Write to File in nonexistent path

This is a discussion on Write to File in nonexistent path within the C++ Programming forums, part of the General Programming Boards category; Hi, I just found that if I use fstream to write to a file under nonexistent directory, it will not ...

  1. #1
    Registered User
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    Jan 2009
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    Write to File in nonexistent path

    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,
    Code:
    #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!

  2. #2
    Captain Crash brewbuck's Avatar
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    Portland, OR
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    Quote Originally Posted by lehe View Post
    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.
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

  3. #3
    Registered User
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    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?

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