Hi,
I have problems understanding the subprocess.Popen object. I have a iterative
calculation in a process running and I want to pipe the output (stdout) from
this calculation to a Python script.
Let me include a simple code that simulates the calculating process:
/* This code simulates a big iterative calculation */
#include <stdio.h>
#include <math.h>
int main()
{
float val[2] = { M_PI, M_E };
int i;
for ( i = 0; i < 2 i++) {
sleep( 15 ); /* It's a hard calculation. It take 15 seconds */
printf("Value: %5.6f\n", val[i] );
fflush( stdout );
}
return 0;
}
let's compile this to mycalc: gcc -o mycalc calc.c ... (untested code)
In C I have this code which starts the mycalc process and handles the output
from it:
#include <stdio.h>
#include <assert.h>
#define BUF_SIZE 256
int main()
{
FILE *pip;
char line[BUF_SIZE];
pip = popen("mycalc", "r");
assert( pip != NULL );
while ( fgets( line, BUF_SIZE, pip )) {
printf( "Hello; I got: %s \n", line );
fflush( stdout );
}
pclose( pip );
return 0;
}
How can I make such while-loop in Python? I assume I should use
subprocess.Popen(), but I can't figure out how?
-Øystein
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