en:arduino:libraries:sdopen
差别
这里会显示出您选择的修订版和当前版本之间的差别。
|
en:arduino:libraries:sdopen [2016/12/25 22:15] |
en:arduino:libraries:sdopen [2016/12/25 22:15] (当前版本) |
||
|---|---|---|---|
| 行 1: | 行 1: | ||
| + | [[en:arduino:libraries:sd|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 | ||
en/arduino/libraries/sdopen.txt · 最后更改: 2016/12/25 22:15 (外部编辑)
