How to find out if a file exists

How do I find out if a file exists?

Please be more specific with your question.

What operating system?
Compiler? etc.

There should be a portable way to do this, that wouldn't depend on OS, compiler, etc.

If there isn't, I am using Windows XP + MinGW.

ropez (312)

Typically you only check if the file exists when you want to read from it:

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ifstream ifile(filename);
if (ifile) {
  // The file exists, and is open for input
}

I think if you only need to check if the file exists, the most portable way is to test if you can open it:

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bool fexists(const char *filename)
{
  ifstream ifile(filename);
  return ifile;
}

The return statement should cast the file object to a boolean which is true if the file exists. The file is automatically closed at the end of the function scope.

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