Why do I get "No method 'reqMktDataEx' with matching signature found for class 'COM.TWS_TwsCtrl_1'." in 2014a

When I try to use the 'ibtws' class in MATLAB R2013b to access data from the Interactive Brokers (IB) Trader Workstation , for instance if I am trying to run the example function 'reqMktDataEx', I get the following error:

No method 'reqMktDataEx' with matching signature found for class 'COM.TWS_TwsCtrl_1'.

My code is as follows, how can I fix this?

ib = ibtws('',7496);
eventNames = {'errMsg','tickSize','tickString','tickPrice'};
for i = 1:length(eventNames)
  registerevent(ib.Handle,{eventNames{i},...
            @(varargin)ibExampleRealtimeEventHandler(varargin{:})})
end

f = findobj('Tag','IBStreamingDataWorkflow');
if isempty(f)
  f = figure('Tag','IBStreamingDataWorkflow','MenuBar','none',...
          'NumberTitle','off');
  pos = get(f,'Position');
  set(f,'Position',[pos(1) pos(2) pos(3)+37 109])
  colnames = {'Trade' 'Size' 'Bid' 'BidSize' 'Ask' 'AskSize' ...
            'Total Volume'};
  rownames = {'AAA','BBB','DDDD'};
  data = cell(3,6);
  uitable(f,'Data',data,'RowName',rownames,'ColumnName',colnames,...
    'Position',[10 30 582 76],'Tag','SecurityDataTable');
  uicontrol('Style','text','Position',[10 5 497 20],'Tag','IBMessage');
  uicontrol('Style','pushbutton','String','Close',...
    'Callback',...
    'evalin(''base'',''close(ib);close(findobj(''''Tag'''',''''IBStreamingDataWorkflow''''));'')',...
    'Position',[512 5 80 20]);
end

ibContract = ib.Handle.createContract;
ibContract.symbol = 'IBM';
ibContract.secType = 'STK';
ibContract.exchange = 'SMART';
ibContract.currency = 'USD';

reqMktDataEx(ib.Handle,1,ibContract,'100',0);

Answer 1

[Friedrich]

Hi,

I think you missed to install something. The steps you need to take are

1) Download/Install Interactive Brokers Trader Workstation (Desktop Trading Client) from the following link: https://www.interactivebrokers.com/en/index.php?f=552

2) Download/Install the Interactive Brokers API software from the following link:

http://interactivebrokers.github.io/

3) Log into IB Trader Workstation with a license user account.

[Mike]

This answer is wrong. It's a version change issue. This function needs an additional argument.

reqMktDataEx(IB.Handle, 3, ibContract,'100',0,IB.Handle.createTagValueList);

Your answer is wrong, unfortunately.

Answer 2

[Yair Altman]

You may wish to try the cross-platform IB-Matlab product, which is Java-based (not ActiveX):

http://undocumentedmatlab.com/ib-matlab

IB-Matlab doesn't have such bugs, it is very reliable.