C # simple Turn off camera

        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 = 0x40000000;        const int ws_visible = 0x10000000;        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 (in T 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 Lpszwin        downame, int dwstyle, int x, int y, int nwidth, int nheight, int hwndparent, int nID); [System.Runtime.InteropServices.DllImport ("Avicap32.dll")] static extern bool Capgetdriverdescriptiona (short wdrive        R, string lpszName, int cbname, string lpszver, int cbver);            private void Openpreviewwindow () {int iheight = 600;            int iwidth = 800; Open Preview window in picturebox//Hhwnd = Capcreatecapturewindowa (idevice.tostr ING (), (ws_visible |            Ws_child), 0, 0, iwidth, iheight, PicCapture.Handle.ToInt32 (), 0); Connect to Device//if (SendMessage (Hhwnd, Wm_cap_driver_connect, IDevice, 0) = = 1) {////Set The preview scale/S                Endmessage (Hhwnd, Wm_cap_set_scale, 1, 0); Set the preview rate in milliseconds//SendMessage (Hhwnd, wm_cap_set_p                Reviewrate, 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); The private void Button1_Click (object sender, EventArgs e) {iDevice = 0;//int.            Parse (Device_number_textbox.text);        Openpreviewwindow (); }

　　

C # simple Turn off camera