How to call an external command?

[Cris Ding]

Hi, everyone,

Now I need to execute an external command in my C program. For
example, the dos command is "lp_solve -p < LP1.txt". I want to execute
this command in my C program so as to obtain certain result, and then
continue to execute the C codes. But I have no idea how to manage it.
Could anyone please give me some hints one this problem? Thanks in
advance!

VB
/Cris

[Joona I Palaste]

Cris Ding <cr*******@mh.se> scribbled the following:

Hi, everyone, Now I need to execute an external command in my C program. For
example, the dos command is "lp_solve -p < LP1.txt". I want to execute
this command in my C program so as to obtain certain result, and then
continue to execute the C codes. But I have no idea how to manage it.
Could anyone please give me some hints one this problem? Thanks in
advance!

You'll want system().

--
/-- Joona Palaste (pa*****@cc.helsinki.fi) ------------- Finland --------\
\-- http://www.helsinki.fi/~palaste --------------------- rules! --------/
"I will never display my bum in public again."
- Homer Simpson

[nrk]

Cris Ding wrote:

Hi, everyone,

Now I need to execute an external command in my C program. For
example, the dos command is "lp_solve -p < LP1.txt". I want to execute
this command in my C program so as to obtain certain result, and then
continue to execute the C codes. But I have no idea how to manage it.
Could anyone please give me some hints one this problem? Thanks in
advance!

VB
/Cris

You happen to be in luck. This is part of the CLC FAQ:

http://www.eskimo.com/~scs/C-faq/q19.27.html

Please take the time to read through the rest of the fine FAQ before posting
further questions:
http://www.eskimo.com/~scs/top.html

-nrk.

--
Remove devnull for email

[Derk Gwen]

cr*******@mh.se (Cris Ding) wrote:
# Hi, everyone,
#
# Now I need to execute an external command in my C program. For
# example, the dos command is "lp_solve -p < LP1.txt". I want to execute
# this command in my C program so as to obtain certain result, and then
# continue to execute the C codes. But I have no idea how to manage it.
# Could anyone please give me some hints one this problem? Thanks in

You should look up the system() function.
rc = system("lp_solve -p < LP1.txt");
will parse the string, execute the command, and return a response code
if your system implements this function.

--
Derk Gwen http://derkgwen.250free.com/html/index.html
You face forward, or you face the possibility of shock and damage.

[Cris Ding]

Derk Gwen <de******@HotPOP.com> wrote in message news:<10*************@corp.supernews.com>...

cr*******@mh.se (Cris Ding) wrote:
# Hi, everyone,
#
# Now I need to execute an external command in my C program. For
# example, the dos command is "lp_solve -p < LP1.txt". I want to execute
# this command in my C program so as to obtain certain result, and then
# continue to execute the C codes. But I have no idea how to manage it.
# Could anyone please give me some hints one this problem? Thanks in

You should look up the system() function.
rc = system("lp_solve -p < LP1.txt");
will parse the string, execute the command, and return a response code
if your system implements this function.

OK, it works. Thank you guys very much!

VB
/Cris