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SetSystemPowerState (coredll)
coredll is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for SetSystemPowerState in other DLLs exists, click on Find References to the right.
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C# Signature:
[DllImport("coredll.dll", SetLastError=true)]
static extern int SetSystemPowerState(string psState, int StateFlags, int Options);
VB Signature:
Declare Function SetSystemPowerState Lib "Coredll" ( _
ByVal psState As String, _
ByVal StateFlags As Integer, _
ByVal Options As Integer) As Integer
User-Defined Types:
None.
Alternative Managed API:
Do you know one? Please contribute it!
Notes:
May be more effective at forcing the device off than holding it on.
Tips & Tricks:
Conversion table Win32 to .NET
This is a very handy table when you want to convert C++ to C# .NET using P/Invoke
Const POWER_STATE_ON As Integer = &H10000
Const POWER_STATE_OFF As Integer = &H20000
Const POWER_STATE_SUSPEND As Integer = &H200000
Const POWER_FORCE As Integer = 4096
Const POWER_STATE_RESET as Integer = &H800000 'this wil make the device soft reset! :)
Const POWER_STATE_RESET as Integer = 0x800000 'this wil make the device soft reset! :)
Public Sub ForcePower()
SetSystemPowerState(Nothing, POWER_STATE_ON, POWER_FORCE)
End Sub
Public Sub SoftReset()
SetSystemPowerState(Nothing, POWER_STATE_RESET, POWER_FORCE)
End Sub
Sample Code (C#):
const int POWER_STATE_ON = 0x00010000;
const int POWER_STATE_OFF = 0x00020000;
const int POWER_STATE_SUSPEND = 0x00200000;
const int POWER_FORCE = 4096;
const int POWER_FORCE As Integer = 4096;
const int POWER_STATE_RESET = 0x00800000;
public int ForcePower()
{
return SetSystemPowerState(null, POWER_STATE_ON, POWER_FORCE);
}
public int SoftReset()
{
// Though I guess this will never really return anything
return SetSystemPowerState(null, POWER_STATE_RESET, POWER_FORCE);
}
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
Click to read this page
6/25/2010 2:17:25 PM - -90.152.60.34
A HandleRef is essentially an IntPtr to a handle and a reference to the object the handle belongs to. Using HandleRef prevents the GC from collecting the object until the native method is done with it.
7/22/2009 9:41:44 AM - -212.251.139.186
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
Click to read this page
6/25/2010 2:17:25 PM - -90.152.60.34
Click to read this page
10/2/2011 2:35:57 AM - txzhgh-89.110.151.174
Click to read this page
10/2/2011 2:35:57 AM - txzhgh-89.110.151.174
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
Click to read this page
6/25/2010 2:17:25 PM - -90.152.60.34
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
Click to read this page
6/25/2010 2:17:25 PM - -90.152.60.34
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