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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 WindowsFormsApplication24{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }              const short WM_CAP = 1024;        const int WM_CAP_DRIVER_CONNECT = WM_CAP + 10;        const int WM_CAP_DRIVER_DISCONNECT = WM_CAP + 11;        const int WM_CAP_EDIT_COPY = WM_CAP + 30;        const int WM_CAP_SET_PREVIEW = WM_CAP + 50;        const int WM_CAP_SET_PREVIEWRATE = WM_CAP + 52;        const int WM_CAP_SET_SCALE = WM_CAP + 53;        const int WS_CHILD = 1073741824;        const int WS_VISIBLE = 268435456;        const short SWP_NOMOVE = 2;        const short SWP_NOSIZE = 1;        const short SWP_NOZORDER = 4;        const short HWND_BOTTOM = 1;        int iDevice = 0;        int hHwnd;        [System.Runtime.InteropServices.DllImport("user32", EntryPoint = "SendMessageA")]        static extern int SendMessage(int hwnd, int wMsg, int wParam, [MarshalAs(UnmanagedType.AsAny)] 			object lParam);        [System.Runtime.InteropServices.DllImport("user32", EntryPoint = "SetWindowPos")]        static extern int SetWindowPos(int hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);        [System.Runtime.InteropServices.DllImport("user32")]        static extern bool DestroyWindow(int hndw);        [System.Runtime.InteropServices.DllImport("avicap32.dll")]        static extern int capCreateCaptureWindowA(string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID);        [System.Runtime.InteropServices.DllImport("avicap32.dll")]        static extern bool capGetDriverDescriptionA(short wDriver, string lpszName, int cbName, string lpszVer, int cbVer);        private void OpenPreviewWindow()        {            int iHeight = 320;            int iWidth = 200;            //             //  Open Preview window in picturebox            //             hHwnd = capCreateCaptureWindowA(iDevice.ToString(), (WS_VISIBLE | WS_CHILD), 0, 0, 640, 480, picCapture.Handle.ToInt32(), 0);            //             //  Connect to device            //             if (SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) == 1)            {                //                 // Set the preview scale                //                 SendMessage(hHwnd, WM_CAP_SET_SCALE, 1, 0);                //                 // Set the preview rate in milliseconds                //                 SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0);                //                 // Start previewing the image from the camera                //                 SendMessage(hHwnd, WM_CAP_SET_PREVIEW, 1, 0);                //                 //  Resize window to fit in picturebox                //                 SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, iWidth, iHeight, (SWP_NOMOVE | SWP_NOZORDER));            }            else            {                //                 //  Error connecting to device close window                //                  DestroyWindow(hHwnd);            }        }        private void ClosePreviewWindow()        {            //             //  Disconnect from device            //             SendMessage(hHwnd, WM_CAP_DRIVER_DISCONNECT, iDevice, 0);            //             //  close window            //             DestroyWindow(hHwnd);        }             private void button1_Click(object sender, EventArgs e)        {            iDevice = int.Parse(device_number_textBox.Text);            OpenPreviewWindow();        }    }}

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