File I/O by extension type

I am having difficulty reading in files that end in a specific extension. Essentially, I would like to open all of the files of a certain type within a folder that inludes files of various types. I am using dirent.h as my header file and (if it matters) my complier is Xcode. Any help, or, if possible, source code would be greatly appreciated. Thanks everyone!


-romanpitch

So is your approach to read all the files, then match the extension?

Code:

---

//Find First File
  HANDLE hFind;
    WIN32_FIND_DATA FindData;
    string file = "\\*.*";
    hFind = FindFirstFile ((file).c_str(), &FindData);
    doSomething(FindData.cFileName);

// Look for more

    while (FindNextFile(hFind, &FindData))
    {
        doSomething(FindData.cFileName, );
    }

---

I didn't think they wanted a Win32 answer mikeman118.

This FAQ tells how to read ALL files in a given directory [in teh fourth or so subsection]:
http://faq.cprogramming.com/cgi-bin/...&id=1045780608

From there, you need to use some "string pattern matching", e.g.

Code:

---

int hasExt(const char *name, const char *ext)
{
    int nlen = strlen(name);
    int elen = strlen(ext);
    // Check first if there's a chance!
    if (nlen < elen) {
      return 0;
    }
    int index = nlen - elen;
    for(int i = 0; i < elen; i++) {
      if (elen[i] != name[index+i]) {
          return 0;
      }
    }
    // If we get here, it's a match!
    return 1;
}

---

This code is untested, and I'm sure somone will poke holes in it... But it should give you an idea of how to do it.

Also, the above code is just checking if the file ends with "ext", so you could say

Code:

---

hasExt(name, "1.c");

---

and it would match "foo1.c" and "blah1.c" for example.

It's not strictly C++, as it doesn't use strings, but neither does readdir(), so I don't think that should be a requirement.

--
Mats

How about just using glob()? MacOS X provides that, doesn't it?

Quote:

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Originally Posted by Salem

I didn't think they wanted a Win32 answer mikeman118.

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I just figured that as long as it worked no one would care whether or not it was windows... unless they were using linux.

Xcode is the Mac OS X environment.