Why does ofstream sometimes create files but can't write to them?

I'm trying to use the ofstream class to write some stuff to a file, but all that happens is that the file gets created, and then nothing. I have some simply code here:

#include <iostream>
#include <fstream>

#include <cstring>
#include <cerrno>

#include <time.h>

using namespace std;

int main(int argc, char* argv[])
{
    ofstream file;
    file.open("test.txt");
    if (!file) {
        cout << strerror(errno) << endl;
    } else {
        cout << "All is well!" << endl;
    }

    for (int i = 0; i < 10; i++) {
        file << i << "\t" << time(NULL) << endl;
    }

    file.flush();
    file.close();
    return 0;
}

When I create a console application, everything works fine, so I'm afraid this code is not completely representative. However, I am using code like this in a much larger project that - to be honest - I don't fully understand (Neurostim). I'm supposed to write some class that is compiled to a dll which can be loaded by Neurostim.

When the code is run, "test.txt" is created and then "No error!" is printed, as this is apparently the output from strerror. Obviously this is wrong however. The application runs perfectly otherwise, and is not phased by the fact that I'm trying to write to a corrupted stream. It just doesn't do it. It seems to me like there is no problem with permissions, because the file is in fact created.

Does anyone have any ideas what kind of things might cause this odd behavior? (I'm on WinXP Pro SP3 and use Visual C++ 2008 Express Edition)

Thanks!

Just a thought :- in your real code are you re-using your stream object?

If so, you need to ensure that you call clear() on the stream before re-using the object otherwise, if there was a previous error state, it won't work. As I recall, not calling clear() on such a stream would result in an empty file that couldn't be written to, as you describe in your question.