class sti
    {
        [DllImport("kernel32.dll")]
        public extern static IntPtr GetModuleHandleW(string lpModuleName);

        [DllImport("Sti.dll", CharSet = CharSet.Unicode)]
        public extern static int StiCreateInstanceW(IntPtr hinst, uint dwVer, [Out,
       MarshalAs(UnmanagedType.Interface)] out IStillImage ppSti, object
       punkOuter);

        const int STI_VERSION = 0x00000002;

        static void Main(string[] args)
        {
            IStillImage StillImage;
            StiCreateInstanceW(GetModuleHandleW(null), STI_VERSION, out StillImage, null);
            StillImage.RegisterLaunchApplication("MyApp", "C:\\Windows\\notepad.exe");
        }
    }

    public enum STI_DEVICE_TYPE : int
    {

        StiDeviceTypeDefault = 0,

        StiDeviceTypeScanner = 1,

        StiDeviceTypeDigitalCamera = 2,

        StiDeviceTypeStreamingVideo = 3

    }
    

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct STI_DEV_CAPS
    {

        public int dwGeneric;

    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct STI_DEVICE_INFORMATIONW
    {

        private const int STI_MAX_INTERNAL_NAME_LENGTH = 128;

        public int dwSize;

        public STI_DEVICE_TYPE DeviceType;

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = STI_MAX_INTERNAL_NAME_LENGTH)]

        string szDeviceInternalName;

        public STI_DEV_CAPS DeviceCapabilities;

        public int dwHardwareConfiguration;

        [MarshalAs(UnmanagedType.LPWStr)]

        public string pszVendorDescription;

        [MarshalAs(UnmanagedType.LPWStr)]

        public string pszDeviceDescription;

        [MarshalAs(UnmanagedType.LPWStr)]

        public string pszPortName;

        [MarshalAs(UnmanagedType.LPWStr)]

        public string pszPropProvider;

        [MarshalAs(UnmanagedType.LPWStr)]

        public string pszLocalName;

    }

    [Guid("641BD880-2DC8-11D0-90EA-00AA0060F86C"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IStillImage
    {
        void RegisterLaunchApplication([In, MarshalAs(UnmanagedType.LPWStr)] string
pwszAppName, [In, MarshalAs(UnmanagedType.LPWStr)] string pwszCommandLine);
        
        void GetDeviceList([In] int dwType, [In] int dwFlags, [Out] out int
       pdwItemsReturned, [In, Out] IntPtr ppBuffer);

        void GetDeviceInfo([In, MarshalAs(UnmanagedType.LPWStr)] string
       pwszDeviceName, [In, Out] IntPtr ppBuffer);

        void CreateDevice([In, MarshalAs(UnmanagedType.LPWStr)] string
       pwszDeviceName, [In] int dwMode, [In, Out] IntPtr pDevice, [In, Out] IntPtr
       punkOuter);

        void SetDeviceValue([In, MarshalAs(UnmanagedType.LPWStr)] string
       pwszDeviceName, [In, MarshalAs(UnmanagedType.LPWStr)] string pValueName,
       [In] int Type, [In, Out] IntPtr pData, [In] int cbData);

        void GetDeviceValue([In, MarshalAs(UnmanagedType.LPWStr)] string
       pwszDeviceName, [In, MarshalAs(UnmanagedType.LPWStr)] string pValueName,
       [In, Out] ref int pType, [In, Out] IntPtr pData, [In, Out] ref int cbData);

        void GetSTILaunchInformation([In, Out, MarshalAs(UnmanagedType.LPWStr)] ref
string pwszDeviceName, [In, Out] ref int pdwEventCode, [In, Out,
MarshalAs(UnmanagedType.LPWStr)] ref string pwszEventName);

        void UnregisterLaunchApplication([In, MarshalAs(UnmanagedType.LPWStr)]
string pwszAppName);

        void EnableHwNotifications([In, MarshalAs(UnmanagedType.LPWStr)] string
       pwszDeviceName, [In] bool bNewState);

        void GetHwNotificationState([In, MarshalAs(UnmanagedType.LPWStr)] string
       pwszDeviceName, [In, Out] ref bool pbCurrentState);

        void RefreshDeviceBus([In, MarshalAs(UnmanagedType.LPWStr)] string
       pwszDeviceName);

        void LaunchApplicationForDevice([In, MarshalAs(UnmanagedType.LPWStr)]
string pwszDeviceName, [In, MarshalAs(UnmanagedType.LPWStr)] string
pwszAppName, [In, Out] IntPtr pStiNofify);

        void SetupDeviceParameters([In, Out] ref STI_DEVICE_INFORMATIONW
       pDeviceInfo);

        void WriteToErrorLog([In] int dwMessageType, [In,
       MarshalAs(UnmanagedType.LPWStr)] string pszMessage);

       }