How to: Reset the Device
To reset the device, use platform invoke to call the native KernelIoControl function.
Example
This code example defines the following:
Platform invoke declarations for the native functions in Windows CE.
A method named
ResetDevicethat displays a confirmation message box. If the user responds yes, theResetPocktPCmethod resets the device.
Private Const FILE_DEVICE_HAL As Integer = &H101
Private Const METHOD_BUFFERED As Integer = 0
Private Const FILE_ANY_ACCESS As Integer = 0
Private Function CTL_CODE( _
ByVal DeviceType As Integer, _
ByVal Func As Integer, _
ByVal Method As Integer, _
ByVal Access As Integer) As Integer
Return (DeviceType << 16) Or (Access << 14) Or (Func << 2) Or Method
End Function
Declare Function KernelIoControl Lib "CoreDll.dll" _
(ByVal dwIoControlCode As Integer, _
ByVal lpInBuf As IntPtr, _
ByVal nInBufSize As Integer, _
ByVal lpOutBuf As IntPtr, _
ByVal nOutBufSize As Integer, _
ByRef lpBytesReturned As Integer _
) As Integer
Private Function ResetPocketPC() As Integer
Dim bytesReturned As Integer = 0
Dim IOCTL_HAL_REBOOT As Integer = CTL_CODE(FILE_DEVICE_HAL, _
15, METHOD_BUFFERED, FILE_ANY_ACCESS)
Return KernelIoControl(IOCTL_HAL_REBOOT, IntPtr.Zero, 0, _
IntPtr.Zero, 0, bytesReturned)
End Function
Private Sub ResetDevice()
Dim msg As String
Dim title As String
Dim style As MsgBoxStyle
Dim response As MsgBoxResult
msg = "Are you sure you want to reset the device?"
style = MsgBoxStyle.DefaultButton2 Or _
MsgBoxStyle.Question Or MsgBoxStyle.YesNo
title = "Device Reset"
response = MsgBox(msg, style, title)
If response = MsgBoxResult.Yes Then ' User chose Yes.
ResetPocketPC()
End If
End Sub
public const uint FILE_DEVICE_HAL = 0x00000101;
public const uint METHOD_BUFFERED = 0;
public const uint FILE_ANY_ACCESS = 0;
public uint CTL_CODE(uint DeviceType, uint Function, uint Method, uint Access)
{
return ((DeviceType << 16) | (Access << 14) | (Function << 2) | Method);
}
[DllImport("Coredll.dll")]
public extern static uint KernelIoControl
(
uint dwIoControlCode,
IntPtr lpInBuf,
uint nInBufSize,
IntPtr lpOutBuf,
uint nOutBufSize,
ref uint lpBytesReturned
);
private uint ResetPocketPC()
{
uint bytesReturned = 0;
uint IOCTL_HAL_REBOOT = CTL_CODE(FILE_DEVICE_HAL, 15,
METHOD_BUFFERED, FILE_ANY_ACCESS);
return KernelIoControl(IOCTL_HAL_REBOOT, IntPtr.Zero, 0,
IntPtr.Zero, 0, ref bytesReturned);
}
private void ResetDevice()
{
DialogResult r = MessageBox.Show
(
"Are you sure you want to reset?",
"Test",
MessageBoxButtons.YesNo,
MessageBoxIcon.Question,
MessageBoxDefaultButton.Button2
);
if (r == DialogResult.Yes)
{
ResetPocketPC();
}
}
Compiling the Code
This example requires references to the following namespaces: