Pass struct or string array from C++ to C# using COM

I have a COM component (in C#) that has the following interface:

namespace InterOp
{
    [StructLayout(LayoutKind.Sequential)]
    public struct MyStruct
    {
        [MarshalAs(UnmanagedType.BStr)]
        public string name;
        [MarshalAs(UnmanagedType.BStr)]
        public string surname;
        public int age;
    }

    public interface ITest
    {        
        void SetStringArray(string[] array);
        void SetStructArray(MyStruct[] array);
    }

    public class Test : ITest
    {
        // string arrays
        public void SetStringArray(string[] array)
        {
            for(int i = 0; i < array.Length; i++)
                MessageBox.Show(array[i]); // just do something with the array values
        }

        // struct arrays
        public void SetStructArray(MyStruct[] array)
        {
            for (int i = 0; i < array.Length; i++)
                MessageBox.Show(array[i].name + ", " + array[i].surname + " (" + array[i].age.ToString() + ")");// just do something with the array values
        }
    }
}

Now I want to pass data from C++ to that COM object. I initialized the interface like this:

HRESULT hr = CoInitialize(NULL);
ITest* pTest = NULL;
hr = CoCreateInstance(__uuidof(Test), NULL, CLSCTX_INPROC_SERVER, __uuidof(ITest), (void**)&pTest);

But I can't pass a reference to my array to that method, as it requires a SAFEARRAY* array. I was able to create SAFEARRAYs with arrays with fixed size elements like double, int, char arrays, and it works fine using something like this:

SAFEARRAY* data = SafeArrayCreate(VT_R8, 1, &bound); //8-Byte-Real, 1 dimension

Of course, for my user-defined struct there is no "VT_something", so I don't know how to create a SAFEARRAY to solve this. I tried VT_DISPATCH and VT_BSTR without success.

The actual method to pass the data is this one:

bool SetStructArrayEx(MyInterOp::MyStruct* array, int arraySize, ITest* comObjectInterface)
{
    bool retVal = false;

    // Create the safearray environment
    SAFEARRAYBOUND bound;
    bound.lLbound = 0;
    bound.cElements = arraySize;

    // Init the safearray
    SAFEARRAY* data = SafeArrayCreate(VT_DISPATCH, 1, &bound); 

    // access the safearray data and copy the original data to it
    MyInterOp::MyStruct HUGEP* temp;
    HRESULT hr = SafeArrayAccessData(data, (void HUGEP* FAR*)&temp);
    if(SUCCEEDED(hr))
    {
        // finally copy the data
        for(int i=0; i<arraySize; ++i)
            *temp++ = array[i];

        comObjectInterface->SetStructArray(data);
        SafeArrayUnaccessData(data);

        retVal = true;
    }

    SafeArrayDestroy(data);

    return retVal;
}

...and this does not work (Exception in Kernel32.dll when calling SetStructArray).

Any ideas where I'm wrong? Or what would work?

Thanks, Markus