思路说明

主要是调用Win32API（avicap32.dll）实现。

关键代码

AviCapture.dll

using System;
using System.Runtime.InteropServices;namespace Wongoing.Basic.Camera
{/// <summary>/// AviCapture 的摘要说明。/// </summary>public class AviCapture{//通过调用acicap32.dll进行读取摄像头数据[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);//部分常量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;// 结构[StructLayout(LayoutKind.Sequential)]//VideoHdrpublic 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)]//BitmapInfoHeaderpublic 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)]//BitmapInfopublic 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);// 公共函数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);}}
}

Camera.dll

using System;
using System.Runtime.InteropServices;namespace Wongoing.Basic.Camera
{/// <summary>/// 相机类定义/// </summary>public class Camera{private IntPtr lwndC;private IntPtr mControlPtr;private int mWidth;private int mHeight;/// <summary>/// 构造函数/// </summary>/// <param name="handle"></param>/// <param name="width"></param>/// <param name="height"></param>public Camera(IntPtr handle, int width,int height){mControlPtr = handle;mWidth = width;mHeight = height;}// 帧回调的委托public delegate void RecievedFrameEventHandler(byte[] data);public event RecievedFrameEventHandler RecievedFrame;private AviCapture.FrameEventHandler mFrameEventHandler;/// <summary>/// 关闭摄像头/// </summary>public void CloseWebcam(){this.capDriverDisconnect(this.lwndC);}/// <summary>/// 开启摄像头/// </summary>public void StartWebCam(){byte[] lpszName = new byte[100];byte[] lpszVer = new byte[100];AviCapture.capGetDriverDescriptionA(0, lpszName, 100,lpszVer, 100);this.lwndC = AviCapture.capCreateCaptureWindowA(lpszName, AviCapture.WS_VISIBLE + AviCapture.WS_CHILD, 0, 0, mWidth, mHeight, mControlPtr, 0);if (this.capDriverConnect(this.lwndC, 0)){this.capPreviewRate(this.lwndC, 66);this.capPreview(this.lwndC, true);AviCapture.BITMAPINFO bitmapinfo = new AviCapture.BITMAPINFO(); bitmapinfo.bmiHeader.biSize = AviCapture.SizeOf(bitmapinfo.bmiHeader);bitmapinfo.bmiHeader.biWidth = this.mWidth;bitmapinfo.bmiHeader.biHeight = this.mHeight;bitmapinfo.bmiHeader.biPlanes = 1;bitmapinfo.bmiHeader.biBitCount = 24;this.capSetVideoFormat(this.lwndC, ref bitmapinfo, AviCapture.SizeOf(bitmapinfo));this.mFrameEventHandler = new AviCapture.FrameEventHandler(FrameCallBack);this.capSetCallbackOnFrame(this.lwndC, this.mFrameEventHandler);AviCapture.SetWindowPos(this.lwndC, 0, 0, 0, mWidth , mHeight , 6);} }#region 私有方法定义private bool capDriverConnect(IntPtr lwnd, short i){return AviCapture.SendMessage(lwnd, AviCapture.WM_CAP_DRIVER_CONNECT, i, 0);}private bool capDriverDisconnect(IntPtr lwnd){return AviCapture.SendMessage(lwnd, AviCapture.WM_CAP_DRIVER_DISCONNECT, 0, 0);}private bool capPreview(IntPtr lwnd, bool f){return AviCapture.SendMessage(lwnd, AviCapture.WM_CAP_SET_PREVIEW , f, 0);}private bool capPreviewRate(IntPtr lwnd, short wMS){return AviCapture.SendMessage(lwnd, AviCapture.WM_CAP_SET_PREVIEWRATE, wMS, 0);}private bool capSetCallbackOnFrame(IntPtr lwnd, AviCapture.FrameEventHandler lpProc){ return AviCapture.SendMessage(lwnd, AviCapture.WM_CAP_SET_CALLBACK_FRAME, 0, lpProc);}private bool capSetVideoFormat(IntPtr hCapWnd, ref AviCapture.BITMAPINFO BmpFormat, int CapFormatSize){return AviCapture.SendMessage(hCapWnd, AviCapture.WM_CAP_SET_VIDEOFORMAT, CapFormatSize, ref BmpFormat);}private void FrameCallBack(IntPtr lwnd, IntPtr lpVHdr){AviCapture.VIDEOHDR videoHeader = new AviCapture.VIDEOHDR();byte[] VideoData;videoHeader = (AviCapture.VIDEOHDR)AviCapture.GetStructure(lpVHdr,videoHeader);VideoData = new byte[videoHeader.dwBytesUsed];AviCapture.Copy(videoHeader.lpData ,VideoData);if (this.RecievedFrame != null)this.RecievedFrame (VideoData);}#endregion}
}

完整代码下载

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C#控制摄像头实现画面实时播放

C#控制摄像头实现画面实时播放

思路说明

关键代码

完整代码下载

C#控制摄像头实现画面实时播放相关推荐

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