C++ naked function with parameter object

Question

I've a class named Person. The Person object has only 1 private property 'Age'. I was trying for making a naked assembly function with a parameter of object Person.

That object i want to store in a assemlembly register, and try for taking the property value of age in that stored register.

Storing the object in a register is hopefully well done.

mov edx, dword ptr ds:[ebp + 0x8]

But now i want to take the property value age, of the object that is been stored in EDX register. I tried a few things for picking the value up, but i received always from data. I only want to do this in inline assembly of registers. without using C++ code in the inline assembly.

person class

#include "Person.h"

Person::Person()
{
}

void Person::SetAge(int age)
{
    this->_age = age;
}

int Person::GetAge()
{
    return this->_age;
}




__declspec(naked) void ObjectCall(Person* p)
{
    int age;
    _asm
    {
        mov ebp, esp  // prologue
        push ecx 

        mov edx, dword ptr ds:[ebp + 0x8] // Take full object in parameter and put it in edx register
        mov ecx, 0x4
        mov eax, dword ptr ds:[edx + ecx]   // Trying for taking the property value of age in person object.
        mov age, eax
    }

    std::cout << age << std::endl;
    _asm
    {
// epilogue
        pop ecx
        ret
    }
}

int main()
{
    Person p = Person();
    p.SetAge(5);
    ObjectCall(&p);
}