使用Aforge.net對螢幕進行截圖，並將每一張BITMAP寫到AVI檔案中。超級簡單！

AFORGE.NET的ScreenCaptureStream效能有限，目前測試基本能達到10幀左右。

設定AVIWriter的FrameRate為8幀，但是播放起來像快進一樣，目前還沒有找到原因。暫時採取一個New Frame到達時，多寫幾次的方法進行規避。

有知道如何處理的請聯絡我。

詳細程式碼如下：

  public partial class Form1 : Form
    {
        Screen c = Screen.PrimaryScreen;

        AVIWriter write;
        /// <summary>
        /// 截圖例項
        /// </summary>
        ScreenCaptureStream cap;
        Pen p = new Pen(Brushes.Red, 5);
        Pen p2 = new Pen(Brushes.Green, 5);
        bool isStart = false;

        public Form1()
        {
            InitializeComponent();
      
         }
        void cap_NewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            Debug.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff"));
            int x = Control.MousePosition.X;
            int y = Control.MousePosition.Y;
            using (Graphics g = Graphics.FromImage(eventArgs.Frame))
            {
                //畫時間
                g.DrawString(DateTime.Now.ToString(), new Font("宋體", 14f, FontStyle.Bold), Brushes.Red, new PointF(100, 100));
                //畫滑鼠位置
                g.DrawEllipse(p, new Rectangle(x - 10, y - 10, 20, 20));
            }
            if (Control.MouseButtons == MouseButtons.Left)
            {
                //滑鼠左鍵點選時，繪製點選影象
                Bitmap bt_re = (Bitmap)eventArgs.Frame.Clone();
                using (Graphics g = Graphics.FromImage(bt_re))
                {
                    g.SmoothingMode = SmoothingMode.HighSpeed;
                    g.DrawEllipse(p2, new Rectangle(x - 20, y - 20, 40, 40));
                }
                write.AddFrame(eventArgs.Frame);
                write.AddFrame(bt_re);
                write.AddFrame(bt_re);
                write.AddFrame(eventArgs.Frame);
            }
            else
            {
                write.AddFrame(eventArgs.Frame);
            }
            //多寫一次，如果不多寫，感覺播放像在快進。前面設定了幀速率也沒什麼用。有知道的高手請回答。
            write.AddFrame(eventArgs.Frame);
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            button2.Enabled = false;
            p.StartCap = LineCap.Round;
            p.EndCap = LineCap.Round;
            p2.StartCap = LineCap.Round;
            p2.EndCap = LineCap.Round;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            isStart = true;
            cap = new ScreenCaptureStream(c.Bounds,125);
            cap.NewFrame += new NewFrameEventHandler(cap_NewFrame);
            string filename=DateTime.Now.ToString()+"avi";
            SaveFileDialog sf = new SaveFileDialog();
            sf.Filter = "視訊檔案|*.avi";
            if (sf.ShowDialog() == DialogResult.OK)
            {
                filename = sf.FileName;
                write = new AVIWriter();
                write.Open(filename, c.Bounds.Width, c.Bounds.Height);
                write.FrameRate = 8;
                cap.Start();
            }
            button1.Enabled = false;
            button2.Enabled = true;
        }

      


        private void button2_Click(object sender, EventArgs e)
        {
            //多等1s記錄畫面
            Thread.Sleep(1000);
            cap.Stop();
            write.Close();
            write.Dispose();
            button1.Enabled = true;
            button2.Enabled = false;
        }
    }