获取设备 ID 和名称
更新：2007 年 11 月
要获取设备的名称，请使用 Dns.GetHostName 属性。通常情况下，默认名称为“PocketPC”。
本示例在加载窗体时在消息框中显示设备的 ID 和名称。
要获取设备 ID 或序列号，您必须使用平台调用来访问本机 Windows CE KernelIoControl 函数。
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());
}
}
}
}
下表列出了本机 KernelIoControl 函数参数。所有参数均是 32 位。
lpOutBuf 参数具有以下结构：
struct DEVICE_ID
{
int dwSize;
int dwPresetIDOffset;
int dwPresetIDBytes;
int dwPlatformIDOffset;
int dwPlatformIDBytes;
}
返回值和错误处理
如果将设备 ID 复制到了输出缓冲区，KernelIoControl 函数返回 true；否则，它会返回 false。如果 KernelIoControl 失败，请调用托管GetLastWin32Error 方法以获取 Win32 错误代码。错误代码可能是下列代码中的任意一种：
-
ERROR_NOT_SUPPORTED - 指示设备不执行 IOCTL_HAL_GET_DEVICEID 控制代码。
-
ERROR_INSUFFICIENT_BUFFER - 指示输出缓冲区不够大，无法容纳设备 ID。由 DEVICE_ID 结构中的 dwSize 指定的所需字节数在输出缓冲区的前四个字节中返回。如果发生此错误，请将输出缓冲区重新分配为 dwSize 指定的大小，然后再次调用 KernelIoControl。
