseWebcam();
}
//在【拍摄照片】按钮的Click事件下添加如下代码：
private void btnPz_Click(object sender, EventArgs e)
{
video.GrabImage(pictureBox1.Handle, "d:\\a.bmp");
}
}
}

[老毕]

可能在整个程序范围内，定义有一个cVideo的实例对象video。

你在IDE里，在你红字的这几个video上点鼠标右链，转到定义，就能找到它在哪里声明的了。

[ohkuy]

//在最外面定义，并且保证要先按button1，否则会说“未将对象引用到实例”
cVideo video; 
private void button1_Click(object sender, EventArgs e)
  {
  btnPlay.Enabled = false;
  btnStop.Enabled = true;
  btnPz.Enabled = true;
  video = new cVideo(pictureBox1.Handle, pictureBox1.Width, pictureBox1.Height);
  video.StartWebCam();
  }

[TimZhuFaith]

cVideo video = null;
public Form1()
{
InitializeComponent();
}