C#

[StructLayout(LayoutKind.Explicit)]
public struct myUnion
{
  [FieldOffset(0)] string FieldA;
  [FieldOffset(0)] bool FieldB;
  [FieldOffset(4)] int FieldC;
  [FieldOffset(4)] long FieldD;
  [FieldOffset(12)] int Foo;
  [FieldOffset(12)] char Bar;
  [FieldOffset(12)] float Baz;
}

HRESULT GetItems([in] BSTR bstrLocation, [out] SAFEARRAY(VARIANT)* pItems);

[ComImport]
[Guid("73EB4AF8-BE9C-4b49-B3A4-24F4FF657B26")]
public interface IMyStorage  
{
  [DispId(2)]
  void GetItems( [In, MarshalAs( UnmanagedType.BStr )] String bstrLocation, 
         [Out, MarshalAs( UnmanagedType.SafeArray, SafeArraySubType = VarEnum.VT_VARIANT )] out Object[] Items );

...
}

string[] MyString = {"Hello", "and", "welcome", "to", "my" , "world!"};

// array ByRef
int[] array2 = new int[ 10 ];
int size = array2.Length;

IntPtr buffer = Marshal.AllocCoTaskMem( Marshal.SizeOf( size )
   * array2.Length ); // or Marshal.AllocHGlobal (COM or not)
Marshal.Copy( array2, 0, buffer, array2.Length );

int sum2 = LibWrap.TestRefArrayOfInts( ref buffer, ref size ); // replace this with your function replaceing arrays with IntPtr

if( size > 0 )
{
   int[] arrayRes = new int[ size ];
   Marshal.Copy( buffer, arrayRes, 0, size );
   Marshal.FreeCoTaskMem( buffer ); //or Marshal.FreeHGlobal
}

ArrayList tags = new ArrayList();
do 
{
  string tag = Marshal.PtrToStringUni(ptag); 
  // ptag is pointer to string[], make sure about unicode/ansi, i assume unicode
  if (tag == "") break;
  else 
  {
    tags.Add(tag);
    ptag = new IntPtr(ptag.ToInt32() + Marshal.SizeOf(tag));
  }
}
while(true);

<br />
IntPtr buffer = Marshal.AllocCoTaskMem( Marshal.SizeOf( cantidad ) * sVN.Length); // or Marshal.AllocHGlobal (COM or not)      <br />
Marshal.Copy( sVN, 0, buffer, sVN.Length );<br />

<br />
IntPtr ptag = new IntPtr ();<br />
ptag = Marshal.StringToHGlobalAnsi ("maybe...");<br />
ArrayList tags = new ArrayList();<br />
do <br />
{<br />
	string tag = Marshal.PtrToStringAnsi (ptag); //PtrToStringUni (ptag);    // ptag is pointer to string[], make sure about unicode/ansi, i assume unicode  <br />
	if (tag == "") break;  <br />
	else   <br />
	{    <br />
		tags.Add(tag);    <br />
		ptag = new IntPtr(ptag.ToInt32() + <br />
		Marshal.SizeOf(Marshal.StringToHGlobalAnsi (tag)));  <br />
	}<br />
}while(true);

string[] strarr = new string[]{"one","two","three","four"};
IntPtr firstpointer;
int counter = 0;
foreach (string str in strarr)
{
  IntPtr ptr = Marshal.StringToHGlobalUni(str);
  if (counter++ == 0) firstpointer = ptr;
}

Method(..., IntPtr sbufN, firstpointer,...);

for (int i = 0; i < strarr.Length; i++)
{
  strarr[i] = Marshal.PtrToStringUni(firstpointer);
  firstpointer = new IntPtr(firstpointer.ToInt32() + Marshal.SizeOf(strarr[i]));
}