using System;
using System.Runtime.InteropServices;

namespace SSComm
{
    internal sealed partial class DeviceManagement
    {
        ///<summary >
        // API declarations relating to device management (SetupDixxx and 
        // RegisterDeviceNotification functions).   
        /// </summary>

        // from dbt.h

        internal const Int32 DBT_DEVICEARRIVAL = 0X8000;
        internal const Int32 DBT_DEVICEREMOVECOMPLETE = 0X8004;
        internal const Int32 DBT_DEVTYP_DEVICEINTERFACE = 5;
        internal const Int32 DBT_DEVTYP_HANDLE = 6;
        internal const Int32 DEVICE_NOTIFY_ALL_INTERFACE_CLASSES = 4;
        internal const Int32 DEVICE_NOTIFY_SERVICE_HANDLE = 1;
        internal const Int32 DEVICE_NOTIFY_WINDOW_HANDLE = 0;
        internal const Int32 WM_DEVICECHANGE = 0X219;

        // from setupapi.h

        internal const Int32 DIGCF_PRESENT = 2;
        internal const Int32 DIGCF_DEVICEINTERFACE = 0X10;

        // Two declarations for the DEV_BROADCAST_DEVICEINTERFACE structure.

        // Use this one in the call to RegisterDeviceNotification() and
        // in checking dbch_devicetype in a DEV_BROADCAST_HDR structure:

        [StructLayout(LayoutKind.Sequential)]
        internal class DEV_BROADCAST_DEVICEINTERFACE
        {
            internal Int32 dbcc_size;
            internal Int32 dbcc_devicetype;
            internal Int32 dbcc_reserved;
            internal Guid dbcc_classguid;
            internal Int16 dbcc_name;
        }

        // Use this to read the dbcc_name String and classguid:

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        internal class DEV_BROADCAST_DEVICEINTERFACE_1
        {
            internal Int32 dbcc_size;
            internal Int32 dbcc_devicetype;
            internal Int32 dbcc_reserved;
            [MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.U1, SizeConst = 16)]
            internal Byte[] dbcc_classguid;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 255)]
            internal Char[] dbcc_name;
        }

        [StructLayout(LayoutKind.Sequential)]
        internal class DEV_BROADCAST_HDR
        {
            internal Int32 dbch_size;
            internal Int32 dbch_devicetype;
            internal Int32 dbch_reserved;
        }

        internal struct SP_DEVICE_INTERFACE_DATA
        {
            internal Int32 cbSize;
            internal System.Guid InterfaceClassGuid;
            internal Int32 Flags;
            internal IntPtr Reserved;
        }

        internal struct SP_DEVICE_INTERFACE_DETAIL_DATA
        {
            internal Int32 cbSize;
            internal String DevicePath;
        }

        internal struct SP_DEVINFO_DATA
        {
            internal Int32 cbSize;
            internal System.Guid ClassGuid;
            internal Int32 DevInst;
            internal Int32 Reserved;
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        internal static extern IntPtr RegisterDeviceNotification(IntPtr hRecipient, IntPtr NotificationFilter, Int32 Flags);

        [DllImport("setupapi.dll", SetLastError = true)]
        internal static extern Int32 SetupDiCreateDeviceInfoList(ref System.Guid ClassGuid, Int32 hwndParent);

        [DllImport("setupapi.dll", SetLastError = true)]
        internal static extern Int32 SetupDiDestroyDeviceInfoList(IntPtr DeviceInfoSet);

        [DllImport("setupapi.dll", SetLastError = true)]
        internal static extern Boolean SetupDiEnumDeviceInterfaces(IntPtr DeviceInfoSet, IntPtr DeviceInfoData, ref System.Guid InterfaceClassGuid, Int32 MemberIndex, ref SP_DEVICE_INTERFACE_DATA DeviceInterfaceData);

        [DllImport("setupapi.dll", SetLastError = true, CharSet = CharSet.Auto)]
        internal static extern IntPtr SetupDiGetClassDevs(ref System.Guid ClassGuid, IntPtr Enumerator, IntPtr hwndParent, Int32 Flags);

        [DllImport("setupapi.dll", SetLastError = true, CharSet = CharSet.Auto)]
        internal static extern Boolean SetupDiGetDeviceInterfaceDetail(IntPtr DeviceInfoSet, ref SP_DEVICE_INTERFACE_DATA DeviceInterfaceData, IntPtr DeviceInterfaceDetailData, Int32 DeviceInterfaceDetailDataSize, ref Int32 RequiredSize, IntPtr DeviceInfoData);

        [DllImport("user32.dll", SetLastError = true)]
        internal static extern Boolean UnregisterDeviceNotification(IntPtr Handle);
    }
}