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 SD.open()).1 if the current file is a directory, 0 if not.
#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);
}
}
}