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Comment : obtenir l'ID et le nom du périphérique

  • Article

Mise à jour : novembre 2007

Pour obtenir le nom du périphérique, utilisez la propriété Dns.GetHostName. Un nom par défaut typique est « PocketPC ».

Exemple

Cet exemple affiche l'ID et le nom du périphérique dans des messages lors du chargement du formulaire.

Pour obtenir l'ID du périphérique, ou numéro de série, vous devez utiliser l'appel de code non managé pour accéder à la fonction KernelIoControl de Windows CE native.

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());
            }
        }
    }
}

Compilation du code

Cet exemple nécessite des références aux espaces de noms suivants :

Programmation fiable

Le tableau suivant répertorie les paramètres de la fonction KernelIoControl native. Tous sont en 32 bits.

Paramètre

Type Win32

Type managé

Valeur typique

dwIoControlCode

DWORD

Int32

IOCTL_HAL_GET_DEVICEID

lpInBuf

LPVOID

IntPtr

IntPtr.Zero (aucune donnée d'entrée requise)

nInBufSize

DWORD

Int32

0 (aucune donnée d'entrée requise)

lpOutBuf

LPVOID*

Int32

Un tableau Byte de 20 éléments (20 octets représentent la taille de la structure DEVICE_ID)

nOutBufSize

DWORD

Int32

20

lpBytesReturned

LPWORD

refInt32

0

Le paramètre lpOutBuf a la structure suivante :

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;
}

Valeurs de retour et gestion des erreurs

La fonction KernelIoControl retourne true si l'ID de périphérique a été copié vers la mémoire tampon de sortie ; sinon, elle retourne false. Si KernelIoControl échoue, appelez la méthode GetLastWin32Error managée pour obtenir le code d'erreur Win32. Le code d'erreur est probablement l'un des suivants :

  • ERROR_NOT_SUPPORTED - Indique que le périphérique n'implémente pas le code de contrôle IOCTL_HAL_GET_DEVICEID.

  • ERROR_INSUFFICIENT_BUFFER - Indique que la mémoire tampon de sortie n'était pas assez grande pour contenir l'ID de périphérique. Le nombre requis d'octets, spécifié par dwSize dans la structure DEVICE_ID, est retourné dans les quatre premiers octets de la mémoire tampon de sortie. Si cette erreur se produit, réaffectez la mémoire tampon de sortie à la taille spécifiée par dwSize et appelez à nouveau KernelIoControl.

Voir aussi

Tâches

Comment : obtenir la mémoire d'un périphérique

Autres ressources

Interopérabilité dans le .NET Compact Framework