ダメプログラマーのチラシウラ ローカルネットワークの接続 有効・無効


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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

public class NetWorkUtil
{
   #region プロパティ
   private static Guid GUID_DEVCLASS_NET = new Guid(0x4d36e972, 0xe325, 0x11ce, 0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18);
   private const int DIGCF_PRESENT = 2;
   private const int DIF_PROPERTYCHANGE = 0x00000012;
   private const int DICS_FLAG_GLOBAL = 0x00000001;
   private const int INVALID_HANDLE_VALUE = -1;
   private const int DICS_ENABLE = 0x00000001;
   private const int DICS_DISABLE = 0x00000002;
   private const int DICS_FLAG_CONFIGSPECIFIC = 0x00000002;
   [StructLayout(LayoutKind.Sequential)]
   private struct SP_DEVINFO_DATA
   {
       public int cbSize;
       public Guid ClassGuid;
       public int DevInst;
       public int Reserved;
   }
   [StructLayout(LayoutKind.Sequential)]
   private struct SP_CLASSINSTALL_HEADER
   {
       public int cbSize;
       public int InstallFunction;
   }
   [StructLayout(LayoutKind.Sequential)]
   private struct SP_PROPCHANGE_PARAMS
   {
       public SP_CLASSINSTALL_HEADER ClassInstallHeader;
       public int StateChange;
       public int Scope;
       public int HwProfile;
       public void Init()
       {
           ClassInstallHeader = new SP_CLASSINSTALL_HEADER();
       }

   }
   #endregion

   #region SetUp API
   [DllImport("setupapi.dll")]
   private static extern IntPtr SetupDiGetClassDevs(ref Guid ClassGuid, IntPtr Enumerator, IntPtr hWndParent, int Flags);
   [DllImport("setupapi.dll")]
   private static extern bool SetupDiEnumDeviceInfo(IntPtr DeviceInfoSet, int Supplies, ref SP_DEVINFO_DATA DeviceInfoData);
   [DllImport("setupapi.dll")]
   private static extern bool SetupDiDestroyDeviceInfoList(IntPtr DeviceInfoSet);
   [DllImport("setupapi.dll")]
   private static extern bool SetupDiSetClassInstallParams(IntPtr DeviceInfoSet, ref SP_DEVINFO_DATA DeviceInfoData, ref SP_CLASSINSTALL_HEADER ClassInstallParams, int ClassInstallParamsSize);
   [DllImport("setupapi.dll")]
   private static extern bool SetupDiCallClassInstaller(int InstallFunction, IntPtr DeviceInfoSet, ref SP_DEVINFO_DATA DeviceInfoData);
   #endregion

   private static IntPtr hDevInfo = (IntPtr)0;
   private static bool StateChange(int NewState, int SelectedItem, IntPtr hDevInfo)
   {

       SP_PROPCHANGE_PARAMS PropChangeParams;
       SP_DEVINFO_DATA DeviceInfoData;
       PropChangeParams = new SP_PROPCHANGE_PARAMS();
       PropChangeParams.Init();
       DeviceInfoData = new SP_DEVINFO_DATA();
       PropChangeParams.ClassInstallHeader.cbSize = Marshal.SizeOf(PropChangeParams.ClassInstallHeader);
       DeviceInfoData.cbSize = Marshal.SizeOf(DeviceInfoData);
       if (!SetupDiEnumDeviceInfo(hDevInfo, SelectedItem, ref DeviceInfoData))
           return false;
       PropChangeParams.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;
       PropChangeParams.Scope = DICS_FLAG_GLOBAL;
       PropChangeParams.StateChange = NewState;
       if (!SetupDiSetClassInstallParams(hDevInfo, ref DeviceInfoData, ref PropChangeParams.ClassInstallHeader, Marshal.SizeOf(PropChangeParams)))
           return false;
       if (!SetupDiCallClassInstaller(DIF_PROPERTYCHANGE, hDevInfo, ref DeviceInfoData))
           return false;
       PropChangeParams.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;
       PropChangeParams.Scope = DICS_FLAG_CONFIGSPECIFIC;
       PropChangeParams.StateChange = NewState;
       if (!SetupDiSetClassInstallParams(hDevInfo, ref DeviceInfoData, ref PropChangeParams.ClassInstallHeader, Marshal.SizeOf(PropChangeParams)))
           return false;
       if (!SetupDiCallClassInstaller(DIF_PROPERTYCHANGE, hDevInfo, ref DeviceInfoData))
           return false;
       return true;
   }    
   /// <summary>
   /// ネットワークを無効にします。
   /// </summary>
   /// <returns>bool:処理の成否</returns>
   public static bool DisableNetAdapter()
   {
       IntPtr hdi;
       bool res = true;
       hdi = SetupDiGetClassDevs(ref GUID_DEVCLASS_NET, (IntPtr)0, (IntPtr)0, DIGCF_PRESENT);
       if (hdi == (IntPtr)INVALID_HANDLE_VALUE)
           return false;
       res = StateChange(DICS_DISABLE, 0, hdi);
       SetupDiDestroyDeviceInfoList(hdi);
       System.Threading.Thread.Sleep(500);
       return res;
   }
   /// <summary>
   /// <para>ネットワーク接続を有効にします</para>
   /// </summary>
   /// <returns>bool:処理の成否</returns>
   public static bool EnableNetAdapter()
   {
       IntPtr hdi;
       Boolean res = true;
       hdi = SetupDiGetClassDevs(ref GUID_DEVCLASS_NET, (IntPtr)0, (IntPtr)0, DIGCF_PRESENT);
       if (hdi == (IntPtr)INVALID_HANDLE_VALUE)
           return false;
       res = StateChange(DICS_ENABLE, 0, hdi);
       SetupDiDestroyDeviceInfoList(hdi);
       System.Threading.Thread.Sleep(500);
       return res;
   }
}
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