//调用的类(class1.cs) //本文是借助avicap32.dll库来驱动摄像头。做到了抓图、录像功能。
using System;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;

namespace TowDiaoYong
{
    ///
    /// 一个控制摄像头的类
    ///
    public class Pick
    {
        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 bStat = false;
        private IntPtr mControlPtr;
        private int mWidth;
        private int mHeight;
        private int mLeft;
        private int mTop;

        ///
        /// 初始化摄像头
        ///
        /// 控件的句柄
        /// 开始显示的左边距
        /// 开始显示的上边距
        /// 要显示的宽度
        /// 要显示的长度
        public Pick(IntPtr handle, int left, int top, int width, int height)
        {
            mControlPtr = 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, int wParam, int lParam);

        ///
        /// 开始显示图像
        ///
        public void Start()
        {
            if (bStat)
                return;
            bStat = 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, 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, 66, 0);
                SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
                SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
            }
            return;
        }

        ///
        /// 停止显示
        ///
        public void Stop()
        {
            SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
            //SendMessage(hWndC, WM_CAP_STOP, 0, 0);
            bStat = false;
        }

        ///
        /// 抓图
        ///
        /// 要保存bmp文件的路径
        public void GrabImage(string path)
        // public void GrabImage( )
        {
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
        }     
        
        ///
        /// 录像
        ///
        /// 要保存avi文件的路径
        public void Kinescope(string path)
        {
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32());
            SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
        }

        ///
        /// 停止录像
        ///
        public void StopKinescope()
        {
            SendMessage(hWndC, WM_CAP_STOP, 0, 0);
        }
    }
}

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 TowDiaoYong
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        // WebCamera wc;
        Pick pick;

        private void Form3_Load(object sender, 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();
            int left = 0;
            int top = 0;
            int width = 352;
            int height = 288;
            pick = new Pick(panelPreview.Handle, left, top, width, height);
            pick.Start();
        }

        protected override void OnClosing(CancelEventArgs e)
        {
            //if (MessageBox.Show("退出本系统?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
                Application.Exit();
            //else
            //    e.Cancel = true;
        }

        private void start_Click(object sender, 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(); 
            int left = 0;
            int top = 0;
            int width = 352;
            int height = 288;
            pick = new Pick(panelPreview.Handle, left, top, width, height);
            pick.Start();
        }

        private void jieshu_Click(object sender, EventArgs e)
        {
            //wc.CloseWebcam();
            pick.Stop();
        }

        private void b_pic_Click(object sender, EventArgs e)
        {
            if (this.b_pic.Text == "拍摄&A") //用于摄像的
            {
                b_pic.Text = "重照&C";
                string path;
                sdf1.Filter = "图片*.bmp;*.jpg;.jpeg;*.gif|*.bmp|所有文件(*.*)|*.*";
                if (sdf1.ShowDialog() == DialogResult.OK)
                {
                    path = sdf1.FileName;
                    pick.GrabImage(path);
                    pic_show.ImageLocation = path;  //并显示在方框中
                    pic_show.Location = new Point(110, 12);
                    pic_show.Visible = true;
                    panelPreview.Visible = false;
                    pick.Stop();
                }
            }
            else
            {
                b_pic.Text = "拍摄&A";
                pic_show.Visible = false;
                panelPreview.Location = new Point(110, 12);
                panelPreview.Visible = true;
                pick.Start();
            }
        }
    }
}