DFRobot FireBeetle ESP32-E Manual page 53

data：the byte, char, or string (char*) to write
buf: an array of characters or bytes
len：the number of elements in buf
Return*: the number of bytes written
isDirectory(）
Description: Reports if the current file is a directory or not Syntax: file.isDirectory()
Parameter:
file: an instance of the File class
Return*:boolean. True if the file is a directory, false if not
openNextFile()
Description: Reports the next file or folder in a directory. Syntax: file.openNextFile()
Parameter:
file: an instance of the File class that is a directory
Return*: the next file or folder in the path
rewindDirectory()
Description: Back to the first file in the directory Syntax: file.rewindDirectory()
Parameter:
file: an instance of the File class.
Return*: None
9.2 IR Remote Control
IRrecv Class
IRrecv class can be used to receive and decode infrared signals Before using this class you need to instantiate an object of the class Its