利用C#摄像头编程实现驱动开发 & 相关资料

C#摄像头编程代码经改造和调试，如下：

(1)安装摄像头后，一般可以找到一个avicap32.dll文件

(2)这是一个关于C#摄像头编程的类:

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);  
  }  
 }  
}  
 
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();  
  }  
 }  
}  

另外的一些C#摄像头编程资料：

Motion Detection Algorithms http://www.codeproject.com/cs/media/Motion_Detection.asp （英文）

Motion detection using web cam http://www.codeproject.com/cs/media/motion_detection_wc.asp （英文）

AVPhone Controls  http://www.banasoft.net/avphone3/avphone3.htm（英文）

Visual C#使用DirectX实现视频播放 http://www.chinaitpower.net/2006Aug/2006-08-19/212417.html (C#)

使用.NET实现视频播放 http://www.chinaitpower.net/A200507/2005-07-27/167331.html

嵌入式Web视频点播系统实现方法 http://www.java-asp.net/java/200504/t_14439.html(JAVA)

以下是FLASH方面的解决方案:

关于FMS视频在线录制的学习记录... http://pigz.cn/blog/article.asp?id=131

[教程]利用FMS做在线视频录制 http://www.cincn.com/article.asp?id=15&page=2

在线录制系统 http://blog.chinaunix.net/u/17508/showart.php?id=202778

WPF中的解决方案:(使用WPF解决视频的相关问题最方便!)

Building an Interactive 3D Video Player http://www.contentpresenter.com/contentpresenter_3DTools.wmv）(视频教程)