M-S-Function Data Type ID conversion from class name

Hi all,

I have a M-S-Function (Level 2 Matlab S-Function) where the values driven to the output ports are read from MATLAB workspace variables, whose names are passed in as a parameter.

I want to make sure that the port's data type matches the data type of the variables.

It's easy enough to get the data type of the variable:

   varnames = block.DialogPrm(1).Data
   cls = class(evalin('base', varnames{1})); % for example

However, it's not possible to do block.OutputPort(1).Datatype = cls, as the Datatype field is read only. Instead, I can modify block.OutputPort(1).DatatypeID, which wants an integer, as per the table at http://www.mathworks.com.au/help/simulink/slref/simulink.blockdata.html#f29-108672

Is there an easy, existing, way to convert the class name (eg 'uint32') to the corresponding data type integer value (6)?

Also, the table does not mention how to convert classes int64, uint64 or logical to a port data type - is it possible to have a 64-bit integer on a simulink port?