Write to File in nonexistent path

[lehe]

Hi,
I just found that if I use fstream to write to a file under nonexistent directory, it will not report any error or do any thing you want during execution. For example, where there is no directory called "tmp" under current directory,

#include <fstream>

using namespace std;

int main()
{
    ofstream fout( "./tmp/results.txt", ios::app );
    fout << 2 <<endl;
    return 0;
}

How to specify in code to create a directory if it is not existent ? Thanks!

[brewbuck]

How to specify in code to create a directory if it is not existent ? Thanks!

Forget creating the directory, how do you determine if you need to create it? The answer is, it's not portable. The closest thing to a portable method is stat(), and that's only UNIX-portable.

[lehe]

Thanks!
So testing if a directory exists is also system-dependent? In Linux, how to make fstream to report if the directory it tries to write in does not exist, and to make one?