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   源码介绍

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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;
using System.Runtime.InteropServices;

namespace testcam
{
    public partial class Form2 : Form
    {
        cVideo video;

        public Form2()
        {
            InitializeComponent();
        }

        public class VideoAPI //视频API类
        {
            // 视频API调用
            [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);

            // 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;
            public const int WM_CAP_START = WM_USER;
            public const int WM_CAP_SAVEDIB = WM_CAP_START   25;
        }

        public class cVideo     //视频类
        {
            private IntPtr lwndC;       //保存无符号句柄
            private IntPtr mControlPtr; //保存管理指示器
            private int mWidth;
            private int mHeight;
            public cVideo(IntPtr handle, int width, int height)
            {
                mControlPtr = handle; //显示视频控件的句柄
                mWidth = width;      //视频宽度
                mHeight = height;    //视频高度
            }

            /// <summary>
            /// 打开视频设备
            /// </summary>
            public void StartWebCam()
            {
                byte[] lpszName = new byte[100];
                byte[] lpszVer = new byte[100];
                VideoAPI.capGetDriverDescriptionA(0, lpszName, 100, lpszVer, 100);
                this.lwndC = VideoAPI.capCreateCaptureWindowA(lpszName, VideoAPI.WS_CHILD | VideoAPI.WS_VISIBLE, 0, 0, mWidth, mHeight, mControlPtr, 0);
                if (VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0))
                {
                    VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEWRATE, 100, 0);
                    VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEW, true, 0);
                }
            }

            /// <summary>
            /// 关闭视频设备
            /// </summary>
            public void CloseWebcam()
            {
                VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_DISCONNECT, 0, 0);
            }

            ///   <summary>  
            ///   拍照
            ///   </summary>  
            ///   <param   name="path">要保存bmp文件的路径</param>  
            public void GrabImage(IntPtr hWndC, string path)
            {
                IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
                VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            video = new cVideo(pictureBox1.Handle, pictureBox1.Width, pictureBox1.Height);
            video.StartWebCam();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            video.CloseWebcam();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            video.GrabImage(pictureBox1.Handle, "d:\\a.jpg");
        }
    }
}