namespace EXT13_08
{
    public partial class Form1 : Form
    {
        cVideo video = null;

        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 打开视频
        /// </summary>
        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();
        }

        /// <summary>
        /// 关闭视频
        /// </summary>
        private void btnStop_Click(object sender, EventArgs e)
        {
            btnPlay.Enabled = true;
            btnStop.Enabled = false;
            btnPz.Enabled = false;
            video.CloseWebcam();
        }



        /// <summary>
        /// 拍照
        /// </summary>
        private void bntPz_Click(object sender, EventArgs e)
        {
            video.GrabImage(pictureBox1.Handle, "d:\\a.bmp");
        }

        /// <summary>
        /// 开始录像
        /// </summary>
        private void btnRecord_Click(object sender, EventArgs e)
        {
            btnStar.Enabled = false;
            btnStop.Enabled = true;
            video.StarKinescope(@"d:\lx.avi");
        }
    }

  public class cVideo     //视频类
    {
        private IntPtr lwndC;       //保存无符号句柄
        private IntPtr mControlPtr; //保存管理指示器
        private int mWidth;
        private int mHeight;

        private const int WM_USER = 0x400;
        private const int WM_CAP_START = WM_USER;
        private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
        private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
        private const int WM_CAP_STOP = WM_CAP_START + 68;

        private IntPtr hWndC;



        public cVideo(IntPtr handle, int width, int height)
        {
            mControlPtr = handle; //显示视频控件的句柄
            mWidth = width;      //视频宽度
            mHeight = height;    //视频高度
        }
        /// <summary>
        /// 打开视频设备
        /// </summary>
        public void StartWebCam()
        {
            byte[] lpszName = new byte[100];
            byte[] lpszVer = new byte[100];
            VideoAPI.capGetDriverDescriptionA(0, lpszName, 100, lpszVer, 100);
            this.lwndC = VideoAPI.capCreateCaptureWindowA(lpszName, VideoAPI.WS_CHILD | VideoAPI.WS_VISIBLE, 0, 0, mWidth, mHeight, mControlPtr, 0);
            if (VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0))
            {
                VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEWRATE, 100, 0);
                VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEW, true, 0);
            }
        }

        /// <summary>
        /// 关闭视频设备
        /// </summary>
        public void CloseWebcam()
        {
            VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_DISCONNECT, 0, 0);
        }


        ///   <summary>   
        ///   拍照
        ///   </summary>   
        ///   <param   name="path">要保存bmp文件的路径</param>   
        public void GrabImage(IntPtr hWndC, string path)
        {
            IntPtr hBmp = System.Runtime.InteropServices.Marshal.StringToHGlobalAnsi(path);
            VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
        }


        ///   <summary>   
        ///   开始录像
        ///   </summary>   
        ///   <param   name="path">要保存录像的路径</param>   
        public void StarKinescope(string path)
        {
            IntPtr hBmp = System.Runtime.InteropServices.Marshal.StringToHGlobalAnsi(path);
            VideoAPI.SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32());
            VideoAPI.SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
        }


        /// <summary>
        /// 停止录像
        /// </summary>
        public void StopKinescope()
        {
            VideoAPI.SendMessage(hWndC, WM_CAP_STOP, 0, 0);
        }

    }
还需要做其他事情吗？

d盘里没有文件。