// Displays the amount of items in the local/server list.
void updateLabels() {
    char buf[MAXLEN];
    sprintf(buf, "Local Planets (%d)", localList->length);
    SetDlgItemText(dialogMain, lblLocal, buf);
    sprintf(buf, "Server Planets (%d)", serverList->length);
    SetDlgItemText(dialogMain, lblServer, buf);
}