How to redirect standard input and standard output using .Net System.Diagnostics.Process
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Michael Maurice
on 31 Aug 2020
Commented: Mohammad Sami
on 2 Sep 2020
I'm working on some optimisation code and have recently moved away from using the system() function to open xfoil.exe and direct input and output files,
cmd = sprintf('cd %s && xfoil.exe < xfoil.inp > xfoil.out &',working_directory);
[status,result] = system(cmd);
and I am now attempting to complete the same operations using:
process = System.Diagnostics.Process();
process.StartInfo.FileName = 'xfoil.exe';
process.StartInfo.Arguments = %not sure what to put here%;
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardInput = true;
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.CreateNoWindow = false;
process.Start();
I'm not very experienced with coding in general, so I'm struggling a bit here, but I really need some help to figure out how to redirect standard input and standard output to my two files (xfoil.inp and xfoil.out) using .Net System.Diagnostics.Process.
Accepted Answer
Mohammad Sami
on 31 Aug 2020
You can try this. You may have to choose the option on how to decide when xfoil.exe has finished reading.
process = System.Diagnostics.Process();
process.StartInfo.FileName = 'xfoil.exe';
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardInput = true;
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.CreateNoWindow = false;
process.Start();
stdin = process.StandardInput;
stdout = process.StandardOutput;
fid = fopen('xfoil.inp','r'); % read the xfoil.inp
txt = fread(fid,'*char');
fclose(fid);
stdin.Write(txt); % send the input to xfoil.exe
out = stdout.ReadToEndAsync;
% wait for xfoil.exe to finish processing
% option 1
pause(1); % pause for a predefined amount of time
% option 2
% wait until xfoil.exe has terminated
while(~process.HasExited)
pause(1);
end
try
process.Kill; % kill the process if needed.
catch
end
xfoil_out = char(out.Result);
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