public static extern UInt32 PdhCollectQueryData(PdhQueryHandle phQuery);
public static extern UInt32 PdhOpenQueryH(PdhLogHandle hDataSource, IntPtr dwUserData, out PdhQueryHandle phQuery);
public static extern UInt32 PdhAddCounter(PdhQueryHandle hQuery, string szFullCounterPath, IntPtr dwUserData, out PdhCounterHandle phCounter);
public static extern UInt32 PdhOpenQuery(string szDataSource, IntPtr dwUserData, out PdhQueryHandle phQuery);