C#_interop_Nim3

*** C# ***

    public struct NimT
    {
      public uint Val1;
      public uint Val2;
      public uint Val2;
    }

    [Dllimport("DllPath", CallingConvention = CallingConvention.Cdecl)]
    public static extern void populateArraySruct(uint length, NimT** ArrayStructs)


    public static unsafe List<NimT> PopulateLstPackNim(int ArrL)
    {
        NimT* PackUArrOut = null;
        List<NimT> RtPackLst = new List<NimT>(ArrL);
        populateArraySruct(ArrL, &PackUArrOut);
        NimT* CurrentPack = PackUArrOut;
        for (int i = 0; i < ArrL; i++, CurrentPack++)
        {
            RtPackLst.Add(new NimT() {Val1 = CurrentPack->Val1, Val2 = CurrentPack->Val2, Val3 = CurrentPack->Val3 });
        }
        return RtPackLst;
    }


**NIM**
# feel free to change uint32 to int / int32 i have tried to be more specific in the type convention

type
  ExportNimTARRAY = seq[ExportNimT]
  ExportNimT = object
    Val1: uint32
    Val2: uint32
    Val3: uint32

proc populateArraySruct(parSze: int, PackArrINOUT: var ExportNimTARRAY) {.exportc,dynlib.} =
  PackArrINOUT.newSeq(parSze)
  var
    tmp1: uint32
    tmp2: uint32
    tmp3: uint32
  for i, curDataPack in PackArrINOUT.mpairs:
    tmp1 = (uint32 1) * (uint32 i)
    tmp2 = (uint32 10) * (uint32 i)
    tmp3 = (uint32 11) * (uint32 i)
    curDataPack = ExportNimT (Val1:tmp1, Val2: tmp2, Val3: tmp3)