public static extern uint CallNtPowerInformation( int InformationLevel, IntPtr lpInputBuffer, int nInputBufferSize, out SYSTEM_POWER_CAPABILITIES spi, int nOutputBufferSize );
private static extern bool GetPwrCapabilities(out SYSTEM_POWER_CAPABILITIES systemPowerCapabilites);
static extern bool GetPwrCapabilities(out SYSTEM_POWER_CAPABILITIES systemPowerCapabilites);
public static extern bool GetPwrCapabilities(out SYSTEM_POWER_CAPABILITIES lpspc);
static extern bool GetPwrCapabilities(ref SYSTEM_POWER_CAPABILITIES lpSystemPowerCapabilities);