查看SD.open()的源代码

:[[SD库|SD]]

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<font color="olivedrab" size="+3">'''open()'''</font>


<font color="orange" size="+1">'''描述'''</font>

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). 


<font color="orange" size="+1">'''语法'''</font>

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


<font color="orange" size="+1">'''参数'''</font>

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.


<font color="orange" size="+1">'''返回值'''</font>

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)". 

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