C++ popen not getting all of stdout - c++

Question

Basically I want to read all data from stdout when running a program with popen. However, the program I run will not return the last output line into my buffer and I do not understand why (my understanding: I would get any output sent to stdout {unbuffered?} from popen).
// $Id: popen.cpp 126 2011-04-25 18:48:02Z wus $
#include <iostream>
#include <stdio.h>
using namespace std;
/**
* run debians apt-get and check output
*/
int main(int argc, char **argv, char **envp) {
FILE *fp;
char buffer[9];
// select a package which is not installed and has uninstalled dependencies,
// apt-get will ask if it should installed «Y» or nor «n».
char command[255] = "apt-get install python-wxtools";
cout << command << endl;
// Execute command, open /dev/stdout for reading
fp = popen(command, "r");
// read output character by character
while (fread(buffer, 1, 1, fp) != EOF) {
cout << buffer;
}
// close
pclose(fp);
}
native output looks like this:
$ sudo apt-get install python-wxtools
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
python-wxgtk2.8 python-wxversion
Suggested packages:
wx2.8-doc wx2.8-examples ruby wish tk8.5 tcsh csh octave3.0 mksh pdksh
python-xml editra
The following NEW packages will be installed:
python-wxgtk2.8 python-wxtools python-wxversion
0 upgraded, 3 newly installed, 0 to remove and 8 not upgraded.
Need to get 5,942kB of archives.
After this operation, 25.0MB of additional disk space will be used.
Do you want to continue [Y/n]?
NOTE: no newline at the end of the last line.
when I use my own program, the last line is missing (output)
$ sudo ./test/popen
g++ -Wall -o test/popen test/popen.cpp
test/popen.cpp: In function ‘int main(int, char**, char**)’:
test/popen.cpp:22: warning: comparison between signed and unsigned integer expressions
apt-get install python-wxtools
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
python-wxgtk2.8 python-wxversion
Suggested packages:
wx2.8-doc wx2.8-examples ruby wish tk8.5 tcsh csh octave3.0 mksh pdksh
python-xml editra
The following NEW packages will be installed:
python-wxgtk2.8 python-wxtools python-wxversion
0 upgraded, 3 newly installed, 0 to remove and 8 not upgraded.
Need to get 5,942kB of archives.
After this operation, 25.0MB of additional disk space will be used.
NOTE: newline at the end of output

Answer 1

fread does not return EOF when it reaches end of file. Rather, it returns 0. But I suspect the problem is that apt-get is detecting that its input is not a tty and is thus not printing the prompt at all.

Answer 2

The problem isn't that you aren't reading the last line, the problem is that you aren't displaying it due to cout being line buffered.
cout << buffer << flush;
should work.