C＃，每5秒钟连续保存来自摄像头的帧

2024-05-09 • 问答

当运行基于GUI的代码时，它实际上打开了一个网络摄像头提要并每5s保存一次帧，在随机运行时间（可能是5分钟或20分钟）之后，发生了一个异常，另一个过程''可能与保存当前帧有关。有什么想法会引起问题，应该进行哪些代码修改？

public partial class Form1 : Form
    {
        private FilterInfoCollection CaptureDevices;
        private VideoCaptureDevice videoSource;
        bool blncapturing;

        public Form1()
        {
            InitializeComponent();
            timer1.Enabled = false;
            timer1.Interval = 5000;
            blncapturing = false;
        }



        private void button1_Click(object sender,EventArgs e)
        {
            videoSource = new VideoCaptureDevice(CaptureDevices[comboBox1.SelectedIndex].monikerString);
            videoSource.NewFrame += new NewFrameEventHandler(VideoSource_NewFrame);
            videoSource.Start();
            timer1.Enabled = true;
        }


        private void VideoSource_NewFrame(object sender,NewFrameEventArgs eventArgs)
        {
            if (pictureBox1.Image != null)
                ((IDisposable)pictureBox1.Image).Dispose();


            pictureBox1.Image = (Bitmap)eventArgs.Frame.Clone();
        }

        private void Form1_Load_1(object sender,EventArgs e)
        {

            CaptureDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            foreach (FilterInfo Device in CaptureDevices)
            {
                comboBox1.Items.Add(Device.Name);
            }
            comboBox1.SelectedIndex = 0;
            videoSource = new VideoCaptureDevice();
        }

        private void button2_Click(object sender,EventArgs e)
        {
            videoSource.Stop();
            pictureBox1.Image = null;
            pictureBox1.Invalidate();
            pictureBox2.Image = null;
            pictureBox2.Invalidate();

        }

        private void button3_Click(object sender,EventArgs e)
        {
            Capturing();
        }

        private void button4_Click(object sender,EventArgs e)
        {
            if (videoSource.IsRunning == true)
            {
                videoSource.Stop();
            }
            Application.Exit(null);
        }

        private void timer1_Tick(object sender,EventArgs e)
        {
            timer1.Stop();
            Capturing();
            timer1.Start();
        }

        private void Capturing()
        {
            try
            {
                if (blncapturing == false)
                {
                    blncapturing = true;

                    pictureBox2.Image = (Bitmap)pictureBox1.Image.Clone();

                    string strGrabFileName = String.Format("C:\\Users\\echristo\\Desktop\\trial\\snapshot_{0:yyyyMMdd_hhmmss.fff}.bmp",DateTime.Now);
                    pictureBox2.Image.Save(strGrabFileName,System.Drawing.Imaging.ImageFormat.Jpeg) ;
                    blncapturing = false;

                }
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message);                
            }


        }

private readonly object myLock = new object(); private void VideoSource_NewFrame(object sender,NewFrameEventArgs eventArgs) { lock (myLock) { this.Invoke((Action)(() => { if (pictureBox1.Image != null) ((IDisposable)pictureBox1.Image).Dispose(); pictureBox1.Image = (Bitmap)eventArgs.Frame.Clone(); })); } } private void timer1_Tick(object sender,EventArgs e) { timer1.Stop(); // you can try with timer1 inside the lock lock (myLock) { // you don't need invoke here,because the winforms timer runs on the main thread. Capturing(); } timer1.Start(); }

C＃，每5秒钟连续保存来自摄像头的帧

hhhhttty 回答：C＃，每5秒钟连续保存来自摄像头的帧

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