实例介绍
【实例简介】
【实例截图】
【核心代码】
using System; using System.Runtime.InteropServices; namespace ServerDLL { /// /// avicap 的摘要说明。 /// public class ClassShowVideo { // ClassShowVideo 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 ClassShowVideo.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]; ClassShowVideo.capGetDriverDescriptionA(0, lpszName, 100,lpszVer, 100); this.lwndC = ClassShowVideo.capCreateCaptureWindowA(lpszName, ClassShowVideo.WS_VISIBLE ClassShowVideo.WS_CHILD, 0, 0, mWidth, mHeight, mControlPtr, 0); if (this.capDriverConnect(this.lwndC, 0)) { this.capPreviewRate(this.lwndC, 66); this.capPreview(this.lwndC, true); ClassShowVideo.BITMAPINFO bitmapinfo = new ClassShowVideo.BITMAPINFO(); bitmapinfo.bmiHeader.biSize = ClassShowVideo.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, ClassShowVideo.SizeOf(bitmapinfo)); this.mFrameEventHandler = new ClassShowVideo.FrameEventHandler(FrameCallBack); this.capSetCallbackOnFrame(this.lwndC, this.mFrameEventHandler); ClassShowVideo.SetWindowPos(this.lwndC, 0, 0, 0, mWidth , mHeight , 6); } } // private functions private bool capDriverConnect(IntPtr lwnd, short i) { return ClassShowVideo.SendMessage(lwnd, ClassShowVideo.WM_CAP_DRIVER_CONNECT, i, 0); } private bool capDriverDisconnect(IntPtr lwnd) { return ClassShowVideo.SendMessage(lwnd, ClassShowVideo.WM_CAP_DRIVER_DISCONNECT, 0, 0); } private bool capPreview(IntPtr lwnd, bool f) { return ClassShowVideo.SendMessage(lwnd, ClassShowVideo.WM_CAP_SET_PREVIEW , f, 0); } private bool capPreviewRate(IntPtr lwnd, short wMS) { return ClassShowVideo.SendMessage(lwnd, ClassShowVideo.WM_CAP_SET_PREVIEWRATE, wMS, 0); } private bool capSetCallbackOnFrame(IntPtr lwnd, ClassShowVideo.FrameEventHandler lpProc) { return ClassShowVideo.SendMessage(lwnd, ClassShowVideo.WM_CAP_SET_CALLBACK_FRAME, 0, lpProc); } private bool capSetVideoFormat(IntPtr hCapWnd, ref ClassShowVideo.BITMAPINFO BmpFormat, int CapFormatSize) { return ClassShowVideo.SendMessage(hCapWnd, ClassShowVideo.WM_CAP_SET_VIDEOFORMAT, CapFormatSize, ref BmpFormat); } private void FrameCallBack(IntPtr lwnd, IntPtr lpVHdr) { ClassShowVideo.VIDEOHDR videoHeader = new ClassShowVideo.VIDEOHDR(); byte[] VideoData; videoHeader = (ClassShowVideo.VIDEOHDR)ClassShowVideo.GetStructure(lpVHdr,videoHeader); VideoData = new byte[videoHeader.dwBytesUsed]; ClassShowVideo.Copy(videoHeader.lpData ,VideoData); if (this.RecievedFrame != null) this.RecievedFrame (VideoData); } } }
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