How to redirect standard input and standard output using .Net System.Dia​gnostics.P​rocess

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Michael Maurice
Michael Maurice 2020-8-31
评论： Mohammad Sami 2020-9-2
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.

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Mohammad Sami
Mohammad Sami 2020-8-31
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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Michael Maurice
Michael Maurice 2020-9-2
编辑：Michael Maurice 2020-9-2
I think i got it! Standard input needs to be closed. I added "stdin.Close()'. This is the updated code, which is now delivering all input data from "xfoil.inp" to xfoil.exe:
%input data
fid_in = fopen('xfoil.inp','r'); % read the xfoil.inp
while ~feof(fid_in)
input = fgetl(fid_in);
disp(input)
stdin.WriteLine(input); % send the input to xfoil.exe
end
stdin.Close()

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