Changing IP in C++ by using addIPAdress() - c++

Question

Like in the title - I've been working on code in C++ that changes my IP address. The program works "alright" and shows it added new IP, however the old IP stay the same and doesn't change.
So what I have to fix in my code to get rid off of the problem
If entire script is wrong I would really appreciate an example of program which would work.
The code:
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <winsock2.h>
#include <iphlpapi.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")
int main()
{
PMIB_IPADDRTABLE pIPAddrTable;
DWORD dwSize = 0;
DWORD dwRetVal;
UINT IPAddress;
UINT IPMask;
ULONG NTEContext = 0;
ULONG NTEInstance = 0;
LPVOID lpMsgBuf;
pIPAddrTable = (MIB_IPADDRTABLE *)malloc(sizeof(MIB_IPADDRTABLE));
if (GetIpAddrTable(pIPAddrTable, &dwSize, 0) == ERROR_INSUFFICIENT_BUFFER) {
pIPAddrTable = (MIB_IPADDRTABLE *)malloc(dwSize);
}
if ((dwRetVal = GetIpAddrTable(pIPAddrTable, &dwSize, 0)) == NO_ERROR) {
printf("\tAddress: %ld\n", pIPAddrTable->table[0].dwAddr);
printf("\tMask: %ld\n", pIPAddrTable->table[0].dwMask);
}
else {
printf("Call to GetIpAddrTable failed.\n");
}
IPAddress = inet_addr("192.168.0.2");
IPMask = inet_addr("255.255.255.0");
if ((dwRetVal = AddIPAddress(IPAddress,
IPMask,
pIPAddrTable->table[0].dwIndex,
&NTEContext, &NTEInstance)) == NO_ERROR) {
printf("\tIP address added.\n");
}
else {
printf("Error adding IP address.\n");
if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, dwRetVal, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR)& lpMsgBuf, 0, NULL)) {
printf("\tError: %s", lpMsgBuf);
}
LocalFree(lpMsgBuf);
}
system("c:\\windows\\system32\\ipconfig");
system("pause");
}
Footnote: Program was modified from an example from Microsoft https://msdn.microsoft.com/en-us/library/windows/desktop/aa365875(v=vs.85).aspx Though, it contains error which makes my VS to reach breakpoints caused by 'GlobalFree(pIPAddrTable);'
If anyone interested I'm inviting for a C++ project on GitHub

Answer 1

All is conformant with MSDN documentation. The page on AddIpAddress states:
The AddIPAddress function is used to add a new IPv4 address entry on a local computer. The IPv4 address added by the AddIPAddress function is not persistent...
That means that calling this function will have no effect on pre-existing network addresses and just add a temporary new one.
If you want the change the static network address, you should try to use the EnableStatic method of the Win32_NetworkAdapterConfiguration class.