How to pass the block (structure) of data from dll to app

Hello!
What is the right way to pass structure of data from dll to program that uses this dll, the structure can have more then two elements and also contains string.
As I know (and I tried to do this) it's impossible to pass pointer to the structure which is declared in dll. The Windows says the system perfomed an incorrect opperation and program will be closed.

Thank you for reading this question and hope for your help!

Constantin Kuznetsov Jr.