getUserList method
Implementation
Future<TUIValueCallBack<TUIUserListResult>> getUserList(int nextSequence) {
String userData = Tools.generateUserData();
Completer<TUIValueCallBack<TUIUserListResult>> completer = Completer();
_valueCallback2Future<TUIUserListResult>(userData, completer);
_engineSDK.Dart_GetUserList(
_engineFFIPointer, nextSequence, Tools.string2PointerChar(userData));
return completer.future;
}