@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: Indicates the specific power information to be set or retrieved. It used as a parameter in CallNtPowerInformation function. !!!!C# Signature: /// <summary> /// Indicates the specific power information to be set or retrieved. It used as a parameter in CallNtPowerInformation function. /// </summary> public enum POWER_INFORMATION_LEVEL : Int32 { /// <summary> /// <para> The lpInBuffer parameter must be NULL; otherwise, the function returns ERROR_INVALID_PARAMETER.</para> ///The lpOutputBuffer buffer receives a ULONGLONG that specifies the interrupt-time count, in 100-nanosecond units, at the last system sleep time. /// </summary> LastSleepTime = 15, /// <summary> /// <para> The lpInBuffer parameter must be NULL; otherwise, the function returns ERROR_INVALID_PARAMETER.</para> /// The lpOutputBuffer buffer receives a ULONGLONG that specifies the interrupt-time count, in 100-nanosecond units, at the last system wake time. /// </summary> LastWakeTime = 14, /// <summary> /// <para> The lpInBuffer parameter must be NULL; otherwise the function returns ERROR_INVALID_PARAMETER.</para> /// The lpOutputBuffer buffer receives one PROCESSOR_POWER_INFORMATION structure for each processor that is installed on the system. Use the GetSystemInfo function to retrieve the number of processors. /// </summary> ProcessorInformation = 11, /// <summary> /// <para> The lpInBuffer parameter must be NULL; otherwise, the function returns ERROR_INVALID_PARAMETER.</para> /// The lpOutputBuffer buffer receives a SYSTEM_BATTERY_STATE structure containing information about the current system battery. /// </summary> SystemBatteryState = 5, /// <summary> /// <para> The lpInBuffer parameter must be NULL; otherwise the function returns ERROR_INVALID_PARAMETER.</para> /// The lpOutputBuffer buffer receives a ULONG value containing the system execution state buffer. /// <para> This value may contain any combination of the following values: ES_SYSTEM_REQUIRED, ES_DISPLAY_REQUIRED, or ES_USER_PRESENT.</para> /// For more information, see the SetThreadExecutionState function. /// </summary> SystemExecutionState = 16, /// <summary> /// <para> The lpInBuffer parameter must be NULL, otherwise, the function returns ERROR_INVALID_PARAMETER.</para> /// The lpOutputBuffer buffer receives a SYSTEM_POWER_CAPABILITIES structure containing the current system power capabilities. /// <para> This information represents the currently supported power capabilities. It may change as drivers are installed in the system. /// For example, installation of legacy device drivers that do not support power management disables all system sleep states.</para> /// </summary> SystemPowerCapabilities = 4, /// <summary> /// <para> The lpInBuffer parameter must be NULL; otherwise, the function returns ERROR_INVALID_PARAMETER.</para> /// The lpOutputBuffer buffer receives a SYSTEM_POWER_INFORMATION structure. /// <para> Applications can use this level to retrieve information about the idleness of the system.</para> /// </summary> SystemPowerInformation = 12, /// <summary> /// <para> If lpInBuffer is not NULL, the function applies the SYSTEM_POWER_POLICY values passed in lpInBuffer to the current system power policy used while the system is running on AC (utility) power.</para> /// The lpOutputBuffer buffer receives a SYSTEM_POWER_POLICY structure containing the current system power policy used while the system is running on AC (utility) power. /// </summary> SystemPowerPolicyAc = 0, /// <summary> /// <para> The lpInBuffer parameter must be NULL; otherwise, the function returns ERROR_INVALID_PARAMETER.</para> /// The lpOutputBuffer buffer receives a SYSTEM_POWER_POLICY structure containing the current system power policy used while the system is running on AC (utility) power. /// </summary> SystemPowerPolicyCurrent = 8, /// <summary> /// <para> If lpInBuffer is not NULL, the function applies the SYSTEM_POWER_POLICY values passed in lpInBuffer to the current system power policy used while the system is running on battery power.</para> /// The lpOutputBuffer buffer receives a SYSTEM_POWER_POLICY structure containing the current system power policy used while the system is running on battery power. /// </summary> SystemPowerPolicyDc = 1, /// <summary> /// <para> If lpInBuffer is not NULL and the current user has sufficient privileges, the function commits or decommits the storage required to hold the hibernation image on the boot volume.</para> /// The lpInBuffer parameter must point to a BOOLEAN value indicating the desired request. If the value is TRUE, the hibernation file is reserved; if the value is FALSE, the hibernation file is removed. /// </summary> SystemReserveHiberFile = 10 } Documentation: POWER_INFORMATION_LEVEL@msdn on MSDN
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