Thread: Popen problem with stdout buffer

Code:

char buffer[BUFSIZ+1];
string Process::child_Output( string input ) {
    string temp;
    memset(buffer, '\0', sizeof(buffer));
    read = popen(input.c_str(), "r");
    if(read!=NULL) {
        chars_read = fread(buffer, sizeof(char), BUFSIZ, read);
        if(chars_read>0) {
            temp = buffer;
            pclose(read);
            return temp;
        }
    }
    return " ";
}

Assume I got this command to tell you what wallpaper are you using:
$ stupid
/home/knight/wallpaper/very_stupid.png

So with that function, I can save the output of stupid program to string

Code:

  Process p; 
 string stupid_person = p.child_Output("stupid");

The problem is my stupid_person string is doomed. My stupid_person string will be like this:
"/home/knight/wallpaper/very_stupid.png____________________________"
I want it be like this:
"/home/knight/wallpaper/very_stupid.png"

_ is space character.
See the difference? I know I can do that with dirty work. I can start from the end of the string and track the " " character then finally cut it. But is there any elegant way to do this? Maybe there are function that better than
fread(buffer, sizeof(char), BUFSIZ, read);

Thank you.............

Well I would normally use fgets() to read from a pipe writing lines of text, just like I would use fgets() for reading from a text file

fread(buffer, sizeof(char), BUFSIZ, read);
With this function my string will be:
/home/knight/wallpaper/very_stupid.png\n
There is \n that miss from my sight.

Arrggggggghhhhhhhhhhhhhhh......................... .....