Gio::OutputStream Class Reference

Base class for implementing streaming output. More...

#include <giomm/outputstream.h>

Inheritance diagram for Gio::OutputStream:

Public Types
enum class	SpliceFlags {   NONE = 0x0 ,   CLOSE_SOURCE = (1 << 0) ,   CLOSE_TARGET = (1 << 1) }
Public Types inherited from Glib::Object
using	DestroyNotify = void(*)(gpointer data)

Public Member Functions
	OutputStream (OutputStream &&src) noexcept
OutputStream &	operator= (OutputStream &&src) noexcept
	~OutputStream () noexcept override
GOutputStream *	gobj ()
	Provides access to the underlying C GObject.
const GOutputStream *	gobj () const
	Provides access to the underlying C GObject.
GOutputStream *	gobj_copy ()
	Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
gssize	write (const void *buffer, gsize count, const Glib::RefPtr< Cancellable > &cancellable)
	Tries to write count bytes from buffer into the stream.
gssize	write (const void *buffer, gsize count)
	A write() convenience overload.
gssize	write (const std::string &buffer, const Glib::RefPtr< Cancellable > &cancellable)
	Tries to write count bytes from buffer into the stream.
gssize	write (const std::string &buffer)
	Tries to write count bytes from buffer into the stream.
bool	write_all (const void *buffer, gsize count, gsize &bytes_written, const Glib::RefPtr< Cancellable > &cancellable)
	Tries to write count bytes from buffer into the stream.
bool	write_all (const void *buffer, gsize count, gsize &bytes_written)
	A write_all() convenience overload.
bool	write_all (const std::string &buffer, gsize &bytes_written, const Glib::RefPtr< Cancellable > &cancellable)
	Tries to write count bytes from buffer into the stream.
bool	write_all (const std::string &buffer, gsize &bytes_written)
	Tries to write count bytes from buffer into the stream.
gssize	write_bytes (const Glib::RefPtr< const Glib::Bytes > & bytes, const Glib::RefPtr< Cancellable > &cancellable)
	A wrapper function for g_output_stream_write() which takes a Bytes as input.
gssize	write_bytes (const Glib::RefPtr< const Glib::Bytes > & bytes)
	A write_bytes() convenience overload.
void	write_bytes_async (const Glib::RefPtr< const Glib::Bytes > & bytes, const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable, int io_priority=Glib::PRIORITY_DEFAULT)
	Request an asynchronous write of the data in bytes to the stream.
void	write_bytes_async (const Glib::RefPtr< const Glib::Bytes > & bytes, const SlotAsyncReady &slot, int io_priority=Glib::PRIORITY_DEFAULT)
	Request an asynchronous write of the data in bytes to the stream.
gssize	write_bytes_finish (const Glib::RefPtr< AsyncResult > &result)
	Finishes a stream write-from-Bytes operation.
gssize	splice (const Glib::RefPtr< InputStream > &source, const Glib::RefPtr< Cancellable > &cancellable, SpliceFlags flags=SpliceFlags::NONE)
	Splices an input stream into an output stream.
gssize	splice (const Glib::RefPtr< InputStream > &source, SpliceFlags flags=SpliceFlags::NONE)
	Splices an input stream into an output stream.
bool	flush (const Glib::RefPtr< Cancellable > &cancellable)
	Flushed any outstanding buffers in the stream.
bool	flush ()
	A flush() convenience overload.
bool	close (const Glib::RefPtr< Cancellable > &cancellable)
	Closes the stream, releasing resources related to it.
bool	close ()
	A close() convenience overload.
void	write_async (const void *buffer, gsize count, const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable, int io_priority=Glib::PRIORITY_DEFAULT)
	Request an asynchronous write of count bytes from buffer into the stream.
void	write_async (const void *buffer, gsize count, const SlotAsyncReady &slot, int io_priority=Glib::PRIORITY_DEFAULT)
	Request an asynchronous write of count bytes from buffer into the stream.
gssize	write_finish (const Glib::RefPtr< AsyncResult > &result)
	Finishes a stream write operation.
void	write_all_async (const void *buffer, gsize count, const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable, int io_priority=Glib::PRIORITY_DEFAULT)
	Request an asynchronous write of count bytes from buffer into the stream.
void	write_all_async (const void *buffer, gsize count, const SlotAsyncReady &slot, int io_priority=Glib::PRIORITY_DEFAULT)
	Request an asynchronous write of count bytes from buffer into the stream.
bool	write_all_finish (const Glib::RefPtr< AsyncResult > &result, gsize &bytes_written)
	Finishes an asynchronous stream write operation started with g_output_stream_write_all_async().
void	splice_async (const Glib::RefPtr< InputStream > &source, const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable, SpliceFlags flags=SpliceFlags::NONE, int io_priority=Glib::PRIORITY_DEFAULT)
	Splices a stream asynchronously.
void	splice_async (const Glib::RefPtr< InputStream > &source, const SlotAsyncReady &slot, SpliceFlags flags=SpliceFlags::NONE, int io_priority=Glib::PRIORITY_DEFAULT)
	Splices a stream asynchronously.
gssize	splice_finish (const Glib::RefPtr< AsyncResult > &result)
	Finishes an asynchronous stream splice operation.
void	flush_async (const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable, int io_priority=Glib::PRIORITY_DEFAULT)
	Flushes a stream asynchronously.
void	flush_async (const SlotAsyncReady &slot, int io_priority=Glib::PRIORITY_DEFAULT)
	Flushes a stream asynchronously.
bool	flush_finish (const Glib::RefPtr< AsyncResult > &result)
	Finishes flushing an output stream.
void	close_async (const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable, int io_priority=Glib::PRIORITY_DEFAULT)
	Requests an asynchronous close of the stream, releasing resources related to it.
void	close_async (const SlotAsyncReady &slot, int io_priority=Glib::PRIORITY_DEFAULT)
	Requests an asynchronous close of the stream, releasing resources related to it.
bool	close_finish (const Glib::RefPtr< AsyncResult > &result)
	Closes an output stream.
bool	is_closed () const
	Checks if an output stream has already been closed.
bool	is_closing () const
	Checks if an output stream is being closed.
bool	has_pending () const
	Checks if an output stream has pending actions.
Public Member Functions inherited from Glib::Object
	Object (const Object &)=delete
Object &	operator= (const Object &)=delete
	Object (Object &&src) noexcept
Object &	operator= (Object &&src) noexcept
void *	get_data (const QueryQuark & key)
void	set_data (const Quark & key, void *data)
void	set_data_with_c_callback (const Quark & key, void *data, GDestroyNotify notify)
void	set_data (const Quark & key, void *data, DestroyNotify notify)
	Prefer set_data_with_c_callback() with a callback with C linkage.
void	remove_data (const QueryQuark &quark)
void *	steal_data (const QueryQuark &quark)
Public Member Functions inherited from Glib::ObjectBase
	ObjectBase (const ObjectBase &)=delete
ObjectBase &	operator= (const ObjectBase &)=delete
void	set_property_value (const Glib::ustring & property_name, const Glib::ValueBase & value)
	You probably want to use a specific property_*() accessor method instead.
void	get_property_value (const Glib::ustring & property_name, Glib::ValueBase & value) const
	You probably want to use a specific property_*() accessor method instead.
template<class PropertyType >
void	set_property (const Glib::ustring & property_name, const PropertyType & value)
	You probably want to use a specific property_*() accessor method instead.
template<class PropertyType >
void	get_property (const Glib::ustring & property_name, PropertyType & value) const
	You probably want to use a specific property_*() accessor method instead.
template<class PropertyType >
PropertyType	get_property (const Glib::ustring & property_name) const
	You probably want to use a specific property_*() accessor method instead.
sigc::connection	connect_property_changed (const Glib::ustring & property_name, const sigc::slot< void()> &slot)
	You can use the signal_changed() signal of the property proxy instead.
sigc::connection	connect_property_changed (const Glib::ustring & property_name, sigc::slot< void()> &&slot)
	You can use the signal_changed() signal of the property proxy instead.
void	freeze_notify ()
	Increases the freeze count on object.
void	thaw_notify ()
	Reverts the effect of a previous call to freeze_notify().
virtual void	reference () const
	Increment the reference count for this object.
virtual void	unreference () const
	Decrement the reference count for this object.
GObject *	gobj ()
	Provides access to the underlying C GObject.
const GObject *	gobj () const
	Provides access to the underlying C GObject.
GObject *	gobj_copy () const
	Give a ref-ed copy to someone. Use for direct struct access.

Static Public Member Functions
static GType	get_type ()
	Get the GType for this class, for use with the underlying GObject type system.

Protected Member Functions
	OutputStream ()
bool	set_pending ()
	Sets stream to have actions pending.
void	clear_pending ()
	Clears the pending flag on stream.
virtual gssize	write_vfunc (const void *buffer, gsize count, const Glib::RefPtr< Cancellable > &cancellable)
virtual gssize	splice_vfunc (const Glib::RefPtr< InputStream > &source, const Glib::RefPtr< Cancellable > &cancellable, SpliceFlags flags)
virtual bool	flush_vfunc (const Glib::RefPtr< Cancellable > &cancellable)
virtual bool	close_vfunc (const Glib::RefPtr< Cancellable > &cancellable)
Protected Member Functions inherited from Glib::Object
	Object ()
	Object (const Glib::ConstructParams &construct_params)
	Object (GObject *castitem)
	~Object () noexcept override
Protected Member Functions inherited from Glib::ObjectBase
	ObjectBase ()
	This default constructor is called implicitly from the constructor of user-derived classes, even if, for instance, Gtk::Button calls a different ObjectBase constructor.
	ObjectBase (const char *custom_type_name)
	A derived constructor always overrides this choice.
	ObjectBase (const std::type_info &custom_type_info)
	This constructor is a special feature to allow creation of derived types on the fly, without having to use g_object_new() manually.
	ObjectBase (ObjectBase &&src) noexcept
ObjectBase &	operator= (ObjectBase &&src) noexcept
virtual	~ObjectBase () noexcept=0
void	initialize (GObject *castitem)
void	initialize_move (GObject *castitem, Glib::ObjectBase *previous_wrapper)

Related Symbols
(Note that these are not member symbols.)
Glib::RefPtr< Gio::OutputStream >	wrap (GOutputStream *object, bool take_copy=false)
	A Glib::wrap() method for this object.
Related Symbols inherited from Glib::Object
Glib::RefPtr< Glib::Object >	wrap (GObject *object, bool take_copy=false)

Detailed Description

Base class for implementing streaming output.

Since glibmm 2.16:

Member Enumeration Documentation

SpliceFlags

enum class Gio::OutputStream::SpliceFlags

strong

Enumerator
NONE	Do not close either stream.
CLOSE_SOURCE	Close the source stream after the splice.
CLOSE_TARGET	Close the target stream after the splice.

Constructor & Destructor Documentation

OutputStream() [1/2]

Gio::OutputStream::OutputStream ( OutputStream &&  src )

noexcept

~OutputStream()

Gio::OutputStream::~OutputStream ( )

overridenoexcept

OutputStream() [2/2]

Gio::OutputStream::OutputStream ( )

protected

Member Function Documentation

clear_pending()

void Gio::OutputStream::clear_pending ( )

protected

Clears the pending flag on stream.

Since glibmm 2.50:

close() [1/2]

bool Gio::OutputStream::close

(

)

A close() convenience overload.

close() [2/2]

bool Gio::OutputStream::close

(

const Glib::RefPtr< Cancellable > &

cancellable

)

Closes the stream, releasing resources related to it.

Once the stream is closed, all other operations will throw a Gio::Error with CLOSED. Closing a stream multiple times will not cause an error to be thrown.

Closing a stream will automatically flush any outstanding buffers in the stream.

Streams will be automatically closed when the last reference is dropped, but you might want to call this function to make sure resources are released as early as possible.

Some streams might keep the backing store of the stream (e.g. a file descriptor) open after the stream is closed. See the documentation for the individual stream for details.

On failure the first error that happened will be reported, but the close operation will finish as much as possible. A stream that failed to close will still throw a Gio::Error with CLOSED for all operations. Still, it is important to check and report the error to the user, otherwise there might be a loss of data as all data might not be written.

The operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, a Gio::Error will be thrown with CANCELLED. Cancelling a close will still leave the stream closed, but there some streams can use a faster close that doesn't block to e.g. check errors. On cancellation (as with any error) there is no guarantee that all written data will reach the target.

Parameters

cancellable

Cancellable object.

Returns

true on success, false on failure.

Exceptions

Glib::Error

close_async() [1/2]

void Gio::OutputStream::close_async	(	const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Requests an asynchronous close of the stream, releasing resources related to it.

When the operation is finished the slot will be called, giving the results. You can then call close_finish() to get the result of the operation. For behaviour details see close().

The asyncronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

Parameters

slot	Callback slot to call when the request is satisfied.
cancellable	Cancellable object.
io_priority	The io priority of the request.

close_async() [2/2]

void Gio::OutputStream::close_async	(	const SlotAsyncReady &	slot,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Requests an asynchronous close of the stream, releasing resources related to it.

When the operation is finished the slot will be called, giving the results. You can then call close_finish() to get the result of the operation. For behaviour details see close().

The asyncronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

Parameters

slot	Callback slot to call when the request is satisfied.
io_priority	The io priority of the request.

close_finish()

bool Gio::OutputStream::close_finish

(

const Glib::RefPtr< AsyncResult > &

result

)

Closes an output stream.

Parameters

result

A AsyncResult.

Returns

true if stream was successfully closed, false otherwise.

Exceptions

Glib::Error

close_vfunc()

virtual bool Gio::OutputStream::close_vfunc ( const Glib::RefPtr< Cancellable > &  cancellable )

protectedvirtual

Exceptions

Glib::Error.

flush() [1/2]

bool Gio::OutputStream::flush

(

)

A flush() convenience overload.

flush() [2/2]

bool Gio::OutputStream::flush

(

const Glib::RefPtr< Cancellable > &

cancellable

)

Flushed any outstanding buffers in the stream.

Will block during the operation. Closing the stream will implicitly cause a flush.

This function is optional for inherited classes.

The operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, a Gio::Error will be thrown with CANCELLED.

Parameters

cancellable

Cancellable object.

Returns

true on success, false on error.

Exceptions

Glib::Error

flush_async() [1/2]

void Gio::OutputStream::flush_async	(	const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Flushes a stream asynchronously.

When the operation is finished the slot will be called, giving the results. You can then call flush_finish() to get the result of the operation. For behaviour details see flush().

Parameters

slot	Callback slot to call when the request is satisfied.
cancellable	Cancellable object.
io_priority	The io priority of the request.

flush_async() [2/2]

void Gio::OutputStream::flush_async	(	const SlotAsyncReady &	slot,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Flushes a stream asynchronously.

When the operation is finished the slot will be called, giving the results. You can then call flush_finish() to get the result of the operation. For behaviour details see flush().

Parameters

slot	Callback slot to call when the request is satisfied.
io_priority	The io priority of the request.

flush_finish()

bool Gio::OutputStream::flush_finish

(

const Glib::RefPtr< AsyncResult > &

result

)

Finishes flushing an output stream.

Parameters

result

A GAsyncResult.

Returns

true if flush operation succeeded, false otherwise.

Exceptions

Glib::Error

flush_vfunc()

virtual bool Gio::OutputStream::flush_vfunc ( const Glib::RefPtr< Cancellable > &  cancellable )

protectedvirtual

Exceptions

Glib::Error.

get_type()

static GType Gio::OutputStream::get_type ( )

static

Get the GType for this class, for use with the underlying GObject type system.

gobj() [1/2]

GOutputStream * Gio::OutputStream::gobj ( )

inline

Provides access to the underlying C GObject.

gobj() [2/2]

const GOutputStream * Gio::OutputStream::gobj ( ) const

inline

Provides access to the underlying C GObject.

gobj_copy()

GOutputStream * Gio::OutputStream::gobj_copy

(

)

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

has_pending()

bool Gio::OutputStream::has_pending

(

)

const

Checks if an output stream has pending actions.

Since glibmm 2.50:

Returns

true if stream has pending actions.

is_closed()

bool Gio::OutputStream::is_closed

(

)

const

Checks if an output stream has already been closed.

Since glibmm 2.50:

Returns

true if stream is closed. false otherwise.

is_closing()

bool Gio::OutputStream::is_closing

(

)

const

Checks if an output stream is being closed.

This can be used inside e.g. a flush implementation to see if the flush (or other i/o operation) is called from within the closing operation.

Since glibmm 2.50:

Returns

true if stream is being closed. false otherwise.

operator=()

OutputStream & Gio::OutputStream::operator= ( OutputStream &&  src )

noexcept

set_pending()

bool Gio::OutputStream::set_pending ( )

protected

Sets stream to have actions pending.

If the pending flag is already set or stream is closed, it will return false and set error.

Since glibmm 2.50:

Returns

true if pending was previously unset and is now set.

Exceptions

Glib::Error

splice() [1/2]

gssize Gio::OutputStream::splice	(	const Glib::RefPtr< InputStream > &	source,
		const Glib::RefPtr< Cancellable > &	cancellable,
		SpliceFlags	flags = SpliceFlags::NONE
	)

Splices an input stream into an output stream.

Parameters

source	An InputStream.
flags	A set of SpliceFlags.
cancellable	A Cancellable object. ignore.

Returns

A gssize containing the size of the data spliced.

splice() [2/2]

gssize Gio::OutputStream::splice	(	const Glib::RefPtr< InputStream > &	source,
		SpliceFlags	flags = SpliceFlags::NONE
	)

Splices an input stream into an output stream.

Parameters

source	An InputStream.
flags	A set of SpliceFlags. ignore.

Returns

A gssize containing the size of the data spliced.

splice_async() [1/2]

void Gio::OutputStream::splice_async	(	const Glib::RefPtr< InputStream > &	source,
		const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable,
		SpliceFlags	flags = SpliceFlags::NONE,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Splices a stream asynchronously.

When the operation is finished slot will be called. You can then call splice_finish() to get the result of the operation.

For the synchronous, blocking version of this function, see splice().

Parameters

source	An InputStream.
slot	Callback slot to call when the request is satisfied.
cancellable	Cancellable object.
flags	A set of SpliceFlags.
io_priority	The io priority of the request.

splice_async() [2/2]

void Gio::OutputStream::splice_async	(	const Glib::RefPtr< InputStream > &	source,
		const SlotAsyncReady &	slot,
		SpliceFlags	flags = SpliceFlags::NONE,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Splices a stream asynchronously.

When the operation is finished slot will be called. You can then call splice_finish() to get the result of the operation.

For the synchronous, blocking version of this function, see splice().

Parameters

source	An InputStream.
slot	Callback slot to call when the request is satisfied.
flags	A set of SpliceFlags.
io_priority	The io priority of the request.

splice_finish()

gssize Gio::OutputStream::splice_finish

(

const Glib::RefPtr< AsyncResult > &

result

)

Finishes an asynchronous stream splice operation.

Parameters

result

A AsyncResult.

Returns

A gssize of the number of bytes spliced. Note that if the number of bytes spliced is greater than G_MAXSSIZE, then that will be returned, and there is no way to determine the actual number of bytes spliced.

Exceptions

Glib::Error

splice_vfunc()

virtual gssize Gio::OutputStream::splice_vfunc ( const Glib::RefPtr< InputStream > &  source, const Glib::RefPtr< Cancellable > &  cancellable, SpliceFlags  flags  )

protectedvirtual

Exceptions

Glib::Error.

write() [1/4]

gssize Gio::OutputStream::write

(

const std::string &

buffer

)

Tries to write count bytes from buffer into the stream.

Will block during the operation.

If string that is larger than MAXSSIZE bytes will cause a Gio::Error with INVALID_ARGUMENT to be thrown.

On success, the number of bytes written to the stream is returned. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial i/o error, or if the there is not enough storage in the stream. All writes either block until at least one byte is written, so zero is never returned (unless count is zero).

On error -1 is returned.

Parameters

buffer

The buffer containing the data to write.

Returns

Number of bytes written, or -1 on error.

write() [2/4]

gssize Gio::OutputStream::write	(	const std::string &	buffer,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Tries to write count bytes from buffer into the stream.

Will block during the operation.

If count is zero returns zero and does nothing. A value of count larger than MAXSSIZE will cause a Gio::Error with INVALID_ARGUMENT to be thrown.

On success, the number of bytes written to the stream is returned. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial i/o error, or if the there is not enough storage in the stream. All writes either block until at least one byte is written, so zero is never returned (unless count is zero).

On error -1 is returned.

Parameters

buffer	The buffer containing the data to write.
cancellable	Cancellable object.

Returns

Number of bytes written, or -1 on error.

write() [3/4]

gssize Gio::OutputStream::write	(	const void *	buffer,
		gsize	count
	)

A write() convenience overload.

write() [4/4]

gssize Gio::OutputStream::write	(	const void *	buffer,
		gsize	count,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Tries to write count bytes from buffer into the stream.

Will block during the operation.

If count is zero returns zero and does nothing. A value of count larger than G_MAXSSIZE will cause a Gio::Error with INVALID_ARGUMENT to be thrown.

On success, the number of bytes written to the stream is returned. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial i/o error, or if there is not enough storage in the stream. All writes either block until at least one byte is written, so zero is never returned (unless count is zero).

The operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, a Gio::Error will be thrown with CANCELLED. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error.

Parameters

buffer	The buffer containing the data to write.
count	The number of bytes to write.
cancellable	Cancellable object.

Returns

Number of bytes written, or -1 on error.

Exceptions

Glib::Error

write_all() [1/4]

bool Gio::OutputStream::write_all	(	const std::string &	buffer,
		gsize &	bytes_written
	)

Tries to write count bytes from buffer into the stream.

Will block during the operation.

This function is similar to write(), except it tries to write as many bytes as requested, only stopping on an error.

On a successful write of count bytes, true is returned, and bytes_written is set to count .

If there is an error during the operation false is returned and error is set to indicate the error status, bytes_written is updated to contain the number of bytes written into the stream before the error occured.

Parameters

buffer	The buffer containing the data to write.
bytes_written	Location to store the number of bytes that was written to the stream.

Returns

true on success, false if there was an error.

write_all() [2/4]

bool Gio::OutputStream::write_all	(	const std::string &	buffer,
		gsize &	bytes_written,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Tries to write count bytes from buffer into the stream.

Will block during the operation.

This function is similar to write(), except it tries to write as many bytes as requested, only stopping on an error.

On a successful write of count bytes, true is returned, and bytes_written is set to count .

If there is an error during the operation false is returned and error is set to indicate the error status, bytes_written is updated to contain the number of bytes written into the stream before the error occured.

Parameters

buffer	The buffer containing the data to write.
bytes_written	Location to store the number of bytes that was written to the stream.
cancellable	Cancellable object.

Returns

true on success, false if there was an error.

write_all() [3/4]

bool Gio::OutputStream::write_all	(	const void *	buffer,
		gsize	count,
		gsize &	bytes_written
	)

A write_all() convenience overload.

write_all() [4/4]

bool Gio::OutputStream::write_all	(	const void *	buffer,
		gsize	count,
		gsize &	bytes_written,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Tries to write count bytes from buffer into the stream.

Will block during the operation.

This function is similar to g_output_stream_write(), except it tries to write as many bytes as requested, only stopping on an error.

On a successful write of count bytes, true is returned, and bytes_written is set to count.

If there is an error during the operation false is returned and error is set to indicate the error status.

As a special exception to the normal conventions for functions that use Error, if this function returns false (and sets error) then bytes_written will be set to the number of bytes that were successfully written before the error was encountered. This functionality is only available from C. If you need it from another language then you must write your own loop around g_output_stream_write().

Parameters

buffer	The buffer containing the data to write.
count	The number of bytes to write.
bytes_written	Location to store the number of bytes that was written to the stream.
cancellable	Optional Cancellable object, nullptr to ignore.

Returns

true on success, false if there was an error.

Exceptions

Glib::Error

write_all_async() [1/2]

void Gio::OutputStream::write_all_async	(	const void *	buffer,
		gsize	count,
		const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Request an asynchronous write of count bytes from buffer into the stream.

When the operation is finished slot will be called. You can then call write_all_finish() to get the result of the operation.

This is the asynchronous version of write_all().

During an async request no other sync and async calls are allowed, and will result in Gio::Error with PENDING being thrown.

A value of count larger than MAXSSIZE will cause a Gio::Error with INVALID_ARGUMENT to be thrown.

On success, the number of bytes written will be passed to the callback slot. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, but generally we try to write as many bytes as requested.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is Glib::PRIORITY_DEFAULT.

The asyncronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

For the synchronous, blocking version of this function, see write().

Note that no copy of buffer will be made, so it must stay valid until slot is called.

Parameters

buffer	The buffer containing the data to write.
count	The number of bytes to write
slot	Callback slot to call when the request is satisfied.
cancellable	Cancellable object.
io_priority	The io priority of the request.

write_all_async() [2/2]

void Gio::OutputStream::write_all_async	(	const void *	buffer,
		gsize	count,
		const SlotAsyncReady &	slot,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Request an asynchronous write of count bytes from buffer into the stream.

When the operation is finished slot will be called. You can then call write_finish() to get the result of the operation.

This is the asynchronous version of write_all().

During an async request no other sync and async calls are allowed, and will result in Gio::Error with PENDING being thrown.

A value of count larger than MAXSSIZE will cause a Gio::Error with INVALID_ARGUMENT to be thrown.

On success, the number of bytes written will be passed to the callback slot. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, but generally we try to write as many bytes as requested.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is Glib::PRIORITY_DEFAULT.

The asyncronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

For the synchronous, blocking version of this function, see write().

Note that no copy of buffer will be made, so it must stay valid until slot is called.

Parameters

buffer	The buffer containing the data to write.
count	The number of bytes to write
slot	Callback slot to call when the request is satisfied.
io_priority	The io priority of the request.

write_all_finish()

bool Gio::OutputStream::write_all_finish	(	const Glib::RefPtr< AsyncResult > &	result,
		gsize &	bytes_written
	)

Finishes an asynchronous stream write operation started with g_output_stream_write_all_async().

As a special exception to the normal conventions for functions that use Error, if this function returns false (and sets error) then bytes_written will be set to the number of bytes that were successfully written before the error was encountered. This functionality is only available from C. If you need it from another language then you must write your own loop around g_output_stream_write_async().

Since glibmm 2.44:

Parameters

result	A AsyncResult.
bytes_written	Location to store the number of bytes that was written to the stream.

Returns

true on success, false if there was an error.

Exceptions

Glib::Error

write_async() [1/2]

void Gio::OutputStream::write_async	(	const void *	buffer,
		gsize	count,
		const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Request an asynchronous write of count bytes from buffer into the stream.

When the operation is finished slot will be called. You can then call write_finish() to get the result of the operation.

During an async request no other sync and async calls are allowed, and will result in Gio::Error with PENDING being thrown.

A value of count larger than MAXSSIZE will cause a Gio::Error with INVALID_ARGUMENT to be thrown.

On success, the number of bytes written will be passed to the callback slot. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, but generally we try to write as many bytes as requested.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is Glib::PRIORITY_DEFAULT.

The asyncronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

For the synchronous, blocking version of this function, see write().

Note that no copy of buffer will be made, so it must stay valid until slot is called. See write_bytes_async() for a Glib::Bytes version that will automatically hold a reference to the contents (without copying) for the duration of the call.

Parameters

buffer	The buffer containing the data to write.
count	The number of bytes to write
slot	Callback slot to call when the request is satisfied.
cancellable	Cancellable object.
io_priority	The io priority of the request.

write_async() [2/2]

void Gio::OutputStream::write_async	(	const void *	buffer,
		gsize	count,
		const SlotAsyncReady &	slot,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Request an asynchronous write of count bytes from buffer into the stream.

When the operation is finished slot will be called. You can then call write_finish() to get the result of the operation.

During an async request no other sync and async calls are allowed, and will result in Gio::Error with PENDING being thrown.

A value of count larger than MAXSSIZE will cause a Gio::Error with INVALID_ARGUMENT to be thrown.

On success, the number of bytes written will be passed to the callback slot. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, but generally we try to write as many bytes as requested.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is Glib::PRIORITY_DEFAULT.

The asyncronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

For the synchronous, blocking version of this function, see write().

Note that no copy of buffer will be made, so it must stay valid until slot is called. See write_bytes_async() for a Glib::Bytes version that will automatically hold a reference to the contents (without copying) for the duration of the call.

Parameters

buffer	The buffer containing the data to write.
count	The number of bytes to write
slot	Callback slot to call when the request is satisfied.
io_priority	The io priority of the request.

write_bytes() [1/2]

gssize Gio::OutputStream::write_bytes

(

const Glib::RefPtr< const Glib::Bytes > &

bytes

)

A write_bytes() convenience overload.

write_bytes() [2/2]

gssize Gio::OutputStream::write_bytes	(	const Glib::RefPtr< const Glib::Bytes > &	bytes,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

A wrapper function for g_output_stream_write() which takes a Bytes as input.

This can be more convenient for use by language bindings or in other cases where the refcounted nature of Bytes is helpful over a bare pointer interface.

However, note that this function may still perform partial writes, just like g_output_stream_write(). If that occurs, to continue writing, you will need to create a new Bytes containing just the remaining bytes, using Glib::bytes_new_from_bytes(). Passing the same Bytes instance multiple times potentially can result in duplicated data in the output stream.

Parameters

bytes	The Bytes to write.
cancellable	Optional cancellable object.

Returns

Number of bytes written, or -1 on error.

Exceptions

Glib::Error

write_bytes_async() [1/2]

void Gio::OutputStream::write_bytes_async	(	const Glib::RefPtr< const Glib::Bytes > &	bytes,
		const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Request an asynchronous write of the data in bytes to the stream.

When the operation is finished slot will be called. You can then call write_bytes_finish() to get the result of the operation.

During an async request no other sync and async calls are allowed, and will result in Gio::Error with PENDING being thrown.

A Glib:Bytes larger than MAXSSIZE will cause a Gio::Error with INVALID_ARGUMENT to be thrown.

On success, the number of bytes written will be passed to the callback slot. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, but generally we try to write as many bytes as requested.

You are guaranteed that this method will never fail with IO_ERROR_WOULD_BLOCK - if the stream can't accept more data, the method will just wait until this changes.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is Glib::PRIORITY_DEFAULT.

For the synchronous, blocking version of this function, see write_bytes().

Parameters

bytes	The bytes to
slot	Callback slot to call when the request is satisfied.
cancellable	Cancellable object.
io_priority	The io priority of the request.

Since glibmm 2.34:

write_bytes_async() [2/2]

void Gio::OutputStream::write_bytes_async	(	const Glib::RefPtr< const Glib::Bytes > &	bytes,
		const SlotAsyncReady &	slot,
		int	io_priority = Glib::PRIORITY_DEFAULT
	)

Request an asynchronous write of the data in bytes to the stream.

When the operation is finished slot will be called. You can then call write_bytes_finish() to get the result of the operation.

During an async request no other sync and async calls are allowed, and will result in Gio::Error with PENDING being thrown.

A Glib:Bytes larger than MAXSSIZE will cause a Gio::Error with INVALID_ARGUMENT to be thrown.

On success, the number of bytes written will be passed to the callback slot. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, but generally we try to write as many bytes as requested.

You are guaranteed that this method will never fail with IO_ERROR_WOULD_BLOCK - if the stream can't accept more data, the method will just wait until this changes.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is Glib::PRIORITY_DEFAULT.

For the synchronous, blocking version of this function, see write_bytes().

Parameters

bytes	The bytes to
slot	Callback slot to call when the request is satisfied.
io_priority	The io priority of the request.

Since glibmm 2.34:

write_bytes_finish()

gssize Gio::OutputStream::write_bytes_finish

(

const Glib::RefPtr< AsyncResult > &

result

)

Finishes a stream write-from-Bytes operation.

Parameters

result

A AsyncResult.

Returns

A gssize containing the number of bytes written to the stream.

Exceptions

Glib::Error

write_finish()

gssize Gio::OutputStream::write_finish

(

const Glib::RefPtr< AsyncResult > &

result

)

Finishes a stream write operation.

Parameters

result

A AsyncResult.

Returns

A gssize containing the number of bytes written to the stream.

Exceptions

Glib::Error

write_vfunc()

virtual gssize Gio::OutputStream::write_vfunc ( const void *  buffer, gsize  count, const Glib::RefPtr< Cancellable > &  cancellable  )

protectedvirtual

Exceptions

Glib::Error.

Friends And Related Symbol Documentation

wrap()

Glib::RefPtr< Gio::OutputStream > wrap ( GOutputStream *  object, bool  take_copy = false  )

related

A Glib::wrap() method for this object.

Parameters

object	The C instance.
take_copy	False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns

A C++ instance that wraps this C instance.