Dir listing

[Misfittech]

I tired to do a directory listing on exfat and it seems to fail. I can open the SD card, but the root "/" getName() returns '\0', then openNext() returns false.

bool ret=SD.begin( PIN_SD_CS); if (ret == false) { ERROR("SD error %d",ret);//,TO_MHZ(48)));//,,&SPI2)); }

	FsFile dir,f;
	char str[50];
	dir=SD.open("/");
	dir.getName(str,50);
	LOG("%s",str);
	uint32_t i=0;
	while (dir.openNext(&f) && i<170)
	{
		f.getName(str,50);
		LOG("%s",str);
		i++;
	}
	dir.close();
	f.close();

[greiman]

See the OpenNext example. Here is part of that example.

You can replace the printName() with getName().

  // Open root directory 
  if (!dir.open("/")){
    error("dir.open failed");
  }
  // Open next file in root.
  // Warning, openNext starts at the current position of dir so a
  // rewind may be necessary in your application.
  while (file.openNext(&dir, O_READ)) {
    file.printFileSize(&Serial);
    Serial.write(' ');
    file.printModifyDateTime(&Serial);
    Serial.write(' ');
    file.printName(&Serial);
    if (file.isDir()) {
      // Indicate a directory.
      Serial.write('/');
    }
    Serial.println();
    file.close();
  }
  Serial.println("Done!");

You may want to read the documentation in the doc folder for member functions. Here is openNext().

bool ExFatFile::openNext ( ExFatFile * dirFile,uint8_t oflag = O_READ )

Open the next file or subdirectory in a directory.

Parameters [in] dirFile An open instance for the directory containing the file to be opened. [in] oflag bitwise-inclusive OR of open mode flags. See see open(ExFatFile*, const char*, uint8_t).

Returns true for success or false for failure.