juce::FileInputStream Class Reference

Detailed Description

An input stream that reads from a local file.

See also

InputStream, FileOutputStream, File::createInputStream

Inheritance diagram for juce::FileInputStream:

Public Member Functions
	FileInputStream (const File &fileToRead)
	Creates a FileInputStream to read from the given file.
	~FileInputStream () override
	Destructor.
const File &	getFile () const noexcept
	Returns the file that this stream is reading from.
const Result &	getStatus () const noexcept
	Returns the status of the file stream.
bool	failedToOpen () const noexcept
	Returns true if the stream couldn't be opened for some reason.
bool	openedOk () const noexcept
	Returns true if the stream opened without problems.
int64	getTotalLength () override
	Returns the total number of bytes available for reading in this stream.
int	read (void *, int) override
	Reads some data from the stream into a memory buffer.
bool	isExhausted () override
	Returns true if the stream has no more data to read.
int64	getPosition () override
	Returns the offset of the next byte that will be read from the stream.
bool	setPosition (int64) override
	Tries to move the current read position of the stream.
Public Member Functions inherited from juce::InputStream
virtual	~InputStream ()=default
	Destructor.
int64	getNumBytesRemaining ()
	Returns the number of bytes available for reading, or a negative value if the remaining length is not known.
ssize_t	read (void *destBuffer, size_t maxBytesToRead)
virtual char	readByte ()
	Reads a byte from the stream.
virtual bool	readBool ()
	Reads a boolean from the stream.
virtual short	readShort ()
	Reads two bytes from the stream as a little-endian 16-bit value.
virtual short	readShortBigEndian ()
	Reads two bytes from the stream as a little-endian 16-bit value.
virtual int	readInt ()
	Reads four bytes from the stream as a little-endian 32-bit value.
virtual int	readIntBigEndian ()
	Reads four bytes from the stream as a big-endian 32-bit value.
virtual int64	readInt64 ()
	Reads eight bytes from the stream as a little-endian 64-bit value.
virtual int64	readInt64BigEndian ()
	Reads eight bytes from the stream as a big-endian 64-bit value.
virtual float	readFloat ()
	Reads four bytes as a 32-bit floating point value.
virtual float	readFloatBigEndian ()
	Reads four bytes as a 32-bit floating point value.
virtual double	readDouble ()
	Reads eight bytes as a 64-bit floating point value.
virtual double	readDoubleBigEndian ()
	Reads eight bytes as a 64-bit floating point value.
virtual int	readCompressedInt ()
	Reads an encoded 32-bit number from the stream using a space-saving compressed format.
virtual String	readNextLine ()
	Reads a UTF-8 string from the stream, up to the next linefeed or carriage return.
virtual String	readString ()
	Reads a zero-terminated UTF-8 string from the stream.
virtual String	readEntireStreamAsString ()
	Tries to read the whole stream and turn it into a string.
virtual size_t	readIntoMemoryBlock (MemoryBlock &destBlock, ssize_t maxNumBytesToRead=-1)
	Reads from the stream and appends the data to a MemoryBlock.
virtual void	skipNextBytes (int64 numBytesToSkip)
	Reads and discards a number of bytes from the stream.

Additional Inherited Members
Protected Member Functions inherited from juce::InputStream
	InputStream ()=default

Constructors and Destructors

FileInputStream()

juce::FileInputStream::FileInputStream ( const File & fileToRead )

explicit

Creates a FileInputStream to read from the given file.

After creating a FileInputStream, you should use openedOk() or failedToOpen() to make sure that it's OK before trying to read from it! If it failed, you can call getStatus() to get more error information.

~FileInputStream()

juce::FileInputStream::~FileInputStream ( )

override

Destructor.

Member Functions

getFile()

const File & juce::FileInputStream::getFile ( ) const

noexcept

Returns the file that this stream is reading from.

getStatus()

const Result & juce::FileInputStream::getStatus ( ) const

noexcept

Returns the status of the file stream.

The result will be ok if the file opened successfully. If an error occurs while opening or reading from the file, this will contain an error message.

failedToOpen()

bool juce::FileInputStream::failedToOpen ( ) const

noexcept

Returns true if the stream couldn't be opened for some reason.

See also

getResult()

openedOk()

bool juce::FileInputStream::openedOk ( ) const

noexcept

Returns true if the stream opened without problems.

See also

getResult()

getTotalLength()

int64 juce::FileInputStream::getTotalLength ( )

overridevirtual

Returns the total number of bytes available for reading in this stream.

Note that this is the number of bytes available from the start of the stream, not from the current position.

If the size of the stream isn't actually known, this will return -1.

See also

getNumBytesRemaining

Implements juce::InputStream.

read()

int juce::FileInputStream::read ( void * destBuffer, int maxBytesToRead )

overridevirtual

Reads some data from the stream into a memory buffer.

This is the only read method that subclasses actually need to implement, as the InputStream base class implements the other read methods in terms of this one (although it's often more efficient for subclasses to implement them directly).

Parameters

destBuffer	the destination buffer for the data. This must not be null.
maxBytesToRead	the maximum number of bytes to read - make sure the memory block passed in is big enough to contain this many bytes. This value must not be negative.

Returns

the actual number of bytes that were read, which may be less than maxBytesToRead if the stream is exhausted before it gets that far

Implements juce::InputStream.

isExhausted()

bool juce::FileInputStream::isExhausted ( )

overridevirtual

Returns true if the stream has no more data to read.

Implements juce::InputStream.

getPosition()

int64 juce::FileInputStream::getPosition ( )

overridevirtual

Returns the offset of the next byte that will be read from the stream.

See also

setPosition

Implements juce::InputStream.

setPosition()

bool juce::FileInputStream::setPosition ( int64 newPosition )

overridevirtual

Tries to move the current read position of the stream.

The position is an absolute number of bytes from the stream's start.

Some streams might not be able to do this, in which case they should do nothing and return false. Others might be able to manage it by resetting themselves and skipping to the correct position, although this is obviously a bit slow.

Returns

true if the stream manages to reposition itself correctly

See also

getPosition

Implements juce::InputStream.