private static bool IsActive(Guid id)
{
IntPtr pCurrentSchemeGuid = IntPtr.Zero;
PowerAPI.PowerGetActiveScheme(IntPtr.Zero, ref pCurrentSchemeGuid);
var currentSchemeGuid = (Guid)Marshal.PtrToStructure(pCurrentSchemeGuid, typeof(Guid));
return(currentSchemeGuid == id);
}
private static string ReadPowerName(Guid id)
{
uint sizeName = 1024;
IntPtr pSizeName = Marshal.AllocHGlobal((int)sizeName);
string powerName;
try
{
PowerAPI.PowerReadFriendlyName(IntPtr.Zero, ref id, IntPtr.Zero, IntPtr.Zero, pSizeName, ref sizeName);
powerName = Marshal.PtrToStringUni(pSizeName);
}
finally
{
Marshal.FreeHGlobal(pSizeName);
}
return(powerName);
}
public static IEnumerable <PowerProperty> GetAll()
{
var schemeGuid = Guid.Empty;
uint sizeSchemeGuid = (uint)Marshal.SizeOf(typeof(Guid));
uint schemeIndex = 0;
while (PowerAPI.PowerEnumerate(IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, (uint)PowerAPI.AccessFlags.ACCESS_SCHEME, schemeIndex, ref schemeGuid, ref sizeSchemeGuid) == 0)
{
string friendlyName = ReadPowerName(schemeGuid);
bool isActive = IsActive(schemeGuid);
yield return(new PowerProperty {
Id = schemeGuid, Name = friendlyName, IsActive = isActive
});
schemeIndex++;
}
}
public static void Active(Guid id)
{
PowerAPI.PowerSetActiveScheme(IntPtr.Zero, ref id);
}