怎么在做一个网络摄像头程序

如何在做一个网络摄像头程序
如何得到视频流，并保存！

[解决办法]
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();
}
}
}
}
[解决办法]
以CathySun118(斯年)发的为例， private int hCaptureM; 定义一个句柄；

capCreateCaptureWindow( " ", 0x40000000 | 0x10000000, 0,0,intWidth,intHeight,aContainer.Handle.ToInt32() ,1 ); 取得了句柄；
然后调用了sendmessage（）根据不同的参数向句柄发送不同的消息，调用不同的接口，
从而实现视频捕捉等功能！