How to marshall pointer to array in C#

Question

I have c++ method with int** argument which is pointer to int array.

How can I marshall it to C#?

Not posting this as an answer because I can't confirm it; but try marshalling the parameter as `ref int[]`. — Bradley Smith, Jun 13 '12 at 08:42
Maybe [this SO answer](http://stackoverflow.com/a/3203143/650012) can also be of some help. — Anders Gustafsson, Jun 13 '12 at 09:14
It is not my case. I have pointer to array, which is declared as pointer. Not array itself. — Redwan, Jun 13 '12 at 09:24

score -1 · Answer 1 · answered Jun 13 '12 at 09:09

-1

You can try to get inspiration from this method signature:

void MyMethod([MarshalAs(UnmanagedType.LPArray, SizeConst=10)] int[] ar);

(The array is 10 in length)

answered Jun 13 '12 at 09:09

Gabriel Hautclocq

Don't forget to add the "using System.Runtime.InteropServices;" – Gabriel Hautclocq Jun 13 '12 at 09:09
Additionally, you can have a look at http://msdn.microsoft.com/en-us/library/z6cfh6e6(v=vs.80).aspx – Gabriel Hautclocq Jun 13 '12 at 09:11
Nah, that won't work. My array doesn't have const size. it varies from call to call. And I can't put nonconstant data in attribute. – Redwan Jun 13 '12 at 09:20
How about something like : void MyMethod([MarshalAs(UnmanagedType.SafeArray, SafeArraySubType=VT_I4)] int[] ar); – Gabriel Hautclocq Jun 13 '12 at 09:29
See http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.varenum.aspx for alternatives to the "VT_I4" safe array sub type. – Gabriel Hautclocq Jun 13 '12 at 09:32

1 Answers1