Arduino File.available()

Description

The File.available() function checks if there are any bytes available for reading from the file. The File.available() function inherits from the Stream utility class.

The File.available() function inherits from the Stream utility class.

Syntax

file.available()

Parameters

  • file: an instance of the File class that is returned by SD.open()

Returns

  • The number of bytes available ro read. The returned type: int

Example Code

Create a arduino.txt file with the below content

Hi Arduino
/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/reference/library/arduino-file.available */ #include <SD.h> #define PIN_SPI_CS 4 File file; void setup() { Serial.begin(9600); if (!SD.begin(PIN_SPI_CS)) { Serial.println(F("SD CARD FAILED, OR NOT PRESENT!")); while (1); // don't do anything more: } // open file for reading file = SD.open("arduino.txt", FILE_READ); if (file) { int length = file.available(); Serial.print("Bytes available: "); Serial.println(length); file.close(); } else { Serial.print(F("SD Card: error on opening file")); } } void loop() { }
  • Open Serial Monitor, you will see as below:
COM6
Send
Bytes available: 10
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  

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