You'll have to learn a bit of C++ to be able to do this.

Also just have a look at the .tlh (and possibly .tli) file that was generated in the output folder by Visual Studio.

So, here is how to instantiate and call the COM object (for example using the Windows SDK tools/wrappers from comdef.h like _bstr_t):

#include <windows.h>
#import "COM.tlb" raw_interfaces_only, raw_native_types, no_namespace, named_guids

int main()
{
    CoInitialize(NULL);
    {
        IPersonPtr per(__uuidof(Person)); // equivalent of CoCreateInstance(CLSID_Person,..., IID_IPerson, &person)
        per->put_FirstName(_bstr_t(L"Maxim"));
        per->put_LastName(_bstr_t(L"Donax"));
        per->Persist(_bstr_t(L"c:\\myFile.xml"));
    }
    CoUninitialize();
    return 0;
}

Or a bit more simple (use convenient wrappers automagically generated):

#include <windows.h>
#import "COM.tlb"

using namespace COM; // your namespace, COM is probably not a good namespace name

int main()
{
    CoInitialize(NULL);
    {
        IPersonPtr per(__uuidof(Person));
        per->PutFirstName(L"Maxim");
        per->PutLastName(L"Donax");
        per->Persist(L"c:\\myFile.xml");
    }
    CoUninitialize();
    return 0;
}