Gio::Seekable Class Reference

Stream seeking interface. More...

#include <giomm/seekable.h>

Inheritance diagram for Gio::Seekable:

Public Member Functions
	Seekable (Seekable &&src) noexcept
Seekable &	operator= (Seekable &&src) noexcept
	~Seekable () noexcept override
GSeekable *	gobj ()
	Provides access to the underlying C GObject.
const GSeekable *	gobj () const
	Provides access to the underlying C GObject.
goffset	tell () const
	Tells the current position within the stream.
bool	can_seek () const
	Tests if the stream supports the SeekableIface.
bool	seek (goffset offset, Glib::SeekType type, const Glib::RefPtr< Cancellable > &cancellable)
	Seeks in the stream by the given offset, modified by type.
bool	seek (goffset offset, Glib::SeekType type)
	A seek() convenience overload.
bool	can_truncate () const
	Tests if the length of the stream can be adjusted with g_seekable_truncate().
bool	truncate (goffset offset, const Glib::RefPtr< Cancellable > &cancellable)
	Truncates a stream with a given offset.
bool	truncate (goffset offset)
	A truncate() convenience overload.
Public Member Functions inherited from Glib::Interface
	Interface ()
	A Default constructor.
	Interface (Interface &&src) noexcept
Interface &	operator= (Interface &&src) noexcept
	Interface (const Glib::Interface_Class &interface_class)
	Called by constructors of derived classes.
	Interface (GObject *castitem)
	Called by constructors of derived classes.
	~Interface () noexcept override
	Interface (const Interface &)=delete
Interface &	operator= (const Interface &)=delete
GObject *	gobj ()
const GObject *	gobj () const
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 void	add_interface (GType gtype_implementer)
static GType	get_type ()
	Get the GType for this class, for use with the underlying GObject type system.

Protected Member Functions
	Seekable ()
	You should derive from this class to use it.
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::Seekable >	wrap (GSeekable *object, bool take_copy=false)
	A Glib::wrap() method for this object.

Detailed Description

Stream seeking interface.

Seekable is implemented by streams (implementations of InputStream or OutputStream) that support seeking. To find the position of a stream, use tell(). To find out if a stream supports seeking, use can_seek(). To position a stream, use seek(). To find out if a stream supports truncating, use can_truncate(). To truncate a stream, use truncate().

Since glibmm 2.16:

Constructor & Destructor Documentation

Seekable() [1/2]

Gio::Seekable::Seekable ( )

protected

You should derive from this class to use it.

Seekable() [2/2]

Gio::Seekable::Seekable ( Seekable &&  src )

noexcept

~Seekable()

Gio::Seekable::~Seekable ( )

overridenoexcept

Member Function Documentation

add_interface()

static void Gio::Seekable::add_interface ( GType  gtype_implementer )

static

can_seek()

bool Gio::Seekable::can_seek

(

)

const

Tests if the stream supports the SeekableIface.

Returns

true if seekable can be seeked. false otherwise.

can_truncate()

bool Gio::Seekable::can_truncate

(

)

const

Tests if the length of the stream can be adjusted with g_seekable_truncate().

Returns

true if the stream can be truncated, false otherwise.

get_type()

static GType Gio::Seekable::get_type ( )

static

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

gobj() [1/2]

GSeekable * Gio::Seekable::gobj ( )

inline

Provides access to the underlying C GObject.

gobj() [2/2]

const GSeekable * Gio::Seekable::gobj ( ) const

inline

Provides access to the underlying C GObject.

operator=()

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

noexcept

seek() [1/2]

bool Gio::Seekable::seek	(	goffset	offset,
		Glib::SeekType	type
	)

A seek() convenience overload.

seek() [2/2]

bool Gio::Seekable::seek	(	goffset	offset,
		Glib::SeekType	type,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Seeks in the stream by the given offset, modified by type.

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

offset	A goffset.
type	A SeekType.
cancellable	Cancellable object.

Returns

true if successful. If an error has occurred, this function will return false and set error appropriately if present.

Exceptions

Glib::Error

tell()

goffset Gio::Seekable::tell

(

)

const

Tells the current position within the stream.

Returns

The (positive or zero) offset from the beginning of the buffer, zero if the target is not seekable.

truncate() [1/2]

bool Gio::Seekable::truncate

(

goffset

offset

)

A truncate() convenience overload.

truncate() [2/2]

bool Gio::Seekable::truncate	(	goffset	offset,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Truncates a stream with a given offset.

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

offset	A goffset.
cancellable	Cancellable object.

Returns

true if successful. If an error has occurred, this function will return false and set error appropriately if present.

Exceptions

Glib::Error

Friends And Related Symbol Documentation

wrap()

Glib::RefPtr< Gio::Seekable > wrap ( GSeekable *  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.