从c ++ system（）命令捕获缓冲区输出

Question

How would I capture the output from a php script that I run at the command line and store it to an array in c++? ie

system('php api/getSome.php');

Answer 1

system can't give output to your program. You should redirect the command output to a file, like in php api/getSome.php > somefile and read this file from your program, or you should use a proper function that can give you the command output, like popen .

Answer 2

from the man page:

system() executes a command specified in command by calling /bin/sh -c command.

Just use the shell redirection facility to dump the output of the command in a file:

 system("php api/getSome.php > output.txt 2> error.txt");

The above will give send the standard output in output.txt and the error output in error.txt .

Answer 3

Traditionally popen() is preferred when you need to IO between your parent and child process. It uses the C based FILE stream. It is a wrapper around the same low level intrinsics that also make up system(), namely fork + execl, but unlike system(), popen() opens a pipe and dups stdin/out to a stream for reading and writing.

FILE *p = popen("ping www.google.com", "r");

Then read from it like a file.