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The author:(作者)delvpublished in(发表于) 2014/1/6 9:06:46 C#捕捉摄相头的数据流_[Asp.Net教程]
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); } }
}下面是实现的代码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();
//// TOD 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 );}
Windows 窗体设计器生成的代码#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();}}}
来源:网络
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