请大家帮我看看这个程序

我是一菜鸟级人物
现在毕业设计快要结束老师要我用c#做一个视频传输的程序
我搞到了这么一段代码
但不知道摄像头的数据从何读出
麻烦各位帮我看看,用哪个函数,或者还要新编函数,谢谢!using System;
using System.Runtime.InteropServices;namespace webcam
{
/// 
/// avicap 的摘要说明。
/// 
public class showVideo
{
// showVideo calls
[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 );
 
// Constants
public const int WM_USER = 0x400;
public const int WS_CHILD = 0x40000000;
public const int WS_VISIBLE = 0x10000000;
public const int SWP_NOMOVE = 0x2;
public const int SWP_NOZORDER = 0x4;
public const int WM_CAP_DRIVER_CONNECT = WM_USER + 10;
public const int WM_CAP_DRIVER_DISCONNECT = WM_USER + 11;
public const int WM_CAP_SET_CALLBACK_FRAME = WM_USER + 5;
public const int WM_CAP_SET_PREVIEW = WM_USER + 50;
public const int WM_CAP_SET_PREVIEWRATE = WM_USER + 52;
public const int WM_CAP_SET_VIDEOFORMAT = WM_USER + 45;
     
// Structures
[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 methods
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); 
}
} //Web Camera Class
public class WebCamera
{
// Constructur
public WebCamera(IntPtr handle, int width,int height)
{
mControlPtr = handle;
mWidth = width;
mHeight = height;
}
     
// delegate for frame callback
public delegate void RecievedFrameEventHandler(byte[] data);
public event RecievedFrameEventHandler RecievedFrame;
     
private IntPtr lwndC; // Holds the unmanaged handle of the control
private IntPtr mControlPtr; // Holds the managed pointer of the control
private int mWidth;
private int mHeight;
     
private showVideo.FrameEventHandler mFrameEventHandler; // Delegate instance for the frame callback - must keep alive! gc should NOT collect it
     
// Close the web camera
public void CloseWebcam()
{
this.capDriverDisconnect(this.lwndC);
}
     
// start the web camera
public void StartWebCam()
{
byte[] lpszName = new byte[100];
byte[] lpszVer = new byte[100];
          
showVideo.capGetDriverDescriptionA(0, lpszName, 100,lpszVer, 100);
//The capGetDriverDescription function retrieves the version description of the capture driver
this.lwndC = showVideo.capCreateCaptureWindowA(lpszName, showVideo.WS_VISIBLE + showVideo.WS_CHILD, 0, 0, mWidth, mHeight, mControlPtr, 0);
//The capCreateCaptureWindow function creates a capture window
          
if (this.capDriverConnect(this.lwndC, 0))
{
this.capPreviewRate(this.lwndC,60);
this.capPreview(this.lwndC, true);
showVideo.BITMAPINFO bitmapinfo = new showVideo.BITMAPINFO(); 
bitmapinfo.bmiHeader.biSize = showVideo.SizeOf(bitmapinfo.bmiHeader);
bitmapinfo.bmiHeader.biWidth = 320;
bitmapinfo.bmiHeader.biHeight = 240;
bitmapinfo.bmiHeader.biPlanes = 1;
bitmapinfo.bmiHeader.biBitCount =30;
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);
} 
}
 
// private functions
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)
{
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);
}
}}