Introduction to the popen function!

1. header file and prototype of the function:

<Stdio. h>, file * popen (const char * command, const char * type:

Int pclose (File * stream );

2. function: Create a process by creating an MPS queue and call sh. Because the MPs queue is defined as one-way, the type parameter can only be set to read-only or write-only. The standard output of command is used as the standard input of the stream.

3: Example

 

# Include

Int main (INT argc, char * argv [])
{

Char Buf [128];
File * PP;

If (Pp = popen ("ls-L", "R") = NULL)
{
Printf ("popen () error! /N ");
Exit (1 );
}

While (fgets (BUF, sizeof Buf, pp ))
{
Printf ("% s", Buf );
}
Pclose (PP );
Return 0;
}