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    [StructLayoutAttribute(LayoutKind.Sequential)]
    public struct IHU_TIMESTAMP
    {
        public int Seconds;
        public int Subsectonds;
    }
    [System.Runtime.InteropServices.DllImportAttribute("IHAPIDLLS.dll", EntryPoint = "api_ihuReadCurrentValue")]
    public static extern int api_ihuReadCurrentValue(
        int serverhandle,
        int number_of_tags, 
        IntPtr tagnames, 
        ref float tagvalues, 
        ref IHU_TIMESTAMP timestamps, 
        ref int tagerrs, 
        IntPtr retmessage);