摄像头编程安装摄像头后，一般可以找到一个avicap32.dll文件
这是一个关于设想头的类
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 );
// constantspublic 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 methodspublic 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 classpublic class WebCamera{// Constructurpublic WebCamera(IntPtr handle, int width,int height){mControlPtr = handle;mWidth = width;mHeight = height;}// delegate for frame callbackpublic delegate void RecievedFrameEventHandler(byte[] data);public event RecievedFrameEventHandler RecievedFrame;private IntPtr lwndC; // Holds the unmanaged handle of the controlprivate IntPtr mControlPtr; // Holds the managed pointer of the controlprivate 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 camerapublic void CloseWebcam(){this.capDriverDisconnect(this.lwndC);}// start the web camerapublic 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 functionsprivate 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();}}}
转载于:https://www.cnblogs.com/HappyQQ/archive/2008/04/20/1162851.html
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