Basic file class. More...

#include <FatFile.h>

Inheritance diagram for FatFile:

[legend]

Public Member Functions
int	available ()

uint32_t	available32 ()

void	clearError ()

void	clearWriteError ()

bool	close ()

bool	contiguousRange (uint32_t bgnSector, uint32_t endSector)

bool	createContiguous (const char *path, uint32_t size)

bool	createContiguous (FatFile dirFile, const char path, uint32_t size)

uint32_t	curCluster () const

uint32_t	curPosition () const

bool	dirEntry (DirFat_t *dir)

uint16_t	dirIndex ()

uint32_t	dirSize ()

void	dmpFile (print_t *pr, uint32_t pos, size_t n)

bool	exists (const char *path)

	FatFile ()

	FatFile (const char *path, oflag_t oflag)

void	fgetpos (fspos_t *pos)

int	fgets (char str, int num, char delim=NULL)

uint32_t	fileSize () const

uint32_t	firstBlock () const

uint32_t	firstSector () const

void	flush ()

void	fsetpos (const fspos_t *pos)

bool	getAccessDate (uint16_t *pdate)

bool	getAccessDateTime (uint16_t pdate, uint16_t ptime)

bool	getCreateDateTime (uint16_t pdate, uint16_t ptime)

uint8_t	getError ()

bool	getModifyDateTime (uint16_t pdate, uint16_t ptime)

bool	getName (char *name, size_t size)

bool	getSFN (char *name)

bool	getWriteError ()

bool	isContiguous () const

bool	isDir () const

bool	isFile () const

bool	isHidden () const

bool	isLFN () const

bool	isOpen () const

bool	isReadable () const

bool	isReadOnly () const

bool	isRoot () const

bool	isRoot32 () const

bool	isRootFixed () const

bool	isSubDir () const

bool	isSystem () const

bool	isWritable () const

bool	ls (print_t *pr, uint8_t flags=0, uint8_t indent=0)

bool	ls (uint8_t flags=0)

bool	mkdir (FatFile dir, const char path, bool pFlag=true)

bool	open (const char *path, oflag_t oflag=0X00)

bool	open (FatFile dirFile, const char path, oflag_t oflag)

bool	open (FatFile *dirFile, uint16_t index, oflag_t oflag)

bool	open (FatVolume vol, const char path, oflag_t oflag)

bool	openNext (FatFile *dirFile, oflag_t oflag=0X00)

bool	openRoot (FatVolume *vol)

	operator bool ()

int	peek ()

bool	preAllocate (uint32_t length)

size_t	printAccessDate (print_t *pr)

size_t	printAccessDateTime (print_t *pr)

size_t	printCreateDateTime (print_t *pr)

size_t	printField (double value, char term, uint8_t prec=2)

size_t	printField (float value, char term, uint8_t prec=2)

template<typename Type >
size_t	printField (Type value, char term)

size_t	printFileSize (print_t *pr)

size_t	printModifyDateTime (print_t *pr)

size_t	printName ()

size_t	printName (print_t *pr)

size_t	printSFN (print_t *pr)

int	read ()

int	read (void *buf, size_t count)

int8_t	readDir (DirFat_t *dir)

bool	remove ()

bool	remove (const char *path)

bool	rename (const char *newPath)

bool	rename (FatFile dirFile, const char newPath)

void	rewind ()

bool	rmdir ()

bool	rmRfStar ()

bool	seekCur (int32_t offset)

bool	seekEnd (int32_t offset=0)

bool	seekSet (uint32_t pos)

bool	sync ()

bool	timestamp (uint8_t flags, uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t minute, uint8_t second)

bool	truncate ()

bool	truncate (uint32_t length)

size_t	write (const char *str)

size_t	write (const void *buf, size_t count)

size_t	write (uint8_t b)

Static Public Member Functions
static bool	legal83Char (uint8_t c)

static void	printFatDate (print_t *pr, uint16_t fatDate)

static void	printFatTime (print_t *pr, uint16_t fatTime)

Friends
class	FatVolume

Detailed Description

Basic file class.

Constructor & Destructor Documentation

◆ FatFile() [1/2]

FatFile::FatFile ( )

inline

Create an instance.

◆ FatFile() [2/2]

FatFile::FatFile	(	const char *	path,
		oflag_t	oflag
	)

inline

Create a file object and open it in the current working directory.

Parameters

[in]	path	A path for a file to be opened.
[in]	oflag	Values for oflag are constructed by a bitwise-inclusive OR of open flags. see FatFile::open(FatFile, const char, uint8_t).

Member Function Documentation

◆ available()

int FatFile::available ( )

inline

Returns: The number of bytes available from the current position to EOF for normal files. INT_MAX is returned for very large files.

available64() is recomended for very large files.

Zero is returned for directory files.

◆ available32()

uint32_t FatFile::available32 ( )

inline

Returns: The number of bytes available from the current position to EOF for normal files. Zero is returned for directory files.

◆ clearError()

void FatFile::clearError ( )

inline

Clear all error bits.

◆ clearWriteError()

void FatFile::clearWriteError ( )

inline

Set writeError to zero

◆ close()

bool FatFile::close ( )

Close a file and force cached data and directory information to be written to the storage device.

Returns: true for success or false for failure.

◆ contiguousRange()

bool FatFile::contiguousRange	(	uint32_t *	bgnSector,
		uint32_t *	endSector
	)

Check for contiguous file and return its raw sector range.

Parameters

[out]	bgnSector	the first sector address for the file.
[out]	endSector	the last sector address for the file.

Set the contiguous flag if the file is contiguous. The parameters may be nullptr to only set the flag.

Returns: true for success or false for failure.

◆ createContiguous() [1/2]

bool FatFile::createContiguous	(	const char *	path,
		uint32_t	size
	)

Create and open a new contiguous file of a specified size.

Parameters

[in]	path	A path with a valid file name.
[in]	size	The desired file size.

Returns: true for success or false for failure.

◆ createContiguous() [2/2]

bool FatFile::createContiguous	(	FatFile *	dirFile,
		const char *	path,
		uint32_t	size
	)

Create and open a new contiguous file of a specified size.

Parameters

[in]	dirFile	The directory where the file will be created.
[in]	path	A path with a valid file name.
[in]	size	The desired file size.

Returns: true for success or false for failure.

◆ curCluster()

uint32_t FatFile::curCluster ( ) const

inline

Returns: The current cluster number for a file or directory.

◆ curPosition()

uint32_t FatFile::curPosition ( ) const

inline

Returns: The current position for a file or directory.

◆ dirEntry()

bool FatFile::dirEntry ( DirFat_t * dir )

Return a file's directory entry.

Parameters

[out] dir Location for return of the file's directory entry.

Returns: true for success or false for failure.

◆ dirIndex()

uint16_t FatFile::dirIndex ( )

inline

Returns: Directory entry index.

◆ dirSize()

uint32_t FatFile::dirSize ( )

Returns: The number of bytes allocated to a directory or zero if an error occurs.

◆ dmpFile()

void FatFile::dmpFile	(	print_t *	pr,
		uint32_t	pos,
		size_t	n
	)

Dump file in Hex

Parameters

[in]	pr	Print stream for list.
[in]	pos	Start position in file.
[in]	n	number of locations to dump.

◆ exists()

bool FatFile::exists ( const char * path )

inline

Test for the existence of a file in a directory

Parameters

[in] path Path of the file to be tested for.

The calling instance must be an open directory file.

dirFile.exists("TOFIND.TXT") searches for "TOFIND.TXT" in the directory dirFile.

Returns: True if the file exists.

◆ fgetpos()

void FatFile::fgetpos ( fspos_t * pos )

get position for streams

Parameters

[out] pos struct to receive position

◆ fgets()

int FatFile::fgets	(	char *	str,
		int	num,
		char *	delim = `NULL`
	)

Get a string from a file.

fgets() reads bytes from a file into the array pointed to by str, until num - 1 bytes are read, or a delimiter is read and transferred to str, or end-of-file is encountered. The string is then terminated with a null byte.

fgets() deletes CR, '\r', from the string. This insures only a '\n' terminates the string for Windows text files which use CRLF for newline.

Parameters

[out]	str	Pointer to the array where the string is stored.
[in]	num	Maximum number of characters to be read (including the final null byte). Usually the length of the array str is used.
[in]	delim	Optional set of delimiters. The default is "\n".

Returns: For success fgets() returns the length of the string in str. If no data is read, fgets() returns zero for EOF or -1 if an error occurred.

◆ fileSize()

uint32_t FatFile::fileSize ( ) const

inline

Returns: The total number of bytes in a file.

◆ firstBlock()

uint32_t FatFile::firstBlock ( ) const

inline

Returns: first sector of file or zero for empty file.

◆ firstSector()

uint32_t FatFile::firstSector ( ) const

Returns: Address of first sector or zero for empty file.

◆ flush()

void FatFile::flush ( )

inline

Arduino name for sync()

◆ fsetpos()

void FatFile::fsetpos ( const fspos_t * pos )

set position for streams

Parameters

[in] pos struct with value for new position

◆ getAccessDate()

bool FatFile::getAccessDate ( uint16_t * pdate )

Get a file's access date.

Parameters

[out] pdate Packed date for directory entry.

Returns: true for success or false for failure.

◆ getAccessDateTime()

bool FatFile::getAccessDateTime	(	uint16_t *	pdate,
		uint16_t *	ptime
	)

inline

Get a file's access date and time.

Parameters

[out]	pdate	Packed date for directory entry.
[out]	ptime	return zero since FAT has no time.

This function is for comparability in FsFile.

Returns: true for success or false for failure.

◆ getCreateDateTime()

bool FatFile::getCreateDateTime	(	uint16_t *	pdate,
		uint16_t *	ptime
	)

Get a file's create date and time.

Parameters

[out]	pdate	Packed date for directory entry.
[out]	ptime	Packed time for directory entry.

Returns: true for success or false for failure.

◆ getError()

uint8_t FatFile::getError ( )

inline

Returns: All error bits.

◆ getModifyDateTime()

bool FatFile::getModifyDateTime	(	uint16_t *	pdate,
		uint16_t *	ptime
	)

Get a file's modify date and time.

Parameters

[out]	pdate	Packed date for directory entry.
[out]	ptime	Packed time for directory entry.

Returns: true for success or false for failure.

◆ getName()

bool FatFile::getName	(	char *	name,
		size_t	size
	)

Get a file's name followed by a zero byte.

Parameters

[out]	name	An array of characters for the file's name.
[in]	size	The size of the array in bytes. The array must be at least 13 bytes long. The file's name will be truncated if the file's name is too long.

Returns: true for success or false for failure.

◆ getSFN()

bool FatFile::getSFN ( char * name )

Get a file's Short File Name followed by a zero byte.

Parameters

[out] name An array of characters for the file's name. The array must be at least 13 bytes long.

Returns: true for success or false for failure.

◆ getWriteError()

bool FatFile::getWriteError ( )

inline

Returns: value of writeError

◆ isContiguous()

bool FatFile::isContiguous ( ) const

inline

Returns: True if the file is contiguous.

◆ isDir()

bool FatFile::isDir ( ) const

inline

Returns: True if this is a directory.

◆ isFile()

bool FatFile::isFile ( ) const

inline

Returns: True if this is a normal file.

◆ isHidden()

bool FatFile::isHidden ( ) const

inline

Returns: True if this is a hidden file.

◆ isLFN()

bool FatFile::isLFN ( ) const

inline

Returns: true if this file has a Long File Name.

◆ isOpen()

bool FatFile::isOpen ( ) const

inline

Returns: True if this is an open file/directory.

◆ isReadable()

bool FatFile::isReadable ( ) const

inline

Returns: True file is writable.

◆ isReadOnly()

bool FatFile::isReadOnly ( ) const

inline

Returns: True if file is read-only

◆ isRoot()

bool FatFile::isRoot ( ) const

inline

Returns: True if this is the root directory.

◆ isRoot32()

bool FatFile::isRoot32 ( ) const

inline

Returns: True if this is the FAT32 root directory.

◆ isRootFixed()

bool FatFile::isRootFixed ( ) const

inline

Returns: True if this is the FAT12 of FAT16 root directory.

◆ isSubDir()

bool FatFile::isSubDir ( ) const

inline

Returns: True if this is a subdirectory.

◆ isSystem()

bool FatFile::isSystem ( ) const

inline

Returns: True if this is a system file.

◆ isWritable()

bool FatFile::isWritable ( ) const

inline

Returns: True file is writable.

◆ legal83Char()

static bool FatFile::legal83Char ( uint8_t c )

inlinestatic

Check for a legal 8.3 character.

Parameters

[in] c Character to be checked.

Returns: true for a legal 8.3 character.

◆ ls() [1/2]

bool FatFile::ls	(	print_t *	pr,
		uint8_t	flags = `0`,
		uint8_t	indent = `0`
	)

List directory contents.

Parameters

[in]	pr	Print stream for list.
[in]	flags	The inclusive OR of

LS_DATE - Print file modification date

LS_SIZE - Print file size.

LS_R - Recursive list of subdirectories.

Parameters

[in] indent Amount of space before file name. Used for recursive list to indicate subdirectory level.

Returns: true for success or false for failure.

◆ ls() [2/2]

bool FatFile::ls ( uint8_t flags = 0 )

inline

List directory contents.

Parameters

[in] flags The inclusive OR of

LS_DATE - Print file modification date

LS_SIZE - Print file size.

LS_R - Recursive list of subdirectories.

Returns: true for success or false for failure.

◆ mkdir()

bool FatFile::mkdir	(	FatFile *	dir,
		const char *	path,
		bool	pFlag = `true`
	)

Make a new directory.

Parameters

[in]	dir	An open FatFile instance for the directory that will contain the new directory.
[in]	path	A path with a valid name for the new directory.
[in]	pFlag	Create missing parent directories if true.

Returns: true for success or false for failure.

◆ open() [1/4]

bool FatFile::open	(	const char *	path,
		oflag_t	oflag = `0X00`
	)

Open a file in the current working volume.

Parameters

[in]	path	A path with a valid name for a file to be opened.
[in]	oflag	bitwise-inclusive OR of open flags. See see FatFile::open(FatFile, const char, uint8_t).

Returns: true for success or false for failure.

◆ open() [2/4]

bool FatFile::open	(	FatFile *	dirFile,
		const char *	path,
		oflag_t	oflag
	)

Open a file or directory by name.

Parameters

[in]	dirFile	An open FatFile instance for the directory containing the file to be opened.
[in]	path	A path with a valid name for a file to be opened.
[in]	oflag	Values for oflag are constructed by a bitwise-inclusive OR of flags from the following list. Only one of O_RDONLY, O_READ, O_WRONLY, O_WRITE, or O_RDWR is allowed.

O_RDONLY - Open for reading.

O_READ - Same as O_RDONLY.

O_WRONLY - Open for writing.

O_WRITE - Same as O_WRONLY.

O_RDWR - Open for reading and writing.

O_APPEND - If set, the file offset shall be set to the end of the file prior to each write.

O_AT_END - Set the initial position at the end of the file.

O_CREAT - If the file exists, this flag has no effect except as noted under O_EXCL below. Otherwise, the file shall be created

O_EXCL - If O_CREAT and O_EXCL are set, open() shall fail if the file exists.

O_TRUNC - If the file exists and is a regular file, and the file is successfully opened and is not read only, its length shall be truncated to 0.

WARNING: A given file must not be opened by more than one FatFile object or file corruption may occur.

Note: Directory files must be opened read only. Write and truncation is not allowed for directory files.

Returns: true for success or false for failure.

◆ open() [3/4]

bool FatFile::open	(	FatFile *	dirFile,
		uint16_t	index,
		oflag_t	oflag
	)

Open a file by index.

Parameters

[in]	dirFile	An open FatFile instance for the directory.
[in]	index	The index of the directory entry for the file to be opened. The value for index is (directory file position)/32.
[in]	oflag	bitwise-inclusive OR of open flags. See see FatFile::open(FatFile, const char, uint8_t).

See open() by path for definition of flags.

Returns: true for success or false for failure.

◆ open() [4/4]

bool FatFile::open	(	FatVolume *	vol,
		const char *	path,
		oflag_t	oflag
	)

Open a file in the volume root directory.

Parameters

[in]	vol	Volume where the file is located.
[in]	path	with a valid name for a file to be opened.
[in]	oflag	bitwise-inclusive OR of open flags. See see FatFile::open(FatFile, const char, uint8_t).

Returns: true for success or false for failure.

◆ openNext()

bool FatFile::openNext	(	FatFile *	dirFile,
		oflag_t	oflag = `0X00`
	)

Open the next file or subdirectory in a directory.

Parameters

[in]	dirFile	An open FatFile instance for the directory containing the file to be opened.
[in]	oflag	bitwise-inclusive OR of open flags. See see FatFile::open(FatFile, const char, uint8_t).

Returns: true for success or false for failure.

◆ openRoot()

bool FatFile::openRoot ( FatVolume * vol )

Open a volume's root directory.

Parameters

[in] vol The FAT volume containing the root directory to be opened.

Returns: true for success or false for failure.

◆ operator bool()

FatFile::operator bool ( )

inline

The parenthesis operator.

Returns: true if a file is open.

◆ peek()

int FatFile::peek ( )

Return the next available byte without consuming it.

Returns: The byte if no error and not at eof else -1;

◆ preAllocate()

bool FatFile::preAllocate ( uint32_t length )

Allocate contiguous clusters to an empty file.

The file must be empty with no clusters allocated.

The file will contain uninitialized data.

Parameters

[in] length size of the file in bytes.

Returns: true for success or false for failure.

◆ printAccessDate()

size_t FatFile::printAccessDate ( print_t * pr )

Print a file's access date

Parameters

[in] pr Print stream for output.

Returns: The number of characters printed.

◆ printAccessDateTime()

size_t FatFile::printAccessDateTime ( print_t * pr )

inline

Print a file's access date

Parameters

[in] pr Print stream for output.

Returns: The number of characters printed.

◆ printCreateDateTime()

size_t FatFile::printCreateDateTime ( print_t * pr )

Print a file's creation date and time

Parameters

[in] pr Print stream for output.

Returns: The number of bytes printed.

◆ printFatDate()

static void FatFile::printFatDate	(	print_t *	pr,
		uint16_t	fatDate
	)

static

Print a directory date field.

Format is yyyy-mm-dd.

Parameters

[in]	pr	Print stream for output.
[in]	fatDate	The date field from a directory entry.

◆ printFatTime()

static void FatFile::printFatTime	(	print_t *	pr,
		uint16_t	fatTime
	)

static

Print a directory time field.

Format is hh:mm:ss.

Parameters

[in]	pr	Print stream for output.
[in]	fatTime	The time field from a directory entry.

◆ printField() [1/3]

size_t FatFile::printField	(	double	value,
		char	term,
		uint8_t	prec = `2`
	)

inline

Print a number followed by a field terminator.

Parameters

[in]	value	The number to be printed.
[in]	term	The field terminator. Use '\n' for CR LF.
[in]	prec	Number of digits after decimal point.

Returns: The number of bytes written or -1 if an error occurs.

◆ printField() [2/3]

size_t FatFile::printField	(	float	value,
		char	term,
		uint8_t	prec = `2`
	)

inline

Print a number followed by a field terminator.

Parameters

[in]	value	The number to be printed.
[in]	term	The field terminator. Use '\n' for CR LF.
[in]	prec	Number of digits after decimal point.

Returns: The number of bytes written or -1 if an error occurs.

◆ printField() [3/3]

template<typename Type >

size_t FatFile::printField	(	Type	value,
		char	term
	)

inline

Print a number followed by a field terminator.

Parameters

[in]	value	The number to be printed.
[in]	term	The field terminator. Use '\n' for CR LF.

Returns: The number of bytes written or -1 if an error occurs.

◆ printFileSize()

size_t FatFile::printFileSize ( print_t * pr )

Print a file's size.

Parameters

[in] pr Print stream for output.

Returns: The number of characters printed is returned for success and zero is returned for failure.

◆ printModifyDateTime()

size_t FatFile::printModifyDateTime ( print_t * pr )

Print a file's modify date and time

Parameters

[in] pr Print stream for output.

Returns: The number of characters printed.

◆ printName() [1/2]

size_t FatFile::printName ( )

inline

Print a file's name.

Returns: true for success or false for failure.

◆ printName() [2/2]

size_t FatFile::printName ( print_t * pr )

Print a file's name

Parameters

[in] pr Print stream for output.

Returns: true for success or false for failure.

◆ printSFN()

size_t FatFile::printSFN ( print_t * pr )

Print a file's Short File Name.

Parameters

[in] pr Print stream for output.

Returns: The number of characters printed is returned for success and zero is returned for failure.

◆ read() [1/2]

int FatFile::read ( )

inline

Read the next byte from a file.

Returns: For success read returns the next byte in the file as an int. If an error occurs or end of file is reached -1 is returned.

◆ read() [2/2]

int FatFile::read	(	void *	buf,
		size_t	count
	)

Read data from a file starting at the current position.

Parameters

[out]	buf	Pointer to the location that will receive the data.
[in]	count	Maximum number of bytes to read.

Returns: For success read() returns the number of bytes read. A value less than nbyte, including zero, will be returned if end of file is reached. If an error occurs, read() returns -1.

◆ readDir()

int8_t FatFile::readDir ( DirFat_t * dir )

Read the next directory entry from a directory file.

Parameters

[out] dir The DirFat_t struct that will receive the data.

Returns: For success readDir() returns the number of bytes read. A value of zero will be returned if end of file is reached. If an error occurs, readDir() returns -1. Possible errors include readDir() called before a directory has been opened, this is not a directory file or an I/O error occurred.

◆ remove() [1/2]

bool FatFile::remove ( )

Remove a file.

The directory entry and all data for the file are deleted.

Note: This function should not be used to delete the 8.3 version of a file that has a long name. For example if a file has the long name "New Text Document.txt" you should not delete the 8.3 name "NEWTEX~1.TXT".

Returns: true for success or false for failure.

◆ remove() [2/2]

bool FatFile::remove ( const char * path )

Remove a file.

The directory entry and all data for the file are deleted.

Parameters

[in] path Path for the file to be removed.

Example use: dirFile.remove(filenameToRemove);

Note: This function should not be used to delete the 8.3 version of a file that has a long name. For example if a file has the long name "New Text Document.txt" you should not delete the 8.3 name "NEWTEX~1.TXT".

Returns: true for success or false for failure.

◆ rename() [1/2]

bool FatFile::rename ( const char * newPath )

Rename a file or subdirectory.

Note: the renamed file will be moved to the current volume working directory.

Parameters

[in] newPath New path name for the file/directory.

Returns: true for success or false for failure.

◆ rename() [2/2]

bool FatFile::rename	(	FatFile *	dirFile,
		const char *	newPath
	)

Rename a file or subdirectory.

Parameters

[in]	dirFile	Directory for the new path.
[in]	newPath	New path name for the file/directory.

Returns: true for success or false for failure.

◆ rewind()

void FatFile::rewind ( )

inline

Set the file's current position to zero.

◆ rmdir()

bool FatFile::rmdir ( )

Remove a directory file.

The directory file will be removed only if it is empty and is not the root directory. rmdir() follows DOS and Windows and ignores the read-only attribute for the directory.

Note: This function should not be used to delete the 8.3 version of a directory that has a long name. For example if a directory has the long name "New folder" you should not delete the 8.3 name "NEWFOL~1".

Returns: true for success or false for failure.

◆ rmRfStar()

bool FatFile::rmRfStar ( )

Recursively delete a directory and all contained files.

This is like the Unix/Linux 'rm -rf *' if called with the root directory hence the name.

Warning - This will remove all contents of the directory including subdirectories. The directory will then be removed if it is not root. The read-only attribute for files will be ignored.

Note: This function should not be used to delete the 8.3 version of a directory that has a long name. See remove() and rmdir().

Returns: true for success or false for failure.

◆ seekCur()

bool FatFile::seekCur ( int32_t offset )

inline

Set the files position to current position + pos. See seekSet().

Parameters

[in] offset The new position in bytes from the current position.

Returns: true for success or false for failure.

◆ seekEnd()

bool FatFile::seekEnd ( int32_t offset = 0 )

inline

Set the files position to end-of-file + offset. See seekSet(). Can't be used for directory files since file size is not defined.

Parameters

[in] offset The new position in bytes from end-of-file.

Returns: true for success or false for failure.

◆ seekSet()

bool FatFile::seekSet ( uint32_t pos )

Sets a file's position.

Parameters

[in] pos The new position in bytes from the beginning of the file.

Returns: true for success or false for failure.

◆ sync()

bool FatFile::sync ( )

The sync() call causes all modified data and directory fields to be written to the storage device.

Returns: true for success or false for failure.

◆ timestamp()

bool FatFile::timestamp	(	uint8_t	flags,
		uint16_t	year,
		uint8_t	month,
		uint8_t	day,
		uint8_t	hour,
		uint8_t	minute,
		uint8_t	second
	)

Set a file's timestamps in its directory entry.

Parameters

[in] flags Values for flags are constructed by a bitwise-inclusive OR of flags from the following list

T_ACCESS - Set the file's last access date.

T_CREATE - Set the file's creation date and time.

T_WRITE - Set the file's last write/modification date and time.

Parameters

[in]	year	Valid range 1980 - 2107 inclusive.
[in]	month	Valid range 1 - 12 inclusive.
[in]	day	Valid range 1 - 31 inclusive.
[in]	hour	Valid range 0 - 23 inclusive.
[in]	minute	Valid range 0 - 59 inclusive.
[in]	second	Valid range 0 - 59 inclusive

Note: It is possible to set an invalid date since there is no check for the number of days in a month.; Modify and access timestamps may be overwritten if a date time callback function has been set by dateTimeCallback().

Returns: true for success or false for failure.

◆ truncate() [1/2]

bool FatFile::truncate ( )

Truncate a file at the current file position. will be maintained if it is less than or equal to length otherwise it will be set to end of file.

Returns: true for success or false for failure.

◆ truncate() [2/2]

bool FatFile::truncate ( uint32_t length )

inline

Truncate a file to a specified length. The current file position will be set to end of file.

Parameters

[in] length The desired length for the file.

Returns: true for success or false for failure.

◆ write() [1/3]

size_t FatFile::write ( const char * str )

inline

Write a string to a file. Used by the Arduino Print class.

Parameters

[in] str Pointer to the string. Use getWriteError to check for errors.

Returns: count of characters written for success or -1 for failure.

◆ write() [2/3]

size_t FatFile::write	(	const void *	buf,
		size_t	count
	)

Write data to an open file.

Note: Data is moved to the cache but may not be written to the storage device until sync() is called.

Parameters

[in]	buf	Pointer to the location of the data to be written.
[in]	count	Number of bytes to write.

Returns: For success write() returns the number of bytes written, always count. If an error occurs, write() returns -1. Possible errors include write() is called before a file has been opened, write is called for a read-only file, device is full, a corrupt file system or an I/O error.

◆ write() [3/3]

size_t FatFile::write ( uint8_t b )

inline

Write a single byte.

Parameters

[in] b The byte to be written.

Returns: +1 for success or -1 for failure.

Friends And Related Function Documentation

◆ FatVolume

friend class FatVolume

friend

FatVolume allowed access to private members.

The documentation for this class was generated from the following files:

Arduino/libraries/SdFat/src/FatLib/FatFile.h
Arduino/libraries/SdFat/src/FatLib/FatFile.cpp
Arduino/libraries/SdFat/src/FatLib/FatFileLFN.cpp
Arduino/libraries/SdFat/src/FatLib/FatFilePrint.cpp
Arduino/libraries/SdFat/src/FatLib/FatFileSFN.cpp

Public Member Functions

Static Public Member Functions

Friends

Detailed Description

Constructor & Destructor Documentation

◆ FatFile() [1/2]

◆ FatFile() [2/2]

Member Function Documentation

◆ available()

◆ available32()

◆ clearError()

◆ clearWriteError()

◆ close()

◆ contiguousRange()

◆ createContiguous() [1/2]

◆ createContiguous() [2/2]

◆ curCluster()

◆ curPosition()

◆ dirEntry()

◆ dirIndex()

◆ dirSize()

◆ dmpFile()

◆ exists()

◆ fgetpos()

◆ fgets()

◆ fileSize()

◆ firstBlock()

◆ firstSector()

◆ flush()

◆ fsetpos()

◆ getAccessDate()

◆ getAccessDateTime()

◆ getCreateDateTime()

◆ getError()

◆ getModifyDateTime()

◆ getName()

◆ getSFN()

◆ getWriteError()

◆ isContiguous()

◆ isDir()

◆ isFile()

◆ isHidden()

◆ isLFN()

◆ isOpen()

◆ isReadable()

◆ isReadOnly()

◆ isRoot()

◆ isRoot32()

◆ isRootFixed()

◆ isSubDir()

◆ isSystem()

◆ isWritable()

◆ legal83Char()

◆ ls() [1/2]

◆ ls() [2/2]

◆ mkdir()

◆ open() [1/4]

◆ open() [2/4]

◆ open() [3/4]

◆ open() [4/4]

◆ openNext()

◆ openRoot()

◆ operator bool()

◆ peek()

◆ preAllocate()

◆ printAccessDate()

◆ printAccessDateTime()

◆ printCreateDateTime()

◆ printFatDate()

◆ printFatTime()

◆ printField() [1/3]

◆ printField() [2/3]

◆ printField() [3/3]

◆ printFileSize()

◆ printModifyDateTime()

◆ printName() [1/2]

◆ printName() [2/2]

◆ printSFN()

◆ read() [1/2]

◆ read() [2/2]