How to call a .exe filed compiled in Fortran having multiple text input files through a MATLAB gui ?

Hello, I am trying to create a MATLAB gui which call a .exe file compiled in Fortran (CFD code), submit text input files to it, get the text output file and after modifying the input files, again submit it to the .exe file for solving. (Like a loop) How can I can execute this is MATLAB?....will the system or ! bang operator work?

Answer 1

[Walter Roberson]

   program_exe = 'C:\Programs and Executables\HyperCFD\hypercfd.exe';

   tname = tempname();
   inname1 = [tname '-in1.txt'];
   inname2 = [tname '-in2.txt'];
   outname1 = [tname '-out1.txt'];

   iteration = 0;

   while true
     iteration = iteration + 1;
     fid = fopen(inname1, 'wt');
     fprintf(fid, 'first file\nsome appropriate content\n');
     fclose(fid);

     fid = fopen(inname2, 'wt');
     fprintf(fid, 'second file\nsomething appropriate here\n');
     fclose(fid);

     cmd = sprintf('"%s" -geometry "%s" -materials "%s" -out "%s"', inname1, inname2, outname1);

     if exist(outname1, 'file'); delete(outname1); end

     [status, msg] = system(cmd);

     if status ~= 0
       fprintf('Failed to run executable on iteration #%d, giving up iterating\n', iteration);
       break;
     end

     if ~exist(outname1, 'file')
       fprintf('Iteration %d: Executable ran but did not create expected output file "%s", giving up iterating\n', iteration, outname1);
       break;
     end

     [fid, msg] = fopen(outname1, 'rt');
     if fid < 0
       fprintf('Iteration %d: Output file exists but cannot be opened. Giving up iterations. File "%s", reason "s"\n', iteration, outname1, msg );
       break;
     end

     .... read in the output at this point ...

     fclose(fid);

     ... figure out how to change variables ...

   end

if exist(inname1, 'file'); delete(inname1); end
if exist(inname2, 'file'); delete(inname2); end
if exist(outname1, 'file'); delete(outname1); end