Thread: Shell output into program during runtime

I'm writing a program that needs to call a shell command during runtime. The output of said command needs to come back into the program as a c++ string.

At first I just used

Code:

system("echo Hello World > temp");
string hello = getFile("temp");//where getFile simply returns the contents of temp as a string.

However, this is horrendously slow and isn't practical. I want to redirect the output from shell directly into my program. I attempted

Code:

system("echo Hello World 1>&0");
string hello;
while(!cin.eof()){
     char c;
     cin.get(c);
     hello += c;
}

but this failed also.

If anyone can help, it would be greatly appreciated. I have a basic knowledge of C++ but only a rough understanding of bash shells, and so may be missing something obvious.

Where you get it???