How can I call a .com function through MatLab

2012 11 13
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I have a .COM file that can be run through the windows cmd prompt. This file takes 3 user inputs to run. I'd like to be able to run this function in a batch with per-determined inputs.
I've tried using the system and dos functions as follows:
system('myfile.com arg1 arg2 arg3')
system('"myfile.com" arg1 arg2 arg3')
dos('myfile.com arg1 arg2 arg3')
dos('"myfile.com" arg1 arg2 arg3')
These seem to put matlab in an endless loop. I know that the .com program take a short time to run, but when I attempt to call it in this way matlab just runs and I need to use 'ctrl + Break' to stop. Any advice would be appreciated.

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Walter Roberson
Walter Roberson 2012-11-13
Does it take the user inputs on the command line, or does it prompt for them?
Casey
Casey 2012-11-13
To run the program I type the name into the cmd line and then get prompted 3 times to enter the 3 inputs

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Walter Roberson
Walter Roberson 2012-11-13

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In MATLAB, create a file that contains the three input files, one per line. Then,
system(['myfile.com <' TheFileName])

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Casey
Casey 2012-11-13
This yields the same results (or lack there of) as my other attempts
Walter Roberson
Walter Roberson 2012-11-13
How exactly is it prompting? If it is prompting in a graphics window, then you need to winopen() and then use the Java Robot Class.
Casey
Casey 2012-11-13
It prompts though the cmd line:
C:\> Myfile.OUT
Yes no question: 'Y/N'
file name: 'file1'
file name: 'file2'
Walter Roberson
Walter Roberson 2012-11-13
Is there a possibility of recompiling the source for the .COM as a .EXE ? My memory of how .COM work is somewhat tattered these days.
Casey
Casey 2012-11-13
No, I don't have access to the source code only the .COM file
Walter Roberson
Walter Roberson 2012-11-13
Tracing (without solution): .COM are MS-DOS 16 bit executables, which are emulated in MS Windows by the program ntvdm.exe (which is not present in 64 bit versions of MS Windows.) I do not seem to find information about whether I/O redirection is possible on the command line for those executables.
I would suggest experimenting with using the < I/O redirection at the Windows Command level; it would be useful to determine whether it works there but fails when system()'d.
The most practical approach might be to rewrite the program.
Casey
Casey 2012-11-13
It looks like the < I/O redirection is not possible, running from the cmd line:
C: [Myfile.COM < inputs.txt] -> The system cannot find the file specified
C: ['Myfile.COM inputs.txt] - The system cannot find the file specified
C: Myfile.COM < inputs.txt -> Prompt for first input
C: [Myfile.COM arg1 arg2 arg3] -> '[Myfile.COM' is not recognized as an internal or external command, operable program or batch file.
C: Myfile.COM arg1 arg2 arg3 -> Prompt for first input
I don't think I can have the skill to rewrite the program, but I would like to know if this is impossible (seems to be the case) so we don't waste more time on it.
Thank you for all of you help.
Walter Roberson
Walter Roberson 2012-11-13
The [] should not appear in your code. The C: probably should not appear but shouldn't hurt.
MyFile.COM < inputs.txt
or
C:MyFile.COM < inputs.txt
are the syntaxes I would expect to work.
The [] that I showed in the system() call are MATLAB-level array concatenation, and do not get passed to the command interpreter.
If C:MyFile.COM < inputs.txt is not working then the only other approach I can think of without getting into deep voodoo to implement redirection, would be to system("C:MyFile.COM &") and then use the Java Robot Class. You might have to winopen() cmd.exe instead of system() in order to get a proper command window running and waiting for input. There is a MATLAB File Exchange (FEX) demonstrating Java Robot.
Casey
Casey 2012-11-14
Specifying the path brings up the cmd prompt waiting for inputs. Including < inputs.txt does not get the inputs in.
I am trying to use inputemu.m from the FEX, but I'm having trouble figuring out how to send the text to the cmd prompt.
>> system(inputemu('key_normal','n\enter'))
??? Error using ==> inputemu Too many output arguments.
system('"C:MyPath with spaces"'inputemu('key_normal','n'))
??? system('"C:MyPath with spaces"'inputemu('key_normal','n')) | Error: Unexpected MATLAB expression.
Walter Roberson
Walter Roberson 2012-11-14
That approach is not going to work. Unfortunately I do not have time at the moment to explore.
Casey
Casey 2012-11-14
okay thank you for your help

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