C#捕捉视频头(源码)

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();
            }
        }
    }
}