static extern uint CallNtPowerInformation(
int InformationLevel,
IntPtr lpInputBuffer,
int nInputBufferSize,
out SYSTEM_POWER_INFORMATION spi,
int nOutputBufferSize
);
public static bool GetPowerInformation(out SYSTEM_POWER_INFORMATION value)
{
SYSTEM_POWER_INFORMATION spi = new SYSTEM_POWER_INFORMATION();
value = spi;
IntPtr pnt = Marshal.AllocHGlobal(Marshal.SizeOf(spi));
Marshal.StructureToPtr(spi, pnt, false);
uint retval = CallNtPowerInformation(
SystemPowerInformation,
IntPtr.Zero,
0,
pnt,
(uint)Marshal.SizeOf(spi)
);
var ret = retval == STATUS_SUCCESS;
if (ret)
{
spi = Marshal.PtrToStructure <SYSTEM_POWER_INFORMATION>(pnt);
value = spi;
}
return(ret);
}
public static int GetIdleTimeRemaining()
{
var info = new SYSTEM_POWER_INFORMATION();
int ret = GetSystemPowerInformation(SystemPowerInformation, IntPtr.Zero, 0, out info, Marshal.SizeOf(info));
if (ret != 0)
{
throw new System.ComponentModel.Win32Exception(ret);
}
return(info.TimeRemaining);
}
private static extern int GetSystemPowerInformation(int level, IntPtr inpbuf, int inpbuflen, out SYSTEM_POWER_INFORMATION info, int outbuflen);