Pass commands to executable run through system command

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Stephen Hall
Stephen Hall 2026-2-9，18:14
评论： Walter Roberson about 5 hours 前
I have an executable provided by an external organization that I have opened with the system command, but I need to then automatically pass it inputs and my attempts to far have failed. The executable takes 4 inputs - the first and last are numeric, the middle two are text. I have tried packaging the inputs into a text file to no avail. Here is what it looks like (I've tried a bunch of things so this is not as clean as it started):
In1 = '1';
In2 = 'C:\Dir1\File1.dat';
In3 = '02/09/2026 16:00';
In4 = '0.5';
fileID = fopen('parameters.txt','w');
fprintf(fileID,'%s\r\n %s\r\n %s\r\n %s', In1,In2,In3,In4);
fclose(fileID);
system('C:\Dir2\main.exe < parameters.txt');
The function opens in the MATLAB command window but then just waits for me to manually input each input, and the whole reason I am doing this is to be able to run this multiple times for a bunch of variations, collect the data, and then process it and display it.
  1 个评论
Steven Lord
Steven Lord about 13 hours 前
Have you checked with the external organization that provided you the executable, to confirm that the executable is designed/intended to be run in a non-interactive environment rather than requiring interactivity? Does it require certain input arguments (like the -batch startup option for MATLAB) to bypass prompting for input from the user?

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回答（2 个）

Matt J
Matt J 2026-2-9，18:29
编辑：Matt J 2026-2-9，18:32
Perhaps as follows?
In1 = '1';
In2 = 'C:/Dir1/File1.dat';
In3 = '02/09/2026 16:00';
In4 = '0.5';
cmd = sprintf('C:/Dir2/main.exe %s "%s" "%s" %s', ...
In1, In2, In3, In4);
system(cmd);
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显示 1更早的评论
Stephen Hall
Stephen Hall 10 minutes 前
No joy. It runs the executable but then just waits for manual input instead of accepting the preloaded inputs.
Matt J
Matt J about 11 hours 前
编辑：Matt J about 11 hours 前
Are you sure the executable takes the syntax you have described to us? What happens if you manually call the executable with the same 4 arguments outside of Matlab, from a Windows command prompt:
C:/Dir2/main.exe 1 "C:/Dir1/File1.dat" "02/09/2026 16:00" 0.5'

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Walter Roberson
Walter Roberson 2026-2-9，20:03
You could use the .NET facilities, System.Diagnostics.Process . See the Question at https://www.mathworks.com/matlabcentral/answers/414795-run-exe-with-an-input-file-and-close-upon-process-exit for an outline of the code of passing in standard input.
  1 个评论
Walter Roberson
Walter Roberson about 5 hours 前
Your executable appears to be bypassing standard input methods. Possibly .NET stdinput methods will work, perhaps not. If not, then there is not much you can do about the situation.

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