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Arduino File.isDirectory()
Description
The File.isDirectory() function checks if the a opened file is a directory (or folder) or not. Please note that a directory (or folder) is a special kind of file.
Syntax
file.isDirectory()
Parameters
- file: an instance of the File class (returned by file.open()
Returns
- true: If the opened file is a directory (folder)
- false: If the opened file is a file
Example Code
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/reference/library/arduino-file.isdirectory
*/
#include <SD.h>
#define PIN_SPI_CS 4
File file;
void setup() {
Serial.begin(9600);
if (!SD.begin(PIN_SPI_CS)) {
Serial.println("SD CARD FAILED, OR NOT PRESENT!");
while (1); // don't do anything more:
}
SD.mkdir("arduino/logs"); // create a directory
// create new file by opening file for writing
file = SD.open("arduino/logs/info.txt", FILE_WRITE);
file.close();
file = SD.open("arduino/logs");
if (file.isDirectory())
Serial.println("arduino/logs is a directory");
else
Serial.println("arduino/logs is a file");
file.close();
file = SD.open("arduino/logs/info.txt");
if (file.isDirectory())
Serial.println("info.txt is a directory");
else
Serial.println("info.txt is a file");
file.close();
}
void loop() {
}
- Open Serial Monitor, you will see as below:
COM6
arduino/logs is a directory
info.txt is a file
Autoscroll
Clear output
9600 baud
Newline
Tutorials
See Also
※ ARDUINO BUY RECOMMENDATION
| Arduino UNO R3 | |
| Arduino Starter Kit |
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