摄像头抓取图片的程序

using System; 
using System.IO; 
using System.Drawing.Imaging; 
using System.Runtime.InteropServices; 
using System.Drawing; 
using System.Collections; 
using System.Data; 
 
namespace SoundVideo 
{  
  
     public class Camera 
    { 
        public delegate void RecievedFrameEventHandler(byte[] data); 
        public event RecievedFrameEventHandler RecievedFrame; 
 
        public IntPtr lwndC; 
        private IntPtr mControlPtr; 
        private int mWidth; 
        private int mHeight; 

        private showVideo.FrameEventHandler mFrameEventHandler;   
        public Camera(IntPtr handle, int width, int height) 
        { 
            mControlPtr = handle; 
            mWidth = width; 
            mHeight = height; 
        } 
 
        public void CloseCamera() 
        { 
            this.capDriverDisconnect(this.lwndC); 
        } 
 
        public void StartCamera(int width ,int height) 
        { 
            try 
            { 
                byte[] lpszName = new byte[100]; 
                byte[] lpszVer = new byte[100];
 
                showVideo.capGetDriverDescriptionA(0, lpszName, 100, lpszVer, 100); 
                this.lwndC = showVideo.capCreateCaptureWindowA(lpszName, showVideo.WS_VISIBLE + showVideo.WS_CHILD, 0, 0, mWidth, mHeight, mControlPtr, 0);
                if (this.capDriverConnect(this.lwndC, 0)) 
                { 
                    this.capPreviewRate(this.lwndC, 66); 
                    this.capPreview(this.lwndC, true); 
                    showVideo.BITMAPINFO bitmapinfo = new showVideo.BITMAPINFO(); 
                    bitmapinfo.bmiHeader.biSize = showVideo.SizeOf(bitmapinfo.bmiHeader);
                    bitmapinfo.bmiHeader.biWidth = width;//352; 
                    bitmapinfo.bmiHeader.biHeight = height;// 288; 
                    bitmapinfo.bmiHeader.biPlanes = 1; 
                    bitmapinfo.bmiHeader.biBitCount = 24; 
                    this.capSetVideoFormat(this.lwndC, ref bitmapinfo, showVideo.SizeOf(bitmapinfo)); 
                    this.mFrameEventHandler = new showVideo.FrameEventHandler(FrameCallBack); 
                    this.capSetCallbackOnFrame(this.lwndC, this.mFrameEventHandler); 
                    showVideo.SetWindowPos(this.lwndC, 0, 0, 0, mWidth, mHeight, 6); 
                } 
            } 
            catch 
            { 
                throw; 
            } 
        } 
 
        public void bitMapToJPG(string bmpFileName, string jpgFileName) 
        { 
            System.Drawing.Image img; 
            img = ReturnPhoto(bmpFileName); 
            img.Save(jpgFileName, ImageFormat.Jpeg); 
        } 
        private Image ReturnPhoto(string bmpFileName) 
        { 
            try 
            { 
                System.IO.FileStream stream; 
                stream = File.OpenRead(bmpFileName); 
                Bitmap bmp = new Bitmap(stream); 
                System.Drawing.Image image = bmp;//得到原图 
 
                //创建指定大小的图 
                System.Drawing.Image newImage = image.GetThumbnailImage(bmp.Width, bmp.Height, null, new IntPtr()); 
                Graphics g = Graphics.FromImage(newImage); 
                g.DrawImage(newImage, 0, 0, newImage.Width, newImage.Height); //将原图画到指定的图上 
                g.Dispose(); 
                stream.Close(); 
 
                return newImage; 
            } 
            catch 
            { 
                throw; 
            } 
        } 
        public void capImage(IntPtr lwnd, string path)//抓图 
        { 
            showVideo.BITMAPINFO bitmapinfo = new showVideo.BITMAPINFO(); 
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); 
            showVideo.SendMessage(lwnd, showVideo.WM_CAP_SAVEDIB, 0, hBmp.ToInt32()); 
 
        } 
        public void capScope(IntPtr lwnd, string path)// 录像,保存avi文件的路径 
        { 
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); 
            showVideo.SendMessage(lwnd, showVideo.WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32()); 
            showVideo.SendMessage(lwnd, showVideo.WM_CAP_SEQUENCE, 0, 0); 
        } 
        public void stopCapScope(IntPtr lwnd)// 停止录像 
        { 
            showVideo.SendMessage(lwnd, showVideo.WM_CAP_STOP, 0, 0); 
        } 
        private bool capDriverConnect(IntPtr lwnd, short i) 
        { 
            return showVideo.SendMessage(lwnd, showVideo.WM_CAP_DRIVER_CONNECT, i, 0); 
        } 
        private bool capDriverDisconnect(IntPtr lwnd) 
        { 
            return showVideo.SendMessage(lwnd, showVideo.WM_CAP_DRIVER_DISCONNECT, 0, 0); 
        } 
        private bool capPreview(IntPtr lwnd, bool f) 
        { 
            return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_PREVIEW, f, 0); 
        } 
 
        private bool capPreviewRate(IntPtr lwnd, short wMS) 
        { 
            return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_PREVIEWRATE, wMS, 0); 
        } 
 
        private bool capSetCallbackOnFrame(IntPtr lwnd, showVideo.FrameEventHandler lpProc) 
        { 
            return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_CALLBACK_FRAME, 0, lpProc); 
        } 
        private bool capSetVideoFormat(IntPtr hCapWnd, ref showVideo.BITMAPINFO BmpFormat, int CapFormatSize) 
        { 
            return showVideo.SendMessage(hCapWnd, showVideo.WM_CAP_SET_VIDEOFORMAT, CapFormatSize, ref BmpFormat); 
        } 
        private void FrameCallBack(IntPtr lwnd, IntPtr lpVHdr) 
        { 
            try 
            { 
                showVideo.VIDEOHDR videoHeader = new showVideo.VIDEOHDR(); 
                byte[] VideoData; 
                videoHeader = (showVideo.VIDEOHDR)showVideo.GetStructure(lpVHdr, videoHeader); 
                VideoData = new byte[videoHeader.dwBytesUsed]; 
                showVideo.Copy(videoHeader.lpData, VideoData); 
                if (this.RecievedFrame != null) this.RecievedFrame(VideoData); 
            } 
            catch 
            { 
                throw; 
            } 
        } 
 
    }

    public class showVideo
    {
        [DllImport("avicap32.dll")]
        public static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
        [DllImport("avicap32.dll")]
        public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer);
        [DllImport("User32.dll")]
        public static extern bool SendMessage(IntPtr hWnd, int wMsg, bool wParam, int lParam);
        [DllImport("User32.dll")]
        public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, int lParam);
        [DllImport("User32.dll")]
        public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, FrameEventHandler lParam);
        [DllImport("User32.dll")]
        public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, ref BITMAPINFO lParam);
        [DllImport("User32.dll")]
        public static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);
        [DllImport("avicap32.dll")]
        public static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);

        public const int WM_USER = 0x400;
        public const int WS_CHILD = 0x40000000;
        public const int WS_VISIBLE = 0x10000000;
        public const int WM_CAP_START = WM_USER;
        public const int WM_CAP_STOP = WM_CAP_START + 68;
        public const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
        public const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
        public const int WM_CAP_SAVEDIB = WM_CAP_START + 25;
        public const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
        public const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
        public const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
        public const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63;
        public const int WM_CAP_SET_OVERLAY = WM_CAP_START + 51;
        public const int WM_CAP_SET_PREVIEW = WM_CAP_START + 50;
        public const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;
        public const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;
        public const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;
        public const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;
        public const int WM_CAP_SET_SCALE = WM_CAP_START + 53;
        public const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52;
        public const int WM_CAP_SET_VIDEOFORMAT = WM_USER + 45;

        [StructLayout(LayoutKind.Sequential)]
        public struct VIDEOHDR
        {
            [MarshalAs(UnmanagedType.I4)]
            public int lpData;
            [MarshalAs(UnmanagedType.I4)]
            public int dwBufferLength;
            [MarshalAs(UnmanagedType.I4)]
            public int dwBytesUsed;
            [MarshalAs(UnmanagedType.I4)]
            public int dwTimeCaptured;
            [MarshalAs(UnmanagedType.I4)]
            public int dwUser;
            [MarshalAs(UnmanagedType.I4)]
            public int dwFlags;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
            public int[] dwReserved;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct BITMAPINFOHEADER
        {
            [MarshalAs(UnmanagedType.I4)]
            public Int32 biSize;
            [MarshalAs(UnmanagedType.I4)]
            public Int32 biWidth;
            [MarshalAs(UnmanagedType.I4)]
            public Int32 biHeight;
            [MarshalAs(UnmanagedType.I2)]
            public short biPlanes;
            [MarshalAs(UnmanagedType.I2)]
            public short biBitCount;
            [MarshalAs(UnmanagedType.I4)]
            public Int32 biCompression;
            [MarshalAs(UnmanagedType.I4)]
            public Int32 biSizeImage;
            [MarshalAs(UnmanagedType.I4)]
            public Int32 biXPelsPerMeter;
            [MarshalAs(UnmanagedType.I4)]
            public Int32 biYPelsPerMeter;
            [MarshalAs(UnmanagedType.I4)]
            public Int32 biClrUsed;
            [MarshalAs(UnmanagedType.I4)]
            public Int32 biClrImportant;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct BITMAPINFO
        {
            [MarshalAs(UnmanagedType.Struct, SizeConst = 40)]
            public BITMAPINFOHEADER bmiHeader;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1024)]
            public Int32[] bmiColors;
        }

        public delegate void FrameEventHandler(IntPtr lwnd, IntPtr lpVHdr);

        public static object GetStructure(IntPtr ptr, ValueType structure)
        {
            return Marshal.PtrToStructure(ptr, structure.GetType());
        }

        public static object GetStructure(int ptr, ValueType structure)
        {
            return GetStructure(new IntPtr(ptr), structure);
        }

        public static void Copy(IntPtr ptr, byte[] data)
        {
            Marshal.Copy(ptr, data, 0, data.Length);
        }

        public static void Copy(int ptr, byte[] data)
        {
            Copy(new IntPtr(ptr), data);
        }

        public static int SizeOf(object structure)
        {
            return Marshal.SizeOf(structure);
        }
    } 
}