/// <summary>
/// Apply a new thermal setting to the system.
/// </summary>
/// <param name="thermalSetting">Thermal setting to apply</param>
/// <returns>True if successful, false if not</returns>
public static bool SetThermalSetting(ThermalSetting thermalSetting)
{
if (thermalSetting != ThermalSetting.Error)
{
try
{
DellSmmBiosMessage message = new DellSmmBiosMessage
{
Class = ThermalModeClass,
Selector = ThermalModeSelector,
Result1 = DefaultResult1,
Parameter1 = 1,
Parameter2 = (uint)thermalSetting
};
return(ExecuteCommand(ref message));
}
catch (Exception)
{
return(false);
}
}
else
{
return(false);
}
}
/// <summary>
/// Get the current thermal setting for the system.
/// </summary>
/// <returns>Current thermal setting; ThermalSetting.Error on error</returns>
public static ThermalSetting GetThermalSetting()
{
try
{
DellSmmBiosMessage message = new DellSmmBiosMessage
{
Class = ThermalModeClass,
Selector = ThermalModeSelector,
Result1 = DefaultResult1
};
bool result = ExecuteCommand(ref message);
if (result)
{
return((ThermalSetting)message.Result3);
}
else
{
return(ThermalSetting.Error);
}
}
catch (Exception)
{
return(ThermalSetting.Error);
}
}
/// <summary>
/// Execute a command against the SMM BIOS via the ACPI/WMI interface.
/// </summary>
/// <param name="message">SMM BIOS message (a packaged-up command to be executed)</param>
/// <returns>True if successful, false if not; note that exceptions on error conditions can come back from this method as well</returns>
private static bool ExecuteCommand(ref DellSmmBiosMessage message)
{
byte[] bytes = StructToByteArray(message);
byte[] buffer = new byte[BufferLength];
Buffer.BlockCopy(bytes, 0, buffer, 0, bytes.Length);
bool result = ExecuteCommand(ref buffer);
message = ByteArrayToStruct(buffer);
return(result);
}
/// <summary>
/// Convert a SMM BIOS message struct to a byte array.
/// </summary>
/// <param name="message">SMM BIOS message struct</param>
/// <returns>Byte array</returns>
/// <seealso cref="https://stackoverflow.com/questions/3278827/how-to-convert-a-structure-to-a-byte-array-in-c"/>
private static byte[] StructToByteArray(DellSmmBiosMessage message)
{
int size = Marshal.SizeOf(message);
byte[] array = new byte[size];
IntPtr pointer = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(message, pointer, true);
Marshal.Copy(pointer, array, 0, size);
Marshal.FreeHGlobal(pointer);
return(array);
}
/// <summary>
/// Convert a byte array to a SMM BIOS message struct.
/// </summary>
/// <param name="array">Byte array</param>
/// <returns>SMM BIOS message struct</returns>
/// <seealso cref="https://stackoverflow.com/questions/3278827/how-to-convert-a-structure-to-a-byte-array-in-c"/>
private static DellSmmBiosMessage ByteArrayToStruct(byte[] array)
{
DellSmmBiosMessage message = new DellSmmBiosMessage();
int size = Marshal.SizeOf(message);
IntPtr pointer = Marshal.AllocHGlobal(size);
Marshal.Copy(array, 0, pointer, size);
message = (DellSmmBiosMessage)Marshal.PtrToStructure(pointer, message.GetType());
Marshal.FreeHGlobal(pointer);
return(message);
}