aforge netc# 利用AForge.NET组件操作摄像头，报错：未引用实例

c# 利用AForge.NET组件操作摄像头，报错：未引用实例

//看了下你的代码，错误的原因就是连接的时候重新定义了一个对象。稍改下就好。using?System; using?System.Collections.Generic; using?System.ComponentModel; using?System.Data; using?System.Drawing; using?System.Drawing.Imaging; using?System.Text; using?System.Windows.Forms; using?System.Threading; using?e; using?e.Video; using?e.Video.DirectShow; using?e.Imaging; using?e.Imaging.Filters; using?System.IO; namespace?Camera { ????public?partial?class?Form1?:?Form ????{ ????????private?FilterInfoCollection?videoDevices; ????????public?VideoCaptureDevice?videoSource;?? ????????private?int?flag?=?1; ????????private?string?dirc?=?System.AppDomain.CurrentDomain.BaseDirectory?+?"JPG";?//截图保存的目录?? ????????public?Form1() ????????{ ????????????InitializeComponent(); ????????} ????????private?void?Form1_Load(object?sender,?EventArgs?e) ????????{ ????????????if?(!Directory.Exists(dirc)) ????????????????Directory.CreateDirectory(dirc);?? ????????????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; ????????????} ????????} ????????private?void?toolStripButton1_Click(object?sender,?EventArgs?e) ????????{ ????????????CameraConn(); ????????} ????????private?void?CameraConn() ????????{???//你这里重新定义了一个对象，所以出错 ????????????videoSource?=?new?VideoCaptureDevice(videoDevices[tscbxCameras.SelectedIndex].MonikerString); ????????????videoSource.DesiredFrameSize?=?new?Size(320,?240); ????????????videoSource.DesiredFrameRate?=?1; ????????????videPlayer.VideoSource?=?videoSource; ????????????videPlayer.Start(); ????????} ????????private?void?toolStripButton2_Click(object?sender,?EventArgs?e) ????????{ ????????????(); ????????????(); ????????} ????????private?void?Form1_FormClosing(object?sender,?FormClosingEventArgs?e) ????????{ ????????????toolStripButton2_Click(null,?null); ????????} ????????private?void?toolStripButton3_Click(object?sender,?EventArgs?e) ????????{ ????????????//不懂截图,但还是给你简单完善了下 ????????????flag?=?0; ????????????if?(videoSource?==?null) ????????????{ ????????????????MessageBox.Show("请先连接摄像头");???????????????? ????????????} ????????????else?if?(!videoSource.IsRunning) ????????????{ ????????????????MessageBox.Show("摄像头已经关闭，请重新打开"); ????????????} ????????????else ????????????{ ????????????????videoSource.NewFrame?+=?new?NewFrameEventHandler(video_NewFrame); ????????????} ????????} ????????private?void?video_NewFrame(object?sender,?NewFrameEventArgs?eventArgs) ????????{ ????????????Bitmap?bitmap?=?(Bitmap)eventArgs.Frame.Clone(); ????????????if?(flag?==?0) ????????????{ ????????????????string?img?=?dirc?+?"/"?+?DateTime.Now.ToString("yyyyMMddhhmmss")?+?".jpg"; ????????????????bitmap.Save(img); ????????????????flag?=?1; ????????????} ????????}? ????} }