方法 : デバイスの ID および名前を取得する

更新 : 2007 年 11 月

デバイスの名前を取得するには、Dns.GetHostName プロパティを使用します。通常の既定の名前は、"PocketPC" です。

使用例

この例では、フォームの読み込み時に、デバイスの ID と名前をメッセージ ボックスに表示します。

デバイス ID またはシリアル番号を取得するには、プラットフォーム呼び出しを使用して、ネイティブの Windows CE KernelIoControl 関数にアクセスする必要があります。

Imports System
Imports System.Drawing
Imports System.ComponentModel
Imports System.Diagnostics
Imports System.Windows.Forms
Imports System.Runtime.InteropServices
Imports System.Text
Imports Microsoft.VisualBasic

Public Class DeviceID
    Inherits System.Windows.Forms.Form

    Declare Function KernelIoControl Lib "CoreDll.dll" _
        (ByVal dwIoControlCode As Int32, _
        ByVal lpInBuf As IntPtr, _
        ByVal nInBufSize As Int32, _
        ByVal lpOutBuf() As Byte, _
        ByVal nOutBufSize As Int32, _
        ByRef lpBytesReturned As Int32) As Boolean

    Public Sub New()

        Me.Text = "DeviceID"

        ' Display OK close button.
        Me.MinimizeBox = False

    End Sub

    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        MyBase.Dispose(disposing)
    End Sub

    Shared Sub Main()
        Application.Run(New DeviceID)
    End Sub 

    Private Shared METHOD_BUFFERED As Int32 = 0
    Private Shared FILE_ANY_ACCESS As Int32 = 0
    Private Shared FILE_DEVICE_HAL As Int32 = &H101

    Private Const ERROR_NOT_SUPPORTED As Int32 = &H32
    Private Const ERROR_INSUFFICIENT_BUFFER As Int32 = &H7A

    Private Shared IOCTL_HAL_GET_DEVICEID As Int32 = _
        (&H10000 * FILE_DEVICE_HAL) Or (&H4000 * FILE_ANY_ACCESS) _
        Or (&H4 * 21) Or METHOD_BUFFERED

    Private Shared Function GetDeviceID() As String

        ' Initialize the output buffer to the size of a 
        ' Win32 DEVICE_ID structure 
        Dim outbuff(19) As Byte
        Dim dwOutBytes As Int32
        Dim done As Boolean = False

        Dim nBuffSize As Int32 = outbuff.Length

        ' Set DEVICEID.dwSize to size of buffer.  Some platforms look at
        ' this field rather than the nOutBufSize param of KernelIoControl
        ' when determining if the buffer is large enough.
        BitConverter.GetBytes(nBuffSize).CopyTo(outbuff, 0)
        dwOutBytes = 0

        ' Loop until the device ID is retrieved or an error occurs.
        While Not done
            If KernelIoControl(IOCTL_HAL_GET_DEVICEID, IntPtr.Zero, _
                0, outbuff, nBuffSize, dwOutBytes) Then
                done = True
            Else
                Dim errnum As Integer = Marshal.GetLastWin32Error()
                Select Case errnum
                    Case ERROR_NOT_SUPPORTED
                        Throw New NotSupportedException( _
                            "IOCTL_HAL_GET_DEVICEID is not supported on this device", _
                            New Win32Exception(errnum))

                    Case ERROR_INSUFFICIENT_BUFFER

                        ' The buffer is not big enough for the data.  The
                        ' required size is in the first 4 bytes of the output 
                        ' buffer (DEVICE_ID.dwSize).
                        nBuffSize = BitConverter.ToInt32(outbuff, 0)
                        outbuff = New Byte(nBuffSize) {}

                        ' Set DEVICEID.dwSize to size of buffer.  Some
                        ' platforms look at this field rather than the
                        ' nOutBufSize param of KernelIoControl when
                        ' determining if the buffer is large enough.
                        BitConverter.GetBytes(nBuffSize).CopyTo(outbuff, 0)

                    Case Else
                        Throw New Win32Exception(errnum, "Unexpected error")
                End Select
            End If
        End While

        ' Copy the elements of the DEVICE_ID structure.
        Dim dwPresetIDOffset As Int32 = BitConverter.ToInt32(outbuff, &H4)
        Dim dwPresetIDSize As Int32 = BitConverter.ToInt32(outbuff, &H8)
        Dim dwPlatformIDOffset As Int32 = BitConverter.ToInt32(outbuff, &HC)
        Dim dwPlatformIDSize As Int32 = BitConverter.ToInt32(outbuff, &H10)
        Dim sb As New StringBuilder
        Dim i As Integer

        For i = dwPresetIDOffset To (dwPresetIDOffset + dwPresetIDSize) - 1
            sb.Append(String.Format("{0:X2}", outbuff(i)))
        Next i

        sb.Append("-")

        For i = dwPlatformIDOffset To (dwPlatformIDOffset + dwPlatformIDSize) - 1
            sb.Append(String.Format("{0:X2}", outbuff(i)))
        Next i

        Return sb.ToString()
    End Function

    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Try
            ' Show the device ID.
            Dim deviceID As String = GetDeviceID()
            MessageBox.Show("Device ID: " + deviceID)

            ' Show the device name.
            Dim deviceName As String = System.Net.Dns.GetHostName()
            MessageBox.Show("Device Name: " & deviceName)

        Catch ex As Exception
            MessageBox.Show(ex.Message.ToString())
        End Try
    End Sub
End Class

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Text;

namespace DeviceID
{
    /// <summary>
    /// Summary description for DeviceID.
    /// </summary>
    public class DeviceID : System.Windows.Forms.Form
    {

    public DeviceID()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            // 
            // DeviceID
            // 
            this.Text = "DeviceID";
            this.Load += new System.EventHandler(this.DeviceID_Load);

        }
        static void Main() 
        {
            Application.Run(new DeviceID());
        }
        #endregion

        private static Int32 METHOD_BUFFERED = 0;
        private static Int32 FILE_ANY_ACCESS = 0;
        private static Int32 FILE_DEVICE_HAL = 0x00000101;

        private const Int32 ERROR_NOT_SUPPORTED = 0x32;
        private const Int32 ERROR_INSUFFICIENT_BUFFER = 0x7A;

        private static Int32 IOCTL_HAL_GET_DEVICEID = 
            ((FILE_DEVICE_HAL) << 16) | ((FILE_ANY_ACCESS) << 14) 
            | ((21) << 2) | (METHOD_BUFFERED);

        [DllImport("coredll.dll", SetLastError=true)]
        private static extern bool KernelIoControl(Int32 dwIoControlCode, 
            IntPtr lpInBuf, Int32 nInBufSize, byte[] lpOutBuf, 
            Int32 nOutBufSize, ref Int32 lpBytesReturned);

        private static string GetDeviceID()
        {
            // Initialize the output buffer to the size of a 
            // Win32 DEVICE_ID structure.
            byte[] outbuff = new byte[20];
            Int32  dwOutBytes;
            bool done = false;

            Int32 nBuffSize = outbuff.Length;

            // Set DEVICEID.dwSize to size of buffer.  Some platforms look at
            // this field rather than the nOutBufSize param of KernelIoControl
            // when determining if the buffer is large enough.
            BitConverter.GetBytes(nBuffSize).CopyTo(outbuff, 0);  
            dwOutBytes = 0;

            // Loop until the device ID is retrieved or an error occurs.
            while (! done)
            {
                if (KernelIoControl(IOCTL_HAL_GET_DEVICEID, IntPtr.Zero, 
                    0, outbuff, nBuffSize, ref dwOutBytes))
                {
                    done = true;
                }
                else
                {
                    int error = Marshal.GetLastWin32Error();
                    switch (error)
                    {
                    case ERROR_NOT_SUPPORTED:
                        throw new NotSupportedException(
                            "IOCTL_HAL_GET_DEVICEID is not supported on this device",
                            new Win32Exception(error));

                    case ERROR_INSUFFICIENT_BUFFER:

                        // The buffer is not big enough for the data.  The
                        // required size is in the first 4 bytes of the output
                        // buffer (DEVICE_ID.dwSize).
                        nBuffSize = BitConverter.ToInt32(outbuff, 0);
                        outbuff = new byte[nBuffSize];

                        // Set DEVICEID.dwSize to size of buffer.  Some
                        // platforms look at this field rather than the
                        // nOutBufSize param of KernelIoControl when
                        // determining if the buffer is large enough.
                        BitConverter.GetBytes(nBuffSize).CopyTo(outbuff, 0);
                        break;

                    default:
                        throw new Win32Exception(error, "Unexpected error");
                    }
                }
            }

            // Copy the elements of the DEVICE_ID structure.
            Int32 dwPresetIDOffset = BitConverter.ToInt32(outbuff, 0x4);
            Int32 dwPresetIDSize = BitConverter.ToInt32(outbuff, 0x8);
            Int32 dwPlatformIDOffset = BitConverter.ToInt32(outbuff, 0xc);
            Int32 dwPlatformIDSize = BitConverter.ToInt32(outbuff, 0x10);
            StringBuilder sb = new StringBuilder();

            for (int i = dwPresetIDOffset; 
                i < dwPresetIDOffset + dwPresetIDSize; i++)
            {
                sb.Append(String.Format("{0:X2}", outbuff[i]));
            }

            sb.Append("-");

            for (int i = dwPlatformIDOffset; 
                i < dwPlatformIDOffset + dwPlatformIDSize; i ++ )  
            {
                sb.Append( String.Format("{0:X2}", outbuff[i]));
            }
            return sb.ToString();
        }

        private void DeviceID_Load(object sender, System.EventArgs e)
        {
            try 
            {
                // Show the device ID.
                string strDeviceID = GetDeviceID();
                MessageBox.Show("Device ID: " + strDeviceID);

                // Show the device name.
                string deviceName = System.Net.Dns.GetHostName();
                MessageBox.Show("Device Name: " + deviceName);
            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }
        }
    }
}

コードのコンパイル方法

この例は、次の名前空間への参照を必要とします。

• System

• System.ComponentModel

• System.Runtime.InteropServices

• System.Text

• System.Windows.Forms

堅牢性の高いプログラム

ネイティブ KernelIoControl 関数のパラメータの一覧を次の表に示します。すべて 32 ビットです。

lpOutBuf パラメータは次の構造で指定します。

Structure DEVICE_ID
    Private dwSize As Integer
    Private dwPresetIDOffset As Integer
    Private dwPresetIDBytes As Integer
    Private dwPlatformIDOffset As Integer
    Private dwPlatformIDBytes As Integer
End Structure

struct DEVICE_ID
{
    int dwSize;
    int dwPresetIDOffset;
    int dwPresetIDBytes;
    int dwPlatformIDOffset;
    int dwPlatformIDBytes;
}

戻り値とエラー処理

KernelIoControl 関数は、デバイス ID が出力バッファにコピーされた場合は true を返します。それ以外の場合は、false を返します。KernelIoControl に失敗すると、GetLastWin32Error マネージ メソッドが呼び出されて、Win32 エラー コードが取得されます。エラー コードは、次のどちらかになる可能性があります。

• ERROR_NOT_SUPPORTED - デバイスに IOCTL_HAL_GET_DEVICEID 制御コードが実装されていないことを示します。

• ERROR_INSUFFICIENT_BUFFER - 出力バッファがデバイス ID を保持するのに十分な大きさではなかったことを示します。必要なバイト数は DEVICE_ID 構造体の dwSize で指定されますが、その値が出力バッファの先頭 4 バイトで返されます。このエラーが発生する場合は、dwSize で指定されるサイズに出力バッファを再割り当てし、もう一度 KernelIoControl を呼び出します。

参照

処理手順

方法 : デバイスのメモリを取得する

その他の技術情報

.NET Compact Framework の相互運用性