Arduino - SDopen

Arduino

Reference Language | Libraries | Comparison | Changes

SD

## open()

#### Description

Opens a file on the SD card. If the file is opened for writing, it will be created if it doesn't already exist (but the directory containing it must already exist).

#### Syntax

SD.open(filepath)
SD.open(filepath, mode)

#### Parameters

filename: the name the file to open, which can include directories (delimited by forward slashes, /) - char *

mode (optional): the mode in which to open the file, defaults to FILE_READ - byte. one of:

- FILE_READ: open the file for reading, starting at the beginning of the file.
- FILE_WRITE: open the file for reading and writing, starting at the end of the file.

#### Returns

a File object referring to the opened file; if the file couldn't be opened, this object will evaluate to false in a boolean context, i.e. you can test the return value with "if (f)".

#### See also

- File: close()

Reference Home

Corrections, suggestions, and new documentation should be posted to the Forum.

The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.

### Share

### This link has expired.
Please re-subscribe to our Newsletters.

### Subscribe to our Newsletters

Email

Please enter a valid email to subscribe

Arduino Newsletter
Arduino Store Newsletter

### Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

Arduino
via Egeo 16
Torino, 10131
Italy

###### Newsletter

- ©2015 Arduino
- Copyright Notice
- Contact us
- About us
- Careers