Run a command with parameter from c++ program

Question

I want to run an .exe file from my c++ program. but I also want to pipe an input file and take output of that file into another file.

I know that this can be done from command line as:

c:> my_program.exe <"input.txt"> "output.txt"

with this command, my_program takes all standard input from input.txt and gives standard output to output.txt

Now I want this should happen from my C++ program. my my_program.exe is in D: drive. also input.txt is in D: drive.

Please tell me how can I accomplish my goal.

@DrakaSAN I want that command to be run from c++ or c program — Bhavesh Munot, Mar 20 '14 at 11:37
You mean [this?](http://stackoverflow.com/questions/1478171/how-can-we-use-a-batch-file-in-c) — DrakaSAN, Mar 20 '14 at 11:39
Please explain your goal. If you want to read and write to file, there is fopen, fprintf, fscanf and fclose. If you want to run batch from c++, there is system. If you want to use D drive, you need to cd into it. — DrakaSAN, Mar 20 '14 at 11:45
Or you want to redirect stdin and stdout from inside of your program? — DrakaSAN, Mar 20 '14 at 11:46
Yes I want to redirect stdin to input.txt and stout to output.txt for another program. — Bhavesh Munot, Mar 20 '14 at 11:48
Could you accept the answer that helped you, so anyone having the same problem and ending up here can know what was the solution? It also help thoses who crawl the "unanswered question" to avoid losing time. — DrakaSAN, Mar 26 '14 at 16:16

score 0 · Answer 1 · answered Mar 20 '14 at 11:56

0

You need to handle input and output pipes inside your c++ program, and read/write data to files accordingly. See MSDN for example.

answered Mar 20 '14 at 11:56

Ryzhehvost

score 0 · Answer 2 · edited May 23 '17 at 12:28

0

The question was basically how to redirect stdin and stdout from the inside of C++, which as been answered here.

edited May 23 '17 at 12:28

Community

answered Mar 20 '14 at 11:56

DrakaSAN

score -1 · Answer 3 · answered Mar 20 '14 at 11:41

-1

Just change your directory to D:

cd D:\

D:>my_program.exe <"input.txt">"output.txt"

answered Mar 20 '14 at 11:41

sheu

this is not what I want. I want a c++ program to do this. I dont want to do it manually. My C++ program should do it automatically – Bhavesh Munot Mar 20 '14 at 11:43

3 Answers3