C#捕捉视频头

using System;
 using System.Runtime.InteropServices;namespace Wuyin.ShoesManager
 {
     /// <summary>
     /// VedioCapture 的摘要说明。
     /// </summary>
     public class VedioCapture
     {
         private int hCaptureM;
         private bool isUnLoad = false;
         public VedioCapture()
         {        
         }
         [DllImport("avicap32.dll")]
         private static extern int capCreateCaptureWindow( string strWindowName, int dwStyle, int x, int y ,int width, int height , int hwdParent, int nID );
         [DllImport("user32.dll")]
         private static extern int SendMessage( int hwnd , int wMsg, int wParam , int lParam );
         [DllImport("user32.dll")]
         private static extern int SendMessage( int hwnd , int wMsg, int wParam , string lParam );
         [DllImport("Kernel32.dll")]
         private static extern bool CloseHandle( int hObject );
         public bool Initialize( System.Windows.Forms.Control aContainer , int intWidth, int intHeight )
         {
             hCaptureM = capCreateCaptureWindow( "", 0x40000000 | 0x10000000, 0,0,intWidth,intHeight,aContainer.Handle.ToInt32() ,1 );
             if( hCaptureM == 0 ) return false;
             
             int ret = SendMessage( hCaptureM , 1034, 0,0 );
             if( ret == 0 )
             {
                 CloseHandle(hCaptureM);
                 return false;
             }
             //WM_CAP_SET_PREVIEW
             ret = SendMessage( hCaptureM, 1074, 1, 0 );
             if( ret == 0 )
             {
                 this.UnLoad();
                 return false;
             }
             //WM_CAP_SET_SCALE
             ret = SendMessage( hCaptureM, 1077, 1, 0 );
             if( ret == 0 )
             {
                 this.UnLoad();
                 return false;
             }
             //WM_CAP_SET_PREVIEWRATE
             ret = SendMessage( hCaptureM, 1076, 66, 0 );
             if( ret == 0 )
             {
                 this.UnLoad();
                 return false;
             }
             return true;
         }        public void SingleFrameBegin()
         {
             //
             int ret = SendMessage( hCaptureM, 1094 , 0, 0 );
         }
         public void SingleFrameEnd()
         {
             //
             int ret = SendMessage( hCaptureM, 1095 , 0, 0 );
         }        public void SingleFrameMode()
         {
             //WM_CAP_GRAB_FRAME
             int ret = SendMessage(  hCaptureM, 1084 , 0, 0 );
             //WM_CAP_SET_PREVIEW 
             //int ret = SendMessage(  hCaptureM, 1074 , 0, 0 );
             //WM_CAP_SINGLE_FRAME
             //ret = SendMessage( hCaptureM, 1096 , 0, 0 );
         }
         public void PreviewMode()
         {
             int ret = SendMessage( hCaptureM, 1074 , 1, 0 );
         }                public void UnLoad()
         {
             int ret = SendMessage( hCaptureM, 1035, 0, 0 );
             CloseHandle( this.hCaptureM );
             isUnLoad = true;
         }        public void CopyToClipBorad()
         {
             int ret = SendMessage(  hCaptureM, 1054, 0, 0 );
         }        public void ShowFormatDialog()
         {
             int ret = SendMessage(  hCaptureM, 1065, 0, 0 );
         }
         public void SaveToDIB( string fileName )
         {
             int ret = SendMessage(  hCaptureM, 1049, 0, fileName );
         }        public void ShowDisplayDialog()
         {
             int ret = SendMessage( hCaptureM, 1067, 0, 0 );
         }
         public System.Drawing.Image getCaptureImage()
         {
             System.Windows.Forms.IDataObject iData = System.Windows.Forms.Clipboard.GetDataObject();
             System.Drawing.Image retImage = null;
             if( iData !=  null ) 
             {
                 if( iData.GetDataPresent( System.Windows.Forms.DataFormats.Bitmap ) )
                 {
                     retImage = (System.Drawing.Image)iData.GetData( System.Windows.Forms.DataFormats.Bitmap );
                 } 
                 else if( iData.GetDataPresent( System.Windows.Forms.DataFormats.Dib  ) )
                 {
                     retImage = (System.Drawing.Image)iData.GetData( System.Windows.Forms.DataFormats.Dib );
                 }
             }
             return retImage;
         }        ~VedioCapture()
         {
             if( !isUnLoad )
             {
                 this.UnLoad();
             }
         }
     }
 }