You can declare an empty buffer in MATLAB using the “char” and “zeros” functions, and then convert it back to a string using the “string” function. Here's how you can do it in your “FILE.m:”:
% FILE.m
function data = stepImpl(port)
buffer = char(zeros(1,30)); % Adjust size accordingly
if coder.target('Rtw')
coder.cinclude('File_Wrapper.h');
coder.ceval('function', port, coder.wref(buffer));
data = string(char(buffer));
end
end
I have used the following command to generate code.
codegen -config:lib stepImpl -args {0.0} -launchreport
I hope this helps.
