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newbie ?: how do i run external .exe and com files from a c program

Posted on 2004-04-06
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Last Modified: 2010-04-15
how do i run external .exe and com files from a c program. i also need to use switches when running these. so for instance i need to run a program like this "c:\command.com /c dir"
also how do i find out if a file or directory exists in c.
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Question by:ico2
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Expert Comment

by:ankuratvb
ID: 10763910
Hi, for running external programs ,u can use the system() command.

do this:
system("c:\command.com /c dir");

U can also use the execl(when u know how many separate arguments and execv(when u have variable arguments) functions

>how do i find out if a file or directory exists in c.
Use the findfirst() function
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ankuratvb earned 20 total points
ID: 10763934
/* findfirst and findnext example */

#include <stdio.h>
#include <dir.h>

int main(void)
{
   struct ffblk ffblk;
   int done;
   printf("Directory listing of *.*\n");
   //system("cd\");
   done = findfirst("*.*",&ffblk,0);
   while (!done)
   {
      printf("  %s\n", ffblk.ff_name);
      done = findnext(&ffblk);
   }
   return 0;
}
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Author Comment

by:ico2
ID: 10763936
when i run that i get this error:
lexical: unknown escape sequence `\c'
'("a:\command.com /c dir")'
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Expert Comment

by:ankuratvb
ID: 10763938
The above example is for dos.U have findfirst() and findnext() fns. in other platforms as well.
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Expert Comment

by:ankuratvb
ID: 10763943
Do this to search for files:
done = findfirst("find.txt",&ffblk,0);
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Author Comment

by:ico2
ID: 10763959
thanks for the help ankuratvb. i now do not need to use command.com in my os.
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Expert Comment

by:ankuratvb
ID: 10763979
U'll have to use:
system("c:\\command.com /c dir");

To avoid the escape sequence.
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