Marshal safearray of struct inside struct

Question

I have the following code in C++ which I need to be able to call from C#:

struct Inner
{
 double data1;
 double data2;
};

struct Outer
{
 double data3;
 SAF         


        

Answer 1

Did you try this?

  [StructLayoutAttribute (LayoutKind.Sequential)]
  public struct Outer
  {
     public double data3;
     [MarshalAsAttribute (UnmanagedType.SafeArray, SafeArrayUserDefinedSubType=typeof(Inner))]
     public Inner [] innerData;
  }

Answer 2

It looks as if the attribute declaration is not correct as its refusing to compile...

[StructLayoutAttribute(LayoutKind.Sequential)]
        public struct Outer
        {
            public double data3;
            [MarshalAsAttribute(UnmanagedType.SafeArray, SafeArraySubType=VarEnum.VT_SAFEARRAY)]
            public Inner[] innerData;
        }

Hope this helps, Best regards, Tom.