SD.open()

[SD]

描述

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).

語法

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

參數

• 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.

回傳

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)“.

參考

• File: close()

函式庫參考主頁面

86Duino 參考的文本是根據 Creative Commons Attribution-ShareAlike 3.0 License，部分文本是從 the Arduino reference 修改的。 參考中的代碼示例已發佈到公共領域。