Get Vehicle Pos

#include "stdafx.h"
#include <Windows.h>
#include <iostream>

#define CVehicle 0xB6F980

using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    HWND sampWindow = FindWindow(0, _T("GTA:SA:MP"));
    HANDLE hProcess;
    DWORD PID, CVehicleAddress;
    float output;

    if(!sampWindow)
    {
        cout << "SA:MP IS CLOSED!\n";
        cin.get();
        return true;
    }
    else cout << "SA:MP IS OPEN!\n";

    GetWindowThreadProcessId(sampWindow, &PID);
    hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, PID);
    if(!hProcess) cout << "Cannot open process!";

    ReadProcessMemory(hProcess, (void *) CVehicle, &CVehicleAddress, sizeof(CVehicleAddress), NULL);
    ReadProcessMemory(hProcess, (byte *) CVehicleAddress +??????, &output, sizeof(output), NULL);
    cout << "Your fPosZ: " << (float) output << "\n";
    CloseHandle(hProcess);
    cin.get();
    return true;
}