Question

I have a C++ code that calls a test. I am doing a system call to execute this test. When this test fails, it will display something like this ” ERROR: One or more devices of following component type(s) could not be discovered:”

I have a C++ code that runs on Linux redhat and it is capable of detecting if the system call pass or failed. But it can not capture the error message (ERROR: One or more devices of following component type(s) could not be discovered:) and append into the log file or print it.

Can someone please tell me how to capture the error message (ERROR: One or more devices of following component type(s) could not be discovered:)?
PS: I am an intern, any help would be really nice.

#include<iostream.h>
int main () 
{   
  int i;   
  if (system(NULL)) 
    puts ("Ok");   
  else 
    exit (1);

  i=system("hpsp --discover -verbose --user Admin --oapasswd password");  

  printf ("The value returned was: %d.\n",i);

  return false;
}

Answer 1

Instead of using system() use popen(). This will open a pipe capturing the standard output of the test program so that your program can read it via the pipe.

Example EDITED:

#define _BSD_SOURCE 1
#define BUFFSIZE 400

#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[])
{
    char *cmd = "hpsp --discover -verbose --user Admin --oapasswd password";

    char  buf[BUFFSIZE];
    char* searchResult;
     int  testPassed = 0;

    FILE *ptr;

    if ((ptr = popen(cmd, "r")) != NULL)
        while (fgets(buf, BUFFSIZE, ptr) != NULL)
        {
            if ((searchResult = strstr(buf, "The test passed")) != NULL )
            {
                testPassed = 1;
                break;
            }
        }

    if (testPassed)
        printf("yea!!\n");
    else
        printf("boo!!\n");

    pclose(ptr);

    return 0;
}