void c_socket::setAddress(string buffer)
{    
    struct hostent *host_ip;

    m_sin.sin_addr.s_addr = inet_addr( buffer.c_str() );

    if( (int)m_sin.sin_addr.s_addr == -1 )
    {
        cout<<"buffer avant gethostbyname: +"<<buffer.c_str()<<"+"<<endl;
        host_ip = gethostbyname( buffer.c_str() );
        if (host_ip == NULL) cout <<endl<< "host_ip est null"<<endl;
        memcpy( (char *)&m_sin.sin_addr.s_addr, host_ip->h_addr, host_ip->h_length );
    }
}