SD : File class
Directories (or folders) are special kinds of files, this function reports if the current file is a directory or not.
file.isDirectory()
file: an instance of the File class (returned by file.open()
boolean
#include <SD.h> File root; void setup() { Serial.begin(9600); pinMode(10, OUTPUT); SD.begin(10); root = SD.open("/"); printDirectory(root, 0); Serial.println("done!"); } void loop() { // nothing happens after setup finishes. } void printDirectory(File dir, int numTabs) { while(true) { File entry = dir.openNextFile(); if (! entry) { // no more files //Serial.println("**nomorefiles**"); break; } for (uint8_t i=0; i<numTabs; i++) { Serial.print('\t'); } Serial.print(entry.name()); if (entry.isDirectory()) { Serial.println("/"); printDirectory(entry, numTabs+1); } else { // files have sizes, directories do not Serial.print("\t\t"); Serial.println(entry.size(), DEC); } } }