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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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Summary
Controls the overall device power state

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:

Please add some!

Sample Code (VB):

    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 = 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 As Integer = 4096;
    const int POWER_STATE_RESET = 0x00800000;

    public int ForcePower()
    {
            retrun 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);
    }

Documentation

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