Reading folder from SD Card runs fine the first call, second time it fails. Why?

hello,

i trying access content in folders on sd card.

assuming have structure on sd-card:

set1\   <dir>     04.06.13 12:50:20   9   ----   q:\   2013-06-04 12-50-18
rbowhlf4.bmp   62.454   30.05.13 02:16:30      -a--   q:\   2013-06-04 15-31-41
rbowhlf9.bmp   62.456   03.06.13 21:28:40      -a--   q:\   2013-06-04 15-31-38


in folder "set1\" there bmp-files.

now when first time read in content of root folder, runs fine. both 2 files , directory read internal array.

then read content of "set1" once. after try read root again, files in root detected, folder "set1" seems invisible. have idea why might be?

code: [select]



void getfilenamesfromsd(string* strdir, bool iroot)
{

  lcd.clear();
  lcd.print("scanning files  ");

  file dirroot;
  char temp[14];
  strdir->tochararray(temp,14);
  dirroot = sd.open(temp);

  m_numberoffiles = 0;
  m_fileindex = 0;

  int filecount = 0;
  string currentfilename = "";
  int strlength = 0;
  if(iroot == false) // add fake parent directory list when not in root
  {
      m_sdfiles[filecount] = sdfile("..",type_directory);
  filecount++;
  }
  while(1)
  {
    file entry =  dirroot.opennextfile();
    if (! entry) {
      // no more files
      m_numberoffiles = filecount;
      entry.close();
dirroot.rewinddirectory();
      break;
    }
    else
{
currentfilename = entry.name();

      if (entry.isdirectory())
  {
  currentfilename.touppercase();  
  m_sdfiles[filecount] = sdfile(currentfilename,type_directory);
          filecount++;
        //getnextfilename(root);
      }
      else {
currentfilename.tolowercase();
if (currentfilename.endswith(".bmp")) { //find files our extension only
//          strlength = currentfilename.length();
//          currentfilename = currentfilename.substring(0, (currentfilename.length() - 4));
          lcd.setcursor(0, 1);
          lcd.print(currentfilename);
//          m_filenames[filecount] = currentfilename;
  m_sdfiles[filecount] = sdfile(currentfilename,type_bitmap);
          filecount++;
        }
      }
    }
    entry.close();
  }
  dirroot.close();
}



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