利用C#攝像頭編程實現驅動開發
C#攝像頭編程代碼經改造和調試,如下:
(1)安裝攝像頭后,一般可以找到一個avicap32.dll文件
(2)這是一個關于C#攝像頭編程的類:
- using System;
- using System.Runtime.InteropServices;
- namespace webcam
- {
- ///
- /// avicap 的摘要說明。
- ///
- 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);
- }
- }
- }
- 具體調用如下:
- using System;
- using System.Drawing;
- using System.Collections;
- using System.ComponentModel;
- using System.Windows.Forms;
- using System.Data;
- using webcam;
- namespace webcam
- {
- ///
- /// Form1 的摘要說明。
- ///
- 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;
- ///
- /// 必需的設計器變量。
- ///
- private System.ComponentModel.Container components = null;
- WebCamera wc;
- public Form1()
- {
- //
- // Windows 窗體設計器支持所必需的
- //
- InitializeComponent();
- //
- // TODO: 在 InitializeComponent 調用后添加任何構造函數代碼
- //
- }
- ///
- /// 清理所有正在使用的資源。
- ///
- protected override void Dispose( bool disposing )
- {
- if( disposing )
- {
- if (components != null)
- {
- components.Dispose();
- }
- }
- base.Dispose( disposing );
- }
- #region Windows 窗體設計器生成的代碼
- ///
- /// 設計器支持所需的方法 - 不要使用代碼編輯器修改
- /// 此方法的內容。
- ///
- 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
- ///
- /// 應用程序的主入口點。
- ///
- [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#攝像頭編程資料:
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實現視頻播放 http://www.chinaitpower.net/2006Aug/2006-08-19/212417.html (C#)
使用.NET實現視頻播放 http://www.chinaitpower.net/A200507/2005-07-27/167331.html
嵌入式Web視頻點播系統實現方法 http://www.java-asp.net/java/200504/t_14439.html(JAVA)
以下是FLASH方面的解決方案:
關于FMS視頻在線錄制的學習記錄... http://pigz.cn/blog/article.asp?id=131
[教程]利用FMS做在線視頻錄制 http://www.cincn.com/article.asp?id=15&page=2
在線錄制系統 http://blog.chinaunix.net/u/17508/showart.php?id=202778
WPF中的解決方案:(使用WPF解決視頻的相關問題最方便!)
Building an Interactive 3D Video Player http://www.contentpresenter.com/contentpresenter_3DTools.wmv)(視頻教程)
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