用c#调用摄像头做录像功能

       前段时间刚做了个监控系统，有不明白+qq

       using System.Runtime.InteropServices;

       using System.Drawing;

       using System.Drawing.Imaging;

       using System;

       namespace CamTest2

       {

        /// <summary>

        /// 一个控制摄像头的lakkalinux源码编译类

        /// </summary>

        public class Pick

        {

        private const int WM_USER = 0x;

        private const int WS_CHILD = 0x;

        private const int WS_VISIBLE = 0x;

        private const int WM_CAP_START = WM_USER;

        private const int WM_CAP_STOP = WM_CAP_START + ;

        private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + ;

        private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + ;

        private const int WM_CAP_SAVEDIB = WM_CAP_START + ;

        private const int WM_CAP_GRAB_FRAME = WM_CAP_START + ;

        private const int WM_CAP_SEQUENCE = WM_CAP_START + ;

        private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + ;

        private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + ;

        private const int WM_CAP_SET_OVERLAY = WM_CAP_START + ;

        private const int WM_CAP_SET_PREVIEW = WM_CAP_START + ;

        private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;

        private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;

        private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;

        private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;

        private const int WM_CAP_SET_SCALE = WM_CAP_START + ;

        private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + ;

        private const int WM_CAP_DLG_VIDEOFORMAT = WM_CAP_START + ;

        private const int WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + ;

        private const int WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + ;

        private const int WM_CAP_DLG_VIDEOCOMPRESSION = WM_CAP_START + ;

        private IntPtr hWndC;

        private bool bStat = false;

        private IntPtr mControlPtr;

        private int mWidth;

        private int mHeight;

        private int mLeft;

        private int mTop;

        /// <summary>

        /// 初始化摄像头

        /// </summary>

        /// <param name="handle">控件的句柄</param>

        /// <param name="left">开始显示的左边距</param>

        /// <param name="top">开始显示的上边距</param>

        /// <param name="width">要显示的宽度</param>

        /// <param name="height">要显示的长度</param>

        public Pick(IntPtr handle, int left, int top, int width, int height)

        {

        mControlPtr = handle;

        mWidth = width;

        mHeight = height;

        mLeft = left;

        mTop = top;

        }

        [DllImport("avicap.dll")]

        private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);

        [DllImport("avicap.dll")]

        private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);

        [DllImport("User.dll")]

        private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam);

       public void capDlgVideoFormat()

        {

        Boolean capDlgVideoFormat = SendMessage(hWndC, WM_CAP_DLG_VIDEOFORMAT, 0, 0);

        }

        public void capDlgVideoSource()

        {

        Boolean capDlgVideoSource = SendMessage(hWndC, WM_CAP_DLG_VIDEOSOURCE, 0, 0);

        }

        public void capDlgVideoDisplay()

        {

        Boolean capDlgVideoDisplay = SendMessage(hWndC, WM_CAP_DLG_VIDEODISPLAY, 0, 0);

        }

        public void capDlgVideoCompression()

        {

        Boolean capDlgVideoCompression = SendMessage(hWndC, WM_CAP_DLG_VIDEOCOMPRESSION, 0, 0);

        }

        /// <summary>

        /// 开始显示图像

        /// </summary>

        public void Start()

        {

        if (bStat)

        return;

        bStat = true;

        byte[] lpszName = new byte[];

        hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);

        if (hWndC.ToInt() != 0)

        {

        SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);

        SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);

        SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);

        SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);

        SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);

        SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, , 0);

        SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);

        SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);

        }

        return;

        }

        /// <summary>

        /// 停止显示

        /// </summary>

        public void Stop()

        {

        SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);

        bStat = false;

        }

        /// <summary>

        /// 抓图

        /// </summary>

        /// <param name="path">要保存bmp文件的路径</param>

        public void GrabImage(string path)

        {

        IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);

        SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt());

       }

        /// <summary>

        /// 录像

        /// </summary>

        /// <param name="path">要保存avi文件的路径</param>

        public void Kinescope(string path)

        {

        IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);

       SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt());

       SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);

        }

       /// <summary>

        /// 停止录像

        /// </summary>

        public void StopKinescope()

        {

        SendMessage(hWndC, WM_CAP_STOP, 0, 0);

        }

        /* public void cap()

        {

        CAPTUREPARMS s;

        capCaptureGetSetup(m_caphwnd,&s,sizeof(CAPTUREPARMS));//取得采集参数

        s.dwRequestMicroSecPerFrame = ;//采集一帧花费1/秒

        s.fAbortLeftMouse = FALSE;//压下鼠标左键不终止采集

        s.fAbortRightMouse = FALSE;//压下鼠标右键不终止采集

        s.fCaptureAudio = TRUE;//c采集音频

        s.fYield = TRUE;//使用一个独立的线程来采集视频，不使用View窗口线程

        capCaptureSetSetup(m_caphwnd,suplay平台源码&s,sizeof(CAPTUREPARMS));//设定采集参数

       }*/

        }

       }