Freeing Memory Allocated By Unmanaged Dlll

[tristan.chaplin]

I have an unmanaged dll that returns a pointer (that it allocates, I
didn't allocate it with Marshal.AllocHGlobal), how do I free the memory
when I'm finished with it? It doesn't seem to like me calling
Marshal.FreeHGlobal on it.

I have heard rumours that the dll needs to supply its own destructor
function - is that true?

 

[Mattias Sjögren]

I have heard rumours that the dll needs to supply its own destructor
function - is that true?

It depends on which memory allocation API it uses. You have to find
that out first, hopefully the documentation will say.


Mattias

 

[V]

Hi,

If the Dll is something that you have written, then you need to
implement a method which allows freeing up memory from within the Dll
itself. You can then use this method to free the memory.

I don't think you would be allowed to free the memory allocated by the
dll from within your code.

Regards,
Vaibhav