struct mystruct {
	HANDLE hwnd;
	HANDLE hwnd2;
	HANDLE thread;
};
 
void *do_open(char *one, char *two)
{
struct mystruct *mystruct = malloc (sizeof (*mystruct));
// some code
return mystruct;
}

Public Declare Function do_open Lib "my.dll" (one As String, two As String) As _
  Long