MATLAB: Save file with timestamp in a deployed application

Question

I would like to save a textfile with a timestamp as filename, but the function datetime() is not supported for C/C++ code generation with MATLAB Coder.

Is there any other way to save a TXT file with a timestamp as filename? For example:

2019-4-29_14_12_36.txt

Answer 1

If your target supports the time.h library, you could use the "strftime" function:

http://www.cplusplus.com/reference/ctime/strftime/

So a MATLAB code example would be:

function main
if coder.target('MATLAB')
    %...

    % code for execution in MATLAB
    %...
else
    rt = coder.opaque('time_t','HeaderFile','time.h');
    lt = coder.opaque('struct tm*','HeaderFile','time.h');
    coder.ceval('time',coder.wref(rt));     
    lt = coder.ceval('localtime',coder.rref(rt));
    timestamp = zeros(1,256,'int8');
    coder.ceval('strftime',coder.wref(timestamp),int32(length(timestamp)),['%Y-%m-%dT%H_%M_%S' 0], lt);
    fid = fopen(char(timestamp),'w');
    fclose(fid);    
end
end