SD - read()

Read from the file. read() inherits from the Stream utility class.

Syntax

file.read() 
file.read(buf, len)

Parameters

• file: an instance of the File class (returned by SD.open()).
• buf: an array of characters or bytes.
• len: the number of elements in buf.

Returns

When used as file.read(): The next byte (or character), or -1 if none is available.

When used as file.read(buf, len): The amount of bytes read, or -1 if an error occurred.

See also

• name()
• available()
• close()
• flush()
• peek()
• position()
• print()
• println()
• seek()
• size()
• write()
• isDirectory()
• openNextFile()
• rewindDirectory()