How do I read the results of a system() call in C++?

Question

I\'m using the following code to try to read the results of a df command in Linux using popen.

#include  // file an         


        

Answer 1

Thanks to everyone who took the time to answer. A co-worker pointed me to the ostringstream class. Here's some example code that does essentially what I was attempting to do in the original question.

#include  // cout
#include  // ostringstream

int main(int argc, char** argv) {
    FILE* stream = popen( "df", "r" );
    std::ostringstream output;

    while( !feof( stream ) && !ferror( stream ))
    {
        char buf[128];
        int bytesRead = fread( buf, 1, 128, stream );
        output.write( buf, bytesRead );
    }
    std::string result = output.str();
    std::cout << "" << std::endl << result << "" << std::endl;
    return (0);
}