C++ Add DNS entry into network adapter

Question

I have to programatically add DNS server address in network adapter settings on windows. Programming language is C++.

Answer 1

You can take a look to the IP Helper API

You can find how to use it There

Answer 2

Setting DNS using iphelp and register at CodeProject.

bool RegSetDNS(LPCTSTR lpszAdapterName, LPCTSTR pDNS)
{
    HKEY hKey;
    string strKeyName = "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\";
    strKeyName += lpszAdapterName;
    if(RegOpenKeyEx(HKEY_LOCAL_MACHINE,
                strKeyName.c_str(),
                0,
                KEY_WRITE,
                &hKey) != ERROR_SUCCESS)
        return false;

    char mszDNS[100];

    strncpy(mszDNS, pDNS, 98);

    int nDNS;

    nDNS = strlen(mszDNS);

    *(mszDNS + nDNS + 1) = 0x00;    // REG_MULTI_SZ need add one more 0
    nDNS += 2;

    RegSetValueEx(hKey, "NameServer", 0, REG_SZ, (unsigned char*)mszDNS, nDNS);

    RegCloseKey(hKey);

    return true;
}