SdFat not reading in the loop

i have following code  (very paraphrased, guards removed ease.  real code attached).
using greiman's sdfat here: https://github.com/greiman/sdfat

code: [select]


#include <sdfat.h>

sdfat sd;
sdfile file;

void setup()
{
  sd.begin(chipselect, spispeed);
    int maxfiles = 0;
    while (file.opennext(sd.vwd(), o_read)) {
      maxfiles++;
      file.close();
    }
    cout << "init: " << maxfiles << endl;
}

void loop()
{
  int maxfiles = 0;
  while (file.opennext(sd.vwd(), o_read)) {
    maxfiles++;
    file.close();
  }
  cout << "loop: " << maxfiles << endl;
}


i output:
init: 83
loop: 0

it seems opennext failing in loop.

anyone have ideas?

i figured out.

if isopen() fails opennext()

you need close() first.  :/

(or create macro close if open before opening next.)

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