微软.net精简框架常见问题及回答(中文版)(22)

王朝c#·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

Verify that the DLL being imported is not dependant upon other DLLs. A missing dependant DLL will result in the MissingMethodException. For the latest Microsoft eMbedded Visual Tools and SDK downloads, visit the MSDN Mobile and Embedded Developer Center "Products & Updates" download page at:

http://msdn.microsoft.com/mobility/downloads/updates/default.aspx

6.16. How do I set the system time?

You can set the system time by P/Invoking the SetSystemTime function. //C#

using System.Runtime.InteropServices;

public struct SYSTEMTIME

{

public ushort wYear;

public ushort wMonth;

public ushort wDayOfWeek;

public ushort wDay;

public ushort wHour;

public ushort wMinute;

public ushort wSecond;

public ushort wMilliseconds;

}

[DllImport("coredll.dll")]

public extern static void GetSystemTime(ref SYSTEMTIME lpSystemTime);

[DllImport("coredll.dll")]

public extern static uint SetSystemTime(ref SYSTEMTIME lpSystemTime);

// Set the clock ahead one hour

SYSTEMTIME st = new SYSTEMTIME();

GetSystemTime(ref st);

st.wHour = (ushort)(st.wHour + 1 % 24);

SetSystemTime(ref st);

'VB

Imports System.Runtime.InteropServices

Public Structure SYSTEMTIME

Public wYear As UInt16

Public wMonth As UInt16

Public wDayOfWeek As UInt16

Public wDay As UInt16

Public wHour As UInt16

Public wMinute As UInt16

Public wSecond As UInt16

Public wMilliseconds As UInt16

End Structure

<DllImport("coredll.dll")> _

Public Shared Sub GetSystemTime(ByRef lpSystemTime As SYSTEMTIME)

End Sub

<DllImport("coredll.dll")> _

Public Shared Function SetSystemTime(ByRef lpSystemTime As SYSTEMTIME) As UInt32

End Function

'Set the clock ahead one hour

Dim st As New SYSTEMTIME

GetSystemTime(st)

st.wHour = Convert.ToUInt16(((Convert.ToInt32(st.wHour) + 1)) Mod 24)

SetSystemTime(st)

6.17. How do I programmatically soft reset the device?

The device can be soft reset through P/Invoking of the KernelIoControl function, as demonstrated in the code below. For more information on how to use the function and extend the functionality of this sample, refer to Visual Studio .NET Help.

Note: On Smartphone devices, this will only work if you are signed with a privileged certificate. //C#

using System.Runtime.InteropServices;

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

);

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);

}

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