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• sf
• FileInputStream

Public Member Functions | List of all members

sf::FileInputStream Class Reference

System module

Implementation of input stream based on a file. More...

#include <SFML/System/FileInputStream.hpp>

Inheritance diagram for sf::FileInputStream:

Public Member Functions
	FileInputStream ()
	Default constructor.
	~FileInputStream () override
	Default destructor.
	FileInputStream (const FileInputStream &)=delete
	Deleted copy constructor.
FileInputStream &	operator= (const FileInputStream &)=delete
	Deleted copy assignment.
	FileInputStream (FileInputStream &&) noexcept
	Move constructor.
FileInputStream &	operator= (FileInputStream &&) noexcept
	Move assignment.
	FileInputStream (const std::filesystem::path &filename)
	Construct the stream from a file path.
bool	open (const std::filesystem::path &filename)
	Open the stream from a file path.
std::optional< std::size_t >	read (void *data, std::size_t size) override
	Read data from the stream.
std::optional< std::size_t >	seek (std::size_t position) override
	Change the current reading position.
std::optional< std::size_t >	tell () override
	Get the current reading position in the stream.
std::optional< std::size_t >	getSize () override
	Return the size of the stream.

Detailed Description

Implementation of input stream based on a file.

This class is a specialization of InputStream that reads from a file on disk.

It wraps a file in the common InputStream interface and therefore allows to use generic classes or functions that accept such a stream, with a file on disk as the data source.

In addition to the virtual functions inherited from InputStream, FileInputStream adds a function to specify the file to open.

SFML resource classes can usually be loaded directly from a filename, so this class shouldn't be useful to you unless you create your own algorithms that operate on an InputStream.

Usage example:

void process(InputStream& stream);

std::optional stream = sf::FileInputStream::open("some_file.dat");

if (stream)

process(*stream);

sf::FileInputStream::open

bool open(const std::filesystem::path &filename)

Open the stream from a file path.

sf::InputStream

Abstract class for custom file input streams.

Definition InputStream.hpp:46

See also

InputStream, MemoryInputStream

Definition at line 56 of file FileInputStream.hpp.

Constructor & Destructor Documentation

◆ FileInputStream() [1/4]

sf::FileInputStream::FileInputStream

(

)

Default constructor.

Construct a file input stream that is not associated with a file to read.

◆ ~FileInputStream()

sf::FileInputStream::~FileInputStream ( )

override

Default destructor.

◆ FileInputStream() [2/4]

sf::FileInputStream::FileInputStream ( const FileInputStream & )

delete

Deleted copy constructor.

◆ FileInputStream() [3/4]

sf::FileInputStream::FileInputStream ( FileInputStream && )

noexcept

Move constructor.

◆ FileInputStream() [4/4]

sf::FileInputStream::FileInputStream ( const std::filesystem::path & filename )

explicit

Construct the stream from a file path.

Parameters

filename

Name of the file to open

Exceptions

`sf::Exception`

on error

Member Function Documentation

◆ getSize()

std::optional< std::size_t > sf::FileInputStream::getSize ( )

overridevirtual

Return the size of the stream.

Returns

The total number of bytes available in the stream, or std::nullopt on error

Implements sf::InputStream.

◆ open()

bool sf::FileInputStream::open ( const std::filesystem::path & filename )

nodiscard

Open the stream from a file path.

Parameters

filename

Name of the file to open

Returns

true on success, false on error

◆ operator=() [1/2]

FileInputStream & sf::FileInputStream::operator= ( const FileInputStream & )

delete

Deleted copy assignment.

◆ operator=() [2/2]

FileInputStream & sf::FileInputStream::operator= ( FileInputStream && )

noexcept

Move assignment.

◆ read()

std::optional< std::size_t > sf::FileInputStream::read ( void * data, std::size_t size )

nodiscardoverridevirtual

Read data from the stream.

After reading, the stream's reading position must be advanced by the amount of bytes read.

Parameters

data	Buffer where to copy the read data
size	Desired number of bytes to read

Returns

The number of bytes actually read, or std::nullopt on error

Implements sf::InputStream.

◆ seek()

std::optional< std::size_t > sf::FileInputStream::seek ( std::size_t position )

nodiscardoverridevirtual

Change the current reading position.

Parameters

position

The position to seek to, from the beginning

Returns

The position actually sought to, or std::nullopt on error

Implements sf::InputStream.

◆ tell()

std::optional< std::size_t > sf::FileInputStream::tell ( )

nodiscardoverridevirtual

Get the current reading position in the stream.

Returns

The current position, or std::nullopt on error.

Implements sf::InputStream.

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

• FileInputStream.hpp