c# 控制摄像头

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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Runtime.InteropServices; namespace Video{    class cVideo    {        //导入API函数        [DllImport("avicap32.dll")]        private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);        [DllImport("avicap32.dll")]        private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);        [DllImport("User32.dll")]        private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);        //常量设置        private const int WM_USER = 0x400;        private const int WS_CHILD = 0x40000000;        private const int WS_VISIBLE = 0x10000000;        private const int WM_CAP_START = WM_USER;        private const int WM_CAP_STOP = WM_CAP_START + 68;        private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;        private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;        private const int WM_CAP_SAVEDIB = WM_CAP_START + 25;        private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;        private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;        private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;        private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63;        private const int WM_CAP_SET_OVERLAY = WM_CAP_START + 51;        private const int WM_CAP_SET_PREVIEW = WM_CAP_START + 50;        private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;        private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;        private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;        private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;        private const int WM_CAP_SET_SCALE = WM_CAP_START + 53;        private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52;        private const int WM_CAP_FILE_SAVEAS = WM_CAP_START + 23; //将捕捉文件保存为另一个用户指定的文件。这个消息不会改变捕捉文件的名字和内容,         //全局变量        private IntPtr hWndC;　//句柄        private IntPtr mControlPtr;　//句柄        private bool bWorkStart = false;        private int mWidth;　　//视频显示宽度        private int mHeight; //视频显示高度        private int mLeft; //视频显示左边距        private int mTop; //视频显示上边距        /// <summary>           /// 初始化显示图像           /// </summary>           /// <param name="handle">播放视频控件的句柄</param>           /// <param name="left">视频显示的左边距</param>           /// <param name="top">视频显示的上边距</param>        /// <param name="down">视频显示的下边距</param>        /// <param name="right">视频显示的右边距</param>        /// <param name="width">要显示视频的宽度</param>           /// <param name="height">要显示视频的长度</param>           public cVideo(IntPtr handle, int left, int top, int width, int height)        {            mControlPtr = handle;            mWidth = width;            mHeight = height;            mLeft = left;            mTop = top;        }        /// <summary>           /// 打开视频          /// </summary>           public void StartVideo()        {            if (bWorkStart)                return;            bWorkStart = true;            byte[] lpszName = new byte[100];            //创建播放窗口            hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);             if (hWndC.ToInt32() != 0)            {                //显示视频                SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);                SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);                SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);                SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);                SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);                SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 100, 0);                SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);                SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);            }        }        /// <summary>           /// 关闭视频           /// </summary>           public void StopVideo()        {            SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);            bWorkStart = false;        }         /// <summary>        /// 拍照        /// </summary>        /// <param name="path">文件路径</param>        public void Images(string path)        {            IntPtr imagePath = Marshal.StringToHGlobalAnsi(path);            SendMessage(hWndC, WM_CAP_SAVEDIB, 0, imagePath.ToInt32());        }     }}

转自：http://zhidao.baidu.com/link?url=AJ8sBHbC1yL2xYH4dIUfhuHYK2J75mMG7YVaTPP1q0IqDytHqfgzRSKVDU5q43pPCKLsjli03z40k1Uibb5dLK

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