关于C#视频的问题？高手请进，大哥、大姐进来帮小弟看看呀？急呀？？？？

Question

给你个获得摄像头的代码，还有很热的帖子。
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);
???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 = 352;
????bitmapinfo.bmiHeader.biHeight = 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);
???} 
??}
?
??// 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);
??}
?}}

Answer 1

具体调用如下：using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using webcam;namespace webcam
{
?/// 
?/// Form1 的摘要说明。
?/// 
?public class Form1 : System.Windows.Forms.Form
?{
??private System.Windows.Forms.Panel panelPreview;
??private System.Windows.Forms.Button b_play;
??private System.Windows.Forms.Button b_stop;
??/// 
??/// 必需的设计器变量。
??/// 
??private System.ComponentModel.Container components = null;
??WebCamera wc;??public Form1()
??{
???//
???// Windows 窗体设计器支持所必需的
???//
???InitializeComponent();???//
???// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
???//
??}??/// 
??/// 清理所有正在使用的资源。
??/// 
??protected override void Dispose( bool disposing )
??{
???if( disposing )
???{
????if (components != null) 
????{
?????components.Dispose();
????}
???}
???base.Dispose( disposing );
??}??#region Windows 窗体设计器生成的代码
??/// 
??/// 设计器支持所需的方法 - 不要使用代码编辑器修改
??/// 此方法的内容。
??/// 
??private void InitializeComponent()
??{
???this.b_play = new System.Windows.Forms.Button();
???this.panelPreview = new System.Windows.Forms.Panel();
???this.b_stop = new System.Windows.Forms.Button();
???this.SuspendLayout();
???// 
???// b_play
???// 
???this.b_play.Location = new System.Drawing.Point(280, 368);
???this.b_play.Name = "b_play";
???this.b_play.TabIndex = 0;
???this.b_play.Text = "&Play";
???this.b_play.Click += new System.EventHandler(this.button1_Click);
???// 
???// panelPreview
???// 
???this.panelPreview.Location = new System.Drawing.Point(8, 8);
???this.panelPreview.Name = "panelPreview";
???this.panelPreview.Size = new System.Drawing.Size(344, 272);
???this.panelPreview.TabIndex = 1;
???// 
???// b_stop
???// 
???this.b_stop.Enabled = false;
???this.b_stop.Location = new System.Drawing.Point(360, 368);
???this.b_stop.Name = "b_stop";
???this.b_stop.TabIndex = 2;
???this.b_stop.Text = "&Stop";
???this.b_stop.Click += new System.EventHandler(this.b_stop_Click);
???// 
???// Form1
???// 
???this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
???this.ClientSize = new System.Drawing.Size(464, 413);
???this.Controls.Add(this.b_stop);
???this.Controls.Add(this.panelPreview);
???this.Controls.Add(this.b_play);
???this.MaximizeBox = false;
???this.MinimizeBox = false;
???this.Name = "Form1";
???this.Text = "GoodView test Web Camera";
???this.Load += new System.EventHandler(this.Form1_Load);
???this.ResumeLayout(false);??}
??#endregion??/// 
??/// 应用程序的主入口点。
??/// 
??[STAThread]
??static void Main() 
??{
???Application.Run(new Form1());
??}??private void Form1_Load(object sender, System.EventArgs e)
??{
???b_play.Enabled = false;
???b_stop.Enabled = true;
???panelPreview.Size = new Size(330,330);
???wc = new WebCamera( panelPreview.Handle,panelPreview.Width,panelPreview.Height);
???wc.StartWebCam();
??}??private void button1_Click(object sender, System.EventArgs e)
??{
???b_play.Enabled = false;
???b_stop.Enabled = true;
???panelPreview.Size = new Size(330,330);
???wc = new WebCamera( panelPreview.Handle,panelPreview.Width,panelPreview.Height);
???wc.StartWebCam();
??}??private void b_stop_Click(object sender, System.EventArgs e)
??{
???b_play.Enabled = true;
???b_stop.Enabled = false;
???wc.CloseWebcam();
??}
?}
}

Answer 2

视频技术vc++比较成熟，用的directX开发包，direact show direct play 什么的。。
知道IP，端口号，用户名和密码，如何能够直接连接读取出视频？ 
http://www.thecodeproject.com/cs/miscctrl/exposingdotnetcontrols.asp