Question

My C++ DLL have a function like this:

void func1(int& count, int* pValue);

this function will determine the “count”, and put some values into the pValue int array which is the length of “count”.

how can I define my C# code? you can ignor the [DllImport …] part.

thanks,

Answer 1

By ref & isn’t going to happen as far as I’ve worked out.

MSDN has the answers you seek

and don’t forget to export your function from C++ as extern "C"

According to MSDN: Default marshaling for arrays on the C# side I think you want something like the following

public static extern void func1( 
  out int count, 
  [MarshalAs(UnmanagedType.LPArray, SizeParamIndex=0)] int[] values );

Where SizeParamIndex tells .net which argument will hold the size of the array to be marshaled.