45 lines
1.6 KiB
Plaintext
45 lines
1.6 KiB
Plaintext
|
Relative paths in SdFat are resolved in a manner similar to Windows.
|
||
|
|
|
||
|
|
Each instance of SdFat has a current directory. In SdFat this directory
|
||
|
|
is called the volume working directory, vwd. Initially this directory is
|
||
|
|
the root directory for the volume.
|
||
|
|
|
||
|
|
The volume working directory is changed by calling SdFat::chdir(path).
|
||
|
|
|
||
|
|
The call sd.chdir("/2011") will change the volume working directory
|
||
|
|
for sd to "/2011", assuming "/2011" exists.
|
||
|
|
|
||
|
|
Relative paths for SdFat member functions are resolved by starting at
|
||
|
|
the volume working directory.
|
||
|
|
|
||
|
|
For example, the call sd.mkdir("APRIL") will create the directory
|
||
|
|
"/2011/APRIL" assuming the volume working directory is "/2011".
|
||
|
|
|
||
|
|
SdFat has a current working directory, cwd, that is used to resolve paths
|
||
|
|
for file.open() calls.
|
||
|
|
|
||
|
|
For a single SD card the current working directory is always the volume
|
||
|
|
working directory for that card.
|
||
|
|
|
||
|
|
For multiple SD cards the current working directory is set to the volume
|
||
|
|
working directory of a card by calling the SdFat::chvol() member function.
|
||
|
|
The chvol() call is like the Windows <drive letter>: command.
|
||
|
|
|
||
|
|
The call sd2.chvol() will set the current working directory to the volume
|
||
|
|
working directory for sd2.
|
||
|
|
|
||
|
|
If the volume working directory for sd2 is "/MUSIC" the call
|
||
|
|
|
||
|
|
file.open("BIGBAND.WAV", O_READ);
|
||
|
|
|
||
|
|
will then open "/MUSIC/BIGBAND.WAV" on sd2.
|
||
|
|
|
||
|
|
The following functions are used to change or get current directories.
|
||
|
|
See the html documentation for more information.
|
||
|
|
|
||
|
|
bool SdFat::chdir(bool set_cwd = false);
|
||
|
|
bool SdFat::chdir(const char* path, bool set_cwd = false);
|
||
|
|
void SdFat::chvol();
|
||
|
|
SdBaseFile* SdFat::vwd();
|
||
|
|
static SdBaseFile* SdBaseFile::cwd();
|