Converting 8.3 paths to long paths

Hello:

     I need a way to convert 8.3 shorten paths (windows 95 paths containing ~1 at the end) to their long names.  There is a function in Win32 api, called GetShortPathName() which converts a long path to a short one.  There's also a function called GetFullPathName() but that seems to do absolutely nothing.  It has 4 parameters, filename, size of path buffer, path buffer, and buffer to recieve the 'full' filename.  I've tried everything, but can't seem to get it to work properly.  If someone could show me how to do this correctly (C win32 API) I would appreciate it.  Example:
       I need to convert the directory of "Exampl~1" (dos 8.3 name) to "Example of long directory name" (long file name).
            Thanks, phuene
phueneAsked:
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chensuCommented:
There is a program to do so written by Jeffrey Richter published on MSJ May 1997 Vol 12 No 5. I modified the program and wrote a function as the following.

DWORD WINAPI ShortPathToLongPath(LPCTSTR lpszShortPath,
                                 LPTSTR lpszLongPath, DWORD cchBuffer)
{
    // Ensure that the string is Unicode.
    WCHAR wszShortPath[MAX_PATH];
    ::MultiByteToWideChar(CP_ACP, 0, lpszShortPath, -1,
                              wszShortPath, MAX_PATH);

      // Get the Desktop's shell folder interface
      LPSHELLFOLDER psfDesktop = NULL;
      HRESULT hr = ::SHGetDesktopFolder(&psfDesktop);

      // Request an ID list (relative to the desktop) for the short pathname
      ULONG chEaten = 0;
      LPITEMIDLIST pidlShellItem = NULL;
      hr = psfDesktop->ParseDisplayName(NULL, NULL, wszShortPath, &chEaten,
                                          &pidlShellItem, NULL);

      // Release the desktop's IShellFolder
      psfDesktop->Release();

      if (SUCCEEDED(hr))
      {
            // We did get an ID list, convert it to a long pathname
            CHAR szLongPath[MAX_PATH];
            ::SHGetPathFromIDList(pidlShellItem, szLongPath);

            // Free the ID list allocated by ParseDisplayName
            LPMALLOC pMalloc = NULL;
            ::SHGetMalloc(&pMalloc);
            pMalloc->Free(pidlShellItem);
            pMalloc->Release();

            // copy the long pathname
            DWORD dwCopy = min(::lstrlen(szLongPath) + 1, cchBuffer);
            :: lstrcpyn(lpszLongPath, szLongPath, dwCopy);

            return dwCopy;
      }
      else
            return 0;
}

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phueneAuthor Commented:
Thanks, exactly what I was looking for.
       Regards, phuene
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