Add autoincrement to end of filename if previous set of files exist

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I need to create x number of files (a set) but I must first check to see if the files exist with a similar name.

For example, tiftest1.tif, tiftest2.tif, ... exist and I must write tiftest again to the same directory. I'd like to append _x to the end of the filename, where x is a number that is auto-incremented, each time that I want to create the set. So I can have tiftest1_1.tif,tiftest2_1.tif, tiftest1_2.tif, tiftest2_2.tif, tiftest1_3.tif, tiftest2_3.tif and so forth.

Here is what I have so far:

C#

...
DirectoryInfo root = new DirectoryInfo(fileWatch.Path);
FileInfo[] exist = root.GetFiles(fout + "*.tif");

if (exist.Length > 0)
{
    int cnt = 0;
    do
    {
        cnt++;
	DirectoryInfo root1 = new DirectoryInfo(fileWatch.Path);
        FileInfo[] exist1 = root.GetFiles(fout + "*" + "_" + cnt + ".tif");

        arg_proc = "-o " + "\"" + fileWatch.Path
        + "\\" + fout + "%03d_" + cnt + ".tif\" -r " + "\"" + openDialog.FileName + "\"";
        
    } while (exist1.Length > 0); //exist1 is out of scope so this doesn't work
}
else
{

    arg_proc = "-o " + "\"" + fileWatch.Path
        + "\\" + fout + "%03d.tif\" -r " + "\"" + openDialog.FileName + "\"";
}
...

exist1.length is out of scope so the loop will continually run. I'm not certain how to correct this. My method was to originally scan the directory for a match and see if the length of the array is greater than 0. If it is > 0 then the _x will autoincrement until a match isn't found. arg_proc is a string used in a function (not included) which will create the files.

Posted 12-Jul-13 12:29pm

Josheco

Updated 12-Jul-13 13:01pm

v2

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berrymaria · Answer 1 · 2013-07-12T15:12:00

C#

private static string numberPattern = " ({0})";

   public static string NextAvailableFilename(string path)
   {
       // Short-cut if already available
       if (!File.Exists(path))
           return path;

       // If path has extension then insert the number pattern just before the extension and return next filename
       if (Path.HasExtension(path))
           return GetNextFilename(path.Insert(path.LastIndexOf(Path.GetExtension(path)), numberPattern));

       // Otherwise just append the pattern to the path and return next filename
       return GetNextFilename(path + numberPattern);
   }

   private static string GetNextFilename(string pattern)
   {
       string tmp = string.Format(pattern, 1);
       if (tmp == pattern)
           throw new ArgumentException("The pattern must include an index place-holder", "pattern");

       if (!File.Exists(tmp))
           return tmp; // short-circuit if no matches

       int min = 1, max = 2; // min is inclusive, max is exclusive/untested

       while (File.Exists(string.Format(pattern, max)))
       {
           min = max;
           max *= 2;
       }

       while (max != min + 1)
       {
           int pivot = (max + min) / 2;
           if (File.Exists(string.Format(pattern, pivot)))
               min = pivot;
           else
               max = pivot;
       }

       return string.Format(pattern, max);
   }

See this thread : http://stackoverflow.com/questions/1078003/c-how-would-you-make-a-unique-filename-by-adding-a-number[^]

http://stackoverflow.com//questions/6264098/how-to-increment-the-filename-if-file-already-exists[^]