How to marshal nested array from C# to C++?

Question

I am making a DLL in C++ to use in C#. I need to transfer a array list from C# to C++ vector. The array will look like

[][]
[][]
.
.

I referred to this answer for marshaling List to vector link. It worked for one dimension array. But for list of array which gives a nested array gives an error "There is no marshaling support for nested arrays".

My code looks like this on C# end,

    [DllImport("./x64/Debug/Test.dll")]
    public static extern void analysis([MarshalAs(UnmanagedType.LPArray)] double[][] values, int len);

    static void Main(string[] args)
    {
        List<double[]> lst = new List<double[]>();
        lst.Add(new double[] { 1.2, 1.3 });
        lst.Add(new double[] { 2.3, 2.4 });
        lst.Add(new double[] { 3.4, 3.5 });

        analysis(lst.ToArray(), lst.Count);

    }

And on C++ end,

extern "C" __declspec(dllexport) void __cdecl analysis(double* values[], int len)
{
    using namespace std;

    vector<array<double,2>> ind(values, values + len);

    int n = ind.size();

    for (int i = 0; i < n; i++)
    {
        cout << ind[i][0] << ind[i][1] << endl;
    }
}

Also, I am not sure I wrote the vector constructor correctly. I would very much appreciate some help.

franta96 · Accepted Answer · 2021-09-14 20:33:28Z

1

Try use json. In c#:

string jsonString = JsonSerializer.Serialize(lst);

Then in C++ unserialize.

answered Sep 14, 2021 at 20:33

franta96

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