set dns addr in Windows

set dns address by AdapterName

// example adapterName : {54BB6B17-91C0-4F84-83B2-DE82C525425C}
bool setDNS(QString sAdapterName, QString sDNS)
{
    HKEY hKey;
    QString strKeyName = "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\" + sAdapterName;

    if( RegOpenKeyEx(HKEY_LOCAL_MACHINE,
                     strKeyName.toStdWString().c_str(),
                     0,
                     KEY_WRITE,
                     &hKey) != ERROR_SUCCESS )
        return false;

    TCHAR Buffer[20];

    size_t convertedChars = 0;
    mbstowcs_s(&convertedChars, Buffer, sDNS.length() + 1, sDNS.toLatin1().data(), _TRUNCATE);

    convertedChars *= sizeof(TCHAR);

    RegSetValueEx(hKey, L"NameServer", 0, REG_SZ, reinterpret_cast<LPBYTE>(Buffer), convertedChars);

    RegCloseKey(hKey);

    return true;
}