分享一个C#调用摄像头的类

using System;

using System.Collections.Generic;
using System.Text;

using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;

namespace Camera
{
    /// <summary>
    /// 一个控制摄像头的类
    /// </summary>
    public class PCCamera
    {
        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 IntPtr hWndC;
        private bool bWorkStart = false;
        private IntPtr mControlPtr;
        private int mWidth;
        private int mHeight;
        private int mLeft;
        private int mTop;

        /// <summary>
        /// 初始化显示图像
        /// </summary>
        /// <param name="handle">控件的句柄 </param>
        /// <param name="left">开始显示的左边距 </param>
        /// <param name="top">开始显示的上边距 </param>
        /// <param name="width">要显示的宽度 </param>
        /// <param name="height">要显示的长度 </param>
        public PCCamera(IntPtr handle, int left, int top, int width, int height)   //PCCamera
{= handle;
            mWidth = width;
            mHeight = height;
            mLeft = left;
            mTop = top;
        }

        [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, IntPtr wParam, IntPtr lParam);
   
        /// <summary>
        /// 开始显示图像
        /// </summary>
        public void Start()
        {
            if (bWorkStart)
                return;
            bWorkStart = true;
            byte[] lpszName = new byte[100];
            hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);
            if (hWndC.ToInt32() != 0)
            {
                SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, IntPtr.Zero, IntPtr.Zero);
                SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, IntPtr.Zero, IntPtr.Zero);
                SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, IntPtr.Zero, IntPtr.Zero);
                SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, IntPtr.Zero, IntPtr.Zero);
                SendMessage(hWndC, WM_CAP_SET_SCALE, (IntPtr) 1, IntPtr.Zero);
                SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, (IntPtr)66, IntPtr.Zero);
                SendMessage(hWndC, WM_CAP_SET_OVERLAY, (IntPtr)1, IntPtr.Zero);
                SendMessage(hWndC, WM_CAP_SET_PREVIEW, (IntPtr)1, IntPtr.Zero);
            }
            return;
        }
        /// <summary>
        /// 停止显示图像
        /// </summary>
        public void Stop()
        {
            SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, IntPtr.Zero, IntPtr.Zero);
            bWorkStart = false;
        }

        /// <summary>
        /// 抓图
        /// </summary>
        /// <param name="path">要保存bmp文件的路径 </param>
        public void GrabImage(string path)
        {
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            SendMessage(hWndC, WM_CAP_SAVEDIB, IntPtr.Zero , hBmp);
        }

        ///<summary>
        ///录像
        ///</summary>
        ///<param name="path">要保存avi文件的路径</param>
        public void Kinescope(string path)
        {
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, IntPtr.Zero,hBmp );
            SendMessage(hWndC, WM_CAP_SEQUENCE, IntPtr.Zero,IntPtr.Zero );
        }

        ///<summary>
        ///停止录像
        ///</summary>
        public void StopKinescope()
        {
            SendMessage(hWndC, WM_CAP_STOP, IntPtr.Zero, IntPtr.Zero);
        }
    
    }
}

mControlPtr

==========================================================================
操作摄像头的代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Temp
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
            pcc = new Camera.PCCamera(this.panelCamera.Handle, 0, 0, 320, 240); //panelCamera is Control panel
        }

        private Camera.PCCamera pcc;
   
        //开始
        private void btnStart_Click(object sender, EventArgs e)
        {
           pcc.Start();
        }

        //停止
        private void btnStop_Click(object sender, EventArgs e)
        {
           pcc.Stop();
        }

        //截图
        private void btnSaveImage_Click(object sender, EventArgs e)
        {
           pcc.GrabImage("c:\\" + System.DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg");
        }

        //录像
        private void btnKinescope_Click(object sender, EventArgs e)
        {
           pcc.Kinescope("c:\\" + System.DateTime.Now.ToString("yyyyMMddHHmmss") + ".avi");
        }

        //停止录像
        private void btnStopKinescope_Click(object sender, EventArgs e)
        {
           Application.DoEvents();
           pcc.StopKinescope();
        }
    }
}