Automatically Entering Inputs into Program

Hi,

I am using an old program (Program.exe) that requires you to press ENTER, then enter inputs in the following order: 'A', 'B', 'C'

I have attemped this method: https://www.mathworks.com/matlabcentral/answers/381401-automatically-entering-inputs-into-executable-code-at-prompt

commandfile = fopen('commandfile.txt','w');
fprintf(commandfile,strcat('\n', 'A', '\n', 'B', '\n', 'C', '\n');
fclose(commandfile);

system('Program.exe < commandfile.txt');

My program then runs into the error LF90.EER error # 94" (this is listed as 'Data transfer beyond end of file').

I have also attemped this method: https://www.mathworks.com/matlabcentral/answers/516792-calling-executable-and-automatically-passing-input

commandfile = fopen('commandfile.txt','w');
fprintf(commandfile,strcat('\n', 'A', '\n', 'B', '\n', 'C', '\n');
fclose(commandfile);

system('echo commandfile.txt | Program.exe');

My program then runs into the error "ELF90.EER error # 124" (this is listed as 'Unable to read file').

Any insight would be very much appreciated.

[Andrew Klingberg]

For anyone with a similar issue, I found a work around for now. Instead of sending inputs to the program via a textfile, I can enter them through keystrokes instead.

https://www.mathworks.com/matlabcentral/answers/102663-how-do-i-send-keystrokes-from-matlab-to-another-application-that-was-invoked-using-the-bang-opera

For my example, here is the code for my purpose:

h = actxserver('WScript.Shell');
h.Run('Program'); %Invokes Program.exe
pause(3); %Waits for Program to load.
h.AppActivate('Program'); %Brings Program to focus

h.SendKeys('~'); %Sends return
pause(5/100); %Waits briefly for program

h.SendKeys('A~'); %Sends A and return
pause(5/100); %Waits briefly for program

h.SendKeys('B~'); %Sends B and return
pause(5/100); %Waits briefly for program

h.SendKeys('C~'); %Sends C and return
pause(5/100); %Waits briefly for program

h.SendKeys('%{F4}'); % closes Program using Alt+F4