C# --> C++ Pointer question

[calmlikeabomb]

Hello,

I am currently trying to interact with a unmanaged DLL (C++). I am attempting to call a method from the DLL that takes a List of unsigned longs and returns a status code.

Since List is of type General, this can not be marshaled so I am trying to send an Array instead. An issue arises because I need to call this Array later to get data from it and there is no method in the DLL to return this List (Array) to me.

I am trying to send a pointer of my Array in C# so I can read what is in the Array after the function in C++ inserts data into this Array.

from my main function
=============== ===
myModules = new ArrayList();
int status = CDLL.GetModuleL ist(myModules);


from CDLL
========
[DLLImport("myDL L.dll", EntryPoint="Get ModuleList"]
public static extern int GetModuleList(A rrayList moduleList);


This does not seem to work (I am not dealing with the pointers right now, I was just trying to call the function correctly).

[Plater]

Your DLLImport for the DLL function should have the same (or at least comparable) types for things.
ArrayList is not a valid unmanaged type. You would need to specify a DataType that works for both managed and unmanaged.
If it's a pointer, try using IntPtr