A stream file class. More...

#include <yateclass.h>

Inheritance diagram for File:

Public Member Functions
	File ()
	File (HANDLE handle)
virtual	~File ()
virtual bool	openPath (const char *name, bool canWrite=false, bool canRead=true, bool create=false, bool append=false, bool binary=false, bool pubReadable=false, bool pubWritable=false)
virtual bool	terminate ()
void	attach (HANDLE handle)
HANDLE	detach ()
HANDLE	handle () const
virtual bool	canRetry () const
virtual bool	valid () const
virtual bool	setBlocking (bool block=true)
virtual int64_t	length ()
virtual int64_t	seek (SeekPos pos, int64_t offset=0)
virtual int	writeData (const void *buffer, int length)
virtual int	readData (void *buffer, int length)
bool	getFileTime (unsigned int &secEpoch)
virtual bool	md5 (String &buffer)
Static Public Member Functions
static HANDLE	invalidHandle ()
static bool	setFileTime (const char name, unsigned int secEpoch, int error=0)
static bool	getFileTime (const char name, unsigned int &secEpoch, int error=0)
static bool	exists (const char name, int error=0)
static bool	rename (const char oldFile, const char newFile, int *error=0)
static bool	remove (const char name, int error=0)
static bool	md5 (const char name, String &buffer, int error=0)
static bool	mkDir (const char path, int error=0)
static bool	rmDir (const char path, int error=0)
static bool	listDirectory (const char path, ObjList dirs, ObjList files, int error=0)
static bool	createPipe (File &reader, File &writer)
Protected Member Functions
void	copyError ()
Protected Attributes
HANDLE	m_handle

Detailed Description

A stream file class.

Class to encapsulate a system dependent file in a system independent abstraction

Constructor & Destructor Documentation

File ( )

Default constructor, creates a closed file

File ( HANDLE handle ) [explicit]

Constructor from an existing handle

Parameters:

handle Operating system handle to an open file

virtual ~File ( ) [virtual]

Destructor, closes the file

Member Function Documentation

void attach ( HANDLE handle )

Attach an existing handle to the file, closes any existing first

Parameters:

handle Operating system handle to an open file

virtual bool canRetry ( ) const [virtual]

Check if the last error code indicates a retryable condition

Returns:: True if error was temporary and operation should be retried

Reimplemented from Stream.

void copyError ( ) [protected]

Copy the last error code from the operating system

static bool createPipe	(	File &	reader,
		File &	writer
	)		`[static]`

Create a pair of unidirectionally pipe connected streams

Parameters:

reader	Reference to a File that becomes the reading side of the pipe
writer	Reference to a File that becomes the writing side of the pipe

Returns:: True is the pipe was created successfully

HANDLE detach ( )

Detaches the object from the file handle

Returns:: The handle previously owned by this object

static bool exists	(	const char *	name,
		int *	error = `0`
	)		`[static]`

Check if a file exists

Parameters:

name	The file to check
error	Optional pointer to error code to be filled on failure

Returns:: True if the file exists

bool getFileTime ( unsigned int & secEpoch )

Retrieve the file's modification time (the file must be already opened)

Parameters:

secEpoch File creation time (seconds since Epoch)

Returns:: True on success

static bool getFileTime	(	const char *	name,
		unsigned int &	secEpoch,
		int *	error = `0`
	)		`[static]`

Retrieve a file's modification time

Parameters:

name	Path and name of the file
secEpoch	File modification time (seconds since Epoch)
error	Optional pointer to error code to be filled on failure

Returns:: True on success

HANDLE handle ( ) const [inline]

Get the operating system handle to the file

Returns:: File handle

static HANDLE invalidHandle ( ) [static]

Get the operating system specific handle value for an invalid file

Returns:: Handle value for an invalid file

virtual int64_t length ( ) [virtual]

Find the length of the file if it has one

Returns:: Length of the file or zero if length is not defined

Reimplemented from Stream.

static bool listDirectory	(	const char *	path,
		ObjList *	dirs,
		ObjList *	files,
		int *	error = `0`
	)		`[static]`

Enumerate a folder (directory) content. Fill the given lists with children item names

Parameters:

path	The folder path
dirs	List to be filled with child directories. It can be NULL if not requested
files	List to be filled with child files. It can be NULL if not requested
error	Optional pointer to error code to be filled on failure

Returns:: True on success

virtual bool md5 ( String & buffer ) [virtual]

Build the MD5 hex digest of a file. The file must be opened for read access. This method will move the file pointer

Parameters:

buffer Destination buffer

Returns:: True on success

static bool md5	(	const char *	name,
		String &	buffer,
		int *	error = `0`
	)		`[static]`

Build the MD5 hex digest of a file.

Parameters:

name	The file to build MD5 from
buffer	Destination buffer
error	Optional pointer to error code to be filled on failure

Returns:: True on success

static bool mkDir	(	const char *	path,
		int *	error = `0`
	)		`[static]`

Create a folder (directory). It only creates the last directory in the path

Parameters:

path	The folder path
error	Optional pointer to error code to be filled on failure

Returns:: True on success

virtual bool openPath	(	const char *	name,
		bool	canWrite = `false`,
		bool	canRead = `true`,
		bool	create = `false`,
		bool	append = `false`,
		bool	binary = `false`,
		bool	pubReadable = `false`,
		bool	pubWritable = `false`
	)		`[virtual]`

Opens a file from the filesystem pathname

Parameters:

name	Name of the file according to the operating system's conventions
canWrite	Open the file for writing
canRead	Open the file for reading
create	Create the file if it doesn't exist
append	Set the write pointer at the end of an existing file
binary	Open the file in binary mode if applicable
pubReadable	If the file is created make it public readable
pubWritable	If the file is created make it public writable

Returns:: True if the file was successfully opened

virtual int readData	(	void *	buffer,
		int	length
	)		`[virtual]`

Read data from an open file

Parameters:

buffer	Buffer for data transfer
length	Length of the buffer

Returns:: Number of bytes transferred, negative if an error occurred

Implements Stream.

static bool remove	(	const char *	name,
		int *	error = `0`
	)		`[static]`

Deletes a file entry from the filesystem

Parameters:

name	Absolute path and name of the file to delete
error	Optional pointer to error code to be filled on failure

Returns:: True if the file was successfully deleted

static bool rename	(	const char *	oldFile,
		const char *	newFile,
		int *	error = `0`
	)		`[static]`

Rename (move) a file (or directory) entry from the filesystem

Parameters:

oldFile	Path and name of the file to rename
newFile	The new path and name of the file
error	Optional pointer to error code to be filled on failure

Returns:: True if the file was successfully renamed (moved)

static bool rmDir	(	const char *	path,
		int *	error = `0`
	)		`[static]`

Remove an empty folder (directory)

Parameters:

path	The folder path
error	Optional pointer to error code to be filled on failure

Returns:: True on success

virtual int64_t seek	(	SeekPos	pos,
		int64_t	offset = `0`
	)		`[virtual]`

Set the file read/write pointer

Parameters:

pos	The seek start as enumeration
offset	The number of bytes to move the pointer from starting position

Returns:: The new position of the file read/write pointer. Negative on failure

Reimplemented from Stream.

virtual bool setBlocking ( bool block = true ) [virtual]

Set the blocking or non-blocking operation mode of the file

Parameters:

block True if I/O operations should block, false for non-blocking

Returns:: True if operation was successfull, false if an error occured

Reimplemented from Stream.

static bool setFileTime	(	const char *	name,
		unsigned int	secEpoch,
		int *	error = `0`
	)		`[static]`

Set a file's modification time.

Parameters:

name	Path and name of the file
secEpoch	File modification time (seconds since Epoch)
error	Optional pointer to error code to be filled on failure

Returns:: True on success

virtual bool terminate ( ) [virtual]

Closes the file handle

Returns:: True if the file was (already) closed, false if an error occured

Implements Stream.

virtual bool valid ( ) const [virtual]

Check if this file is valid

Returns:: True if the file is valid, false if it's invalid or closed

Implements Stream.

virtual int writeData	(	const void *	buffer,
		int	length
	)		`[virtual]`

Write data to an open file

Parameters:

buffer	Buffer for data transfer
length	Length of the buffer

Returns:: Number of bytes transferred, negative if an error occurred

Implements Stream.

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

yateclass.h

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation