Gio::MemoryOutputStream Class Reference
Stream Classes

Streaming output operations on memory chunks. More...

`#include <giomm/memoryoutputstream.h>`

Inheritance diagram for Gio::MemoryOutputStream:
[legend]

## Public Member Functions

| MemoryOutputStream (MemoryOutputStream&& src) noexcept
MemoryOutputStream& | operator= (MemoryOutputStream&& src) noexcept
| ~MemoryOutputStream () noexcept override
GMemoryOutputStream* | gobj ()
| Provides access to the underlying C GObject. More...
const GMemoryOutputStream* | gobj () const
| Provides access to the underlying C GObject. More...
GMemoryOutputStream* | gobj_copy ()
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More...
void* | get_data ()
| Gets any loaded data from the ostream. More...
const void* | get_data () const
| Gets any loaded data from the ostream. More...
void* | steal_data ()
| Gets any loaded data from the ostream. More...
gsize | get_size () const
| Gets the size of the currently allocated data area (available from g_memory_output_stream_get_data()). More...
gsize | get_data_size () const
| Returns the number of bytes from the start up to including the last byte written in the stream that has not been truncated away. More...
Glib::RefPtr< Glib::Bytes > | steal_as_bytes ()
| Returns data from the ostream as a Bytes. More...
Glib::PropertyProxy_ReadOnly< void*> | property_data () const
| Pointer to buffer where data will be written. More...
Glib::PropertyProxy_ReadOnly< gulong > | property_data_size () const
| Size of data written to the buffer. More...
Glib::PropertyProxy_ReadOnly< gulong > | property_size () const
| Current size of the data buffer. More...
Public Member Functions inherited from Gio::OutputStream
| OutputStream (OutputStream&& src) noexcept
OutputStream& | operator= (OutputStream&& src) noexcept
| ~OutputStream () noexcept override
GOutputStream* | gobj ()
| Provides access to the underlying C GObject. More...
const GOutputStream* | gobj () const
| Provides access to the underlying C GObject. More...
GOutputStream* | gobj_copy ()
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More...
gssize | write (const void* buffer, gsize count, const Glib::RefPtr< Cancellable >& cancellable)
| Tries to write count bytes from buffer into the stream. More...
gssize | write (const void* buffer, gsize count)
| A write() convenience overload. More...
gssize | write (const std::string& buffer, const Glib::RefPtr< Cancellable >& cancellable)
| Tries to write count bytes from buffer into the stream. More...
gssize | write (const std::string& buffer)
| Tries to write count bytes from buffer into the stream. More...
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. More...
bool | write_all (const void* buffer, gsize count, gsize& bytes_written)
| A write_all() convenience overload. More...
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. More...
bool | write_all (const std::string& buffer, gsize& bytes_written)
| Tries to write count bytes from buffer into the stream. More...
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. More...
gssize | write_bytes (const Glib::RefPtr< const Glib::Bytes >& bytes)
| A write_bytes() convenience overload. More...
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. More...
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. More...
gssize | write_bytes_finish (const Glib::RefPtr< AsyncResult >& result)
| Finishes a stream write-from-Bytes operation. More...
gssize | splice (const Glib::RefPtr< InputStream >& source, const Glib::RefPtr< Cancellable >& cancellable, OutputStreamSpliceFlags flags=OUTPUT_STREAM_SPLICE_NONE)
| Splices an input stream into an output stream. More...
gssize | splice (const Glib::RefPtr< InputStream >& source, OutputStreamSpliceFlags flags=OUTPUT_STREAM_SPLICE_NONE)
| Splices an input stream into an output stream. More...
bool | flush (const Glib::RefPtr< Cancellable >& cancellable)
| Flushed any outstanding buffers in the stream. More...
bool | flush ()
| A flush() convenience overload. More...
bool | close (const Glib::RefPtr< Cancellable >& cancellable)
| Closes the stream, releasing resources related to it. More...
bool | close ()
| A close() convenience overload. More...
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. More...
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. More...
gssize | write_finish (const Glib::RefPtr< AsyncResult >& result)
| Finishes a stream write operation. More...
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. More...
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. More...
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(). More...
void | splice_async (const Glib::RefPtr< InputStream >& source, const SlotAsyncReady& slot, const Glib::RefPtr< Cancellable >& cancellable, OutputStreamSpliceFlags flags=OUTPUT_STREAM_SPLICE_NONE, int io_priority=Glib::PRIORITY_DEFAULT)
| Splices a stream asynchronously. More...
void | splice_async (const Glib::RefPtr< InputStream >& source, const SlotAsyncReady& slot, OutputStreamSpliceFlags flags=OUTPUT_STREAM_SPLICE_NONE, int io_priority=Glib::PRIORITY_DEFAULT)
| Splices a stream asynchronously. More...
gssize | splice_finish (const Glib::RefPtr< AsyncResult >& result)
| Finishes an asynchronous stream splice operation. More...
void | flush_async (const SlotAsyncReady& slot, const Glib::RefPtr< Cancellable >& cancellable, int io_priority=Glib::PRIORITY_DEFAULT)
| Flushes a stream asynchronously. More...
void | flush_async (const SlotAsyncReady& slot, int io_priority=Glib::PRIORITY_DEFAULT)
| Flushes a stream asynchronously. More...
bool | flush_finish (const Glib::RefPtr< AsyncResult >& result)
| Finishes flushing an output stream. More...
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. More...
void | close_async (const SlotAsyncReady& slot, int io_priority=Glib::PRIORITY_DEFAULT)
| Requests an asynchronous close of the stream, releasing resources related to it. More...
bool | close_finish (const Glib::RefPtr< AsyncResult >& result)
| Closes an output stream. More...
bool | is_closed () const
| Checks if an output stream has already been closed. More...
bool | is_closing () const
| Checks if an output stream is being closed. More...
bool | has_pending () const
| Checks if an output stream has pending actions. More...
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 (const Quark& key, void* data, DestroyNotify notify)
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. More...
void | get_property_value (const Glib::ustring& property_name, Glib::ValueBase& value) const
| You probably want to use a specific property_*() accessor method instead. More...
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. More...
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. More...
void | 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. More...
void | connect_property_changed (const Glib::ustring& property_name, sigc::slot< void >&& slot)
| You can use the signal_changed() signal of the property proxy instead. More...
sigc::connection | connect_property_changed_with_return (const Glib::ustring& property_name, const sigc::slot< void >& slot)
| You can use the signal_changed() signal of the property proxy instead. More...
sigc::connection | connect_property_changed_with_return (const Glib::ustring& property_name, sigc::slot< void >&& slot)
| You can use the signal_changed() signal of the property proxy instead. More...
void | freeze_notify ()
| Increases the freeze count on object. More...
void | thaw_notify ()
| Reverts the effect of a previous call to freeze_notify(). More...
virtual void | reference () const
| Increment the reference count for this object. More...
virtual void | unreference () const
| Decrement the reference count for this object. More...
GObject* | gobj ()
| Provides access to the underlying C GObject. More...
const GObject* | gobj () const
| Provides access to the underlying C GObject. More...
GObject* | gobj_copy () const
| Give a ref-ed copy to someone. Use for direct struct access. More...
Public Member Functions inherited from sigc::trackable
| trackable () noexcept
| trackable (const trackable &src) noexcept
| trackable (trackable &&src)
| ~trackable ()
void | add_destroy_notify_callback (void *data, func_destroy_notify func) const
void | notify_callbacks ()
trackable & | operator= (const trackable &src)
trackable & | operator= (trackable &&src)
void | remove_destroy_notify_callback (void *data) const
Public Member Functions inherited from Gio::Seekable
| Seekable (Seekable&& src) noexcept
Seekable& | operator= (Seekable&& src) noexcept
| ~Seekable () noexcept override
GSeekable* | gobj ()
| Provides access to the underlying C GObject. More...
const GSeekable* | gobj () const
| Provides access to the underlying C GObject. More...
goffset | tell () const
| Tells the current position within the stream. More...
bool | can_seek () const
| Tests if the stream supports the SeekableIface. More...
bool | seek (goffset offset, Glib::SeekType type, const Glib::RefPtr< Cancellable >& cancellable)
| Seeks in the stream by the given offset, modified by type. More...
bool | seek (goffset offset, Glib::SeekType type)
| A seek() convenience overload. More...
bool | can_truncate () const
| Tests if the length of the stream can be adjusted with g_seekable_truncate(). More...
bool | truncate (goffset offset, const Glib::RefPtr< Cancellable >& cancellable)
| Truncates a stream with a given #offset. More...
bool | truncate (goffset offset)
| A truncate() convenience overload. More...
Public Member Functions inherited from Glib::Interface
| Interface ()
| A Default constructor. More...
| Interface (Interface&& src) noexcept
Interface& | operator= (Interface&& src) noexcept
| Interface (const Glib::Interface_Class& interface_class)
| Called by constructors of derived classes. More...
| Interface (GObject* castitem)
| Called by constructors of derived classes. More...
| ~Interface () noexcept override
| Interface (const Interface&)=delete
Interface& | operator= (const Interface&)=delete
GObject* | gobj ()
const GObject* | gobj () const

## Static Public Member Functions

static GType | get_type ()
| Get the GType for this class, for use with the underlying GObject type system. More...
static Glib::RefPtr< MemoryOutputStream > | create ()
static Glib::RefPtr< MemoryOutputStream > | create (void* data, gsize size, GReallocFunc realloc_function, GDestroyNotify destroy_function)
Static Public Member Functions inherited from Gio::OutputStream
static GType | get_type ()
| Get the GType for this class, for use with the underlying GObject type system. More...
Static Public Member Functions inherited from Gio::Seekable
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. More...

## Protected Member Functions

| MemoryOutputStream ()
| Creates a resizable stream. More...
| MemoryOutputStream (void* data, gsize size, GReallocFunc realloc_function, GDestroyNotify destroy_function)
Protected Member Functions inherited from Gio::OutputStream
| OutputStream ()
bool | set_pending ()
| Sets stream to have actions pending. More...
void | clear_pending ()
| Clears the pending flag on stream. More...
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. More...
| ObjectBase (const char* custom_type_name)
| A derived constructor always overrides this choice. More...
| 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. More...
| 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)
Protected Member Functions inherited from Gio::Seekable
| Seekable ()
| You should derive from this class to use it. More...

## Related Functions

(Note that these are not member functions.)
Glib::RefPtr< Gio::MemoryOutputStream > | wrap (GMemoryOutputStream* object, bool take_copy=false)
| A Glib::wrap() method for this object. More...
Related Functions inherited from Gio::OutputStream
Glib::RefPtr< Gio::OutputStream > | wrap (GOutputStream* object, bool take_copy=false)
| A Glib::wrap() method for this object. More...
Related Functions inherited from Glib::Object
Glib::RefPtr< Glib::Object > | wrap (GObject* object, bool take_copy=false)
Related Functions inherited from Gio::Seekable
Glib::RefPtr< Gio::Seekable > | wrap (GSeekable* object, bool take_copy=false)
| A Glib::wrap() method for this object. More...

## Additional Inherited Members

Public Types inherited from Glib::Object
using | DestroyNotify = void(*)(gpointer data)
Public Types inherited from sigc::trackable
typedef internal::func_destroy_notify | func_destroy_notify

## Detailed Description

Streaming output operations on memory chunks.

This class uses arbitrary memory chunks as output for GIO streaming output operations.

Since glibmm 2.20:

## Constructor & Destructor Documentation

## MemoryOutputStream() [1/3]

Gio::MemoryOutputStream::MemoryOutputStream | ( | MemoryOutputStream&& | src | ) |

noexcept

## ~MemoryOutputStream()

Gio::MemoryOutputStream::~MemoryOutputStream | ( |  | ) |

override noexcept

## MemoryOutputStream() [2/3]

Gio::MemoryOutputStream::MemoryOutputStream | ( |  | ) |

protected

Creates a resizable stream.

## MemoryOutputStream() [3/3]

Gio::MemoryOutputStream::MemoryOutputStream | ( | void * | data,
|  | gsize | size,
|  | GReallocFunc | realloc_function,
|  | GDestroyNotify | destroy_function
| ) |  |

explicit protected

## Member Function Documentation

## create() [1/2]

static Glib::RefPtr<MemoryOutputStream> Gio::MemoryOutputStream::create | ( |  | ) |

static

## create() [2/2]

static Glib::RefPtr<MemoryOutputStream> Gio::MemoryOutputStream::create | ( | void * | data,
|  | gsize | size,
|  | GReallocFunc | realloc_function,
|  | GDestroyNotify | destroy_function
| ) |  |

static

## get_data() [1/2]

void* Gio::MemoryOutputStream::get_data | ( |  | ) |

Gets any loaded data from the ostream.

Note that the returned pointer may become invalid on the next write or truncate operation on the stream.

Returns
  Pointer to the stream's data, or `nullptr` if the data has been stolen.

## get_data() [2/2]

const void* Gio::MemoryOutputStream::get_data | ( |  | ) | const

Gets any loaded data from the ostream.

Note that the returned pointer may become invalid on the next write or truncate operation on the stream.

Returns
  Pointer to the stream's data, or `nullptr` if the data has been stolen.

## get_data_size()

gsize Gio::MemoryOutputStream::get_data_size | ( |  | ) | const

Returns the number of bytes from the start up to including the last byte written in the stream that has not been truncated away.

Since glibmm 2.18:

Returns
  The number of bytes written to the stream.

## get_size()

gsize Gio::MemoryOutputStream::get_size | ( |  | ) | const

Gets the size of the currently allocated data area (available from g_memory_output_stream_get_data()).

You probably don't want to use this function on resizable streams. See g_memory_output_stream_get_data_size() instead. For resizable streams the size returned by this function is an implementation detail and may be change at any time in response to operations on the stream.

If the stream is fixed-sized (ie: no realloc was passed to g_memory_output_stream_new()) then this is the maximum size of the stream and further writes will return IO_ERROR_NO_SPACE.

In any case, if you want the number of bytes currently written to the stream, use g_memory_output_stream_get_data_size().

Returns
  The number of bytes allocated for the data buffer.

## get_type()

static GType Gio::MemoryOutputStream::get_type | ( |  | ) |

static

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

## gobj() [1/2]

GMemoryOutputStream* Gio::MemoryOutputStream::gobj | ( |  | ) |

inline

Provides access to the underlying C GObject.

## gobj() [2/2]

const GMemoryOutputStream* Gio::MemoryOutputStream::gobj | ( |  | ) | const

inline

Provides access to the underlying C GObject.

## gobj_copy()

GMemoryOutputStream* Gio::MemoryOutputStream::gobj_copy | ( |  | ) |

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

## operator=()

MemoryOutputStream& Gio::MemoryOutputStream::operator= | ( | MemoryOutputStream&& | src | ) |

noexcept

## property_data()

Glib::PropertyProxy_ReadOnly< void* > Gio::MemoryOutputStream::property_data | ( |  | ) | const

Pointer to buffer where data will be written.

Since glibmm 2.24:

Returns
  A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

## property_data_size()

Glib::PropertyProxy_ReadOnly< gulong > Gio::MemoryOutputStream::property_data_size | ( |  | ) | const

Size of data written to the buffer.

Since glibmm 2.24:

Default value: 0

Returns
  A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

## property_size()

Glib::PropertyProxy_ReadOnly< gulong > Gio::MemoryOutputStream::property_size | ( |  | ) | const

Current size of the data buffer.

Since glibmm 2.24:

Default value: 0

Returns
  A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

## steal_as_bytes()

Glib::RefPtr<Glib::Bytes> Gio::MemoryOutputStream::steal_as_bytes | ( |  | ) |

Returns data from the ostream as a Bytes.

ostream must be closed before calling this function.

Since glibmm 2.34:

Returns
  The stream's data.

## steal_data()

void* Gio::MemoryOutputStream::steal_data | ( |  | ) |

Gets any loaded data from the ostream.

Ownership of the data is transferred to the caller; when no longer needed it must be freed using the free function set in ostream's MemoryOutputStream::property_destroy_function() property.

ostream must be closed before calling this function.

Since glibmm 2.26:

Returns
  The stream's data, or `nullptr` if it has previously been stolen.

## Friends And Related Function Documentation

## wrap()

Glib::RefPtr< Gio::MemoryOutputStream > wrap | ( | GMemoryOutputStream * | 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.