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<title>GMemoryOutputStream: GIO Reference Manual</title>
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<link rel="prev" href="GMemoryInputStream.html" title="GMemoryInputStream">
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Top |
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Description |
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Object Hierarchy |
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Implemented Interfaces |
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Properties
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GMemoryOutputStream
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GMemoryOutputStream — Streaming output operations on memory chunks
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Functions
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gpointer
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(*GReallocFunc) ()
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GOutputStream *
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g_memory_output_stream_new ()
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GOutputStream *
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g_memory_output_stream_new_resizable ()
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gpointer
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g_memory_output_stream_get_data ()
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gsize
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g_memory_output_stream_get_size ()
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gsize
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g_memory_output_stream_get_data_size ()
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gpointer
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g_memory_output_stream_steal_data ()
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GBytes *
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g_memory_output_stream_steal_as_bytes ()
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Properties
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gpointer
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data
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Read / Write / Construct Only
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gulong
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data-size
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Read
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gpointer
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destroy-function
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Read / Write / Construct Only
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gpointer
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realloc-function
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Read / Write / Construct Only
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gulong
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size
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Read / Write / Construct Only
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Types and Values
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GMemoryOutputStream
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Object Hierarchy
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GObject
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╰── GOutputStream
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╰── GMemoryOutputStream
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Implemented Interfaces
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GMemoryOutputStream implements
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GSeekable and GPollableOutputStream.
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Includes
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#include <gio/gio.h>
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Description
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GMemoryOutputStream is a class for using arbitrary
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memory chunks as output for GIO streaming output operations.
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As of GLib 2.34, GMemoryOutputStream trivially implements
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GPollableOutputStream: it always polls as ready.
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Functions
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GReallocFunc ()
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gpointer
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(*GReallocFunc) (gpointer data,
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gsize size);
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Changes the size of the memory block pointed to by data
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to
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size
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bytes.
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The function should have the same semantics as realloc().
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Parameters
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data
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memory block to reallocate
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size
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size to reallocate data
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to
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Returns
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a pointer to the reallocated memory
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g_memory_output_stream_new ()
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GOutputStream *
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g_memory_output_stream_new (gpointer data,
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gsize size,
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GReallocFunc realloc_function,
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GDestroyNotify destroy_function);
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Creates a new GMemoryOutputStream.
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In most cases this is not the function you want. See
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g_memory_output_stream_new_resizable() instead.
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If data
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is non-NULL, the stream will use that for its internal storage.
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If realloc_fn
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is non-NULL, it will be used for resizing the internal
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storage when necessary and the stream will be considered resizable.
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In that case, the stream will start out being (conceptually) empty.
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size
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is used only as a hint for how big data
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is. Specifically,
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seeking to the end of a newly-created stream will seek to zero, not
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size
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introduce a zero-filled gap.
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If realloc_fn
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is NULL then the stream is fixed-sized. Seeking to
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the end will seek to size
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exactly. Writing past the end will give
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an 'out of space' error. Attempting to seek past the end will fail.
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Unlike the resizable case, seeking to an offset within the stream and
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writing will preserve the bytes passed in as data
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before that point
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and will return them as part of g_memory_output_stream_steal_data().
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If you intend to seek you should probably therefore ensure that data
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is properly initialised.
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It is probably only meaningful to provide data
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and size
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in the case
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that you want a fixed-sized stream. Put another way: if realloc_fn
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is non-NULL then it makes most sense to give data
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as NULL and
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size
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as 0 (allowing GMemoryOutputStream to do the initial
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allocation for itself).
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1
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stream = g_memory_output_stream_new (NULL, 0, realloc, free);
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stream2 = g_memory_output_stream_new (NULL, 0, g_realloc, g_free);
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data = malloc (200);
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stream3 = g_memory_output_stream_new (data, 200, NULL, free);
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[skip]
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Parameters
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data
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pointer to a chunk of memory to use, or NULL.
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[nullable]
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size
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the size of data
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realloc_function
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a function with realloc() semantics (like g_realloc())
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to be called when data
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needs to be grown, or NULL.
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[nullable]
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destroy_function
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a function to be called on data
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when the stream is
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finalized, or NULL.
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[nullable]
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Returns
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A newly created GMemoryOutputStream object.
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g_memory_output_stream_new_resizable ()
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GOutputStream *
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g_memory_output_stream_new_resizable (void);
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Creates a new GMemoryOutputStream, using g_realloc() and g_free()
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for memory allocation.
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Since: 2.36
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g_memory_output_stream_get_data ()
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gpointer
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g_memory_output_stream_get_data (GMemoryOutputStream *ostream);
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Gets any loaded data from the ostream
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.
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Note that the returned pointer may become invalid on the next
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write or truncate operation on the stream.
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Parameters
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ostream
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a GMemoryOutputStream
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Returns
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pointer to the stream's data, or NULL if the data
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has been stolen.
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[transfer none]
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g_memory_output_stream_get_size ()
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gsize
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g_memory_output_stream_get_size (GMemoryOutputStream *ostream);
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Gets the size of the currently allocated data area (available from
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g_memory_output_stream_get_data()).
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You probably don't want to use this function on resizable streams.
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See g_memory_output_stream_get_data_size() instead. For resizable
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streams the size returned by this function is an implementation
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detail and may be change at any time in response to operations on the
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stream.
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If the stream is fixed-sized (ie: no realloc was passed to
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g_memory_output_stream_new()) then this is the maximum size of the
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stream and further writes will return G_IO_ERROR_NO_SPACE.
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In any case, if you want the number of bytes currently written to the
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stream, use g_memory_output_stream_get_data_size().
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Parameters
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ae235b |
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ae235b |
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ae235b |
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ae235b |
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ostream
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ae235b |
a GMemoryOutputStream
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ae235b |
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ae235b |
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ae235b |
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Returns
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the number of bytes allocated for the data buffer
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g_memory_output_stream_get_data_size ()
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gsize
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g_memory_output_stream_get_data_size (GMemoryOutputStream *ostream);
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Returns the number of bytes from the start up to including the last
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byte written in the stream that has not been truncated away.
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Parameters
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Packit |
ae235b |
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Packit |
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ae235b |
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ae235b |
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ae235b |
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ae235b |
ostream
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Packit |
ae235b |
a GMemoryOutputStream
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Packit |
ae235b |
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ae235b |
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Returns
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the number of bytes written to the stream
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Since: 2.18
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g_memory_output_stream_steal_data ()
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gpointer
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g_memory_output_stream_steal_data (GMemoryOutputStream *ostream);
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Gets any loaded data from the ostream
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. Ownership of the data
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is transferred to the caller; when no longer needed it must be
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freed using the free function set in ostream
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's
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“destroy-function” property.
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ostream
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must be closed before calling this function.
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ae235b |
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Parameters
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ae235b |
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ae235b |
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ae235b |
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ae235b |
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Packit |
ae235b |
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ae235b |
ostream
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Packit |
ae235b |
a GMemoryOutputStream
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Packit |
ae235b |
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ae235b |
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ae235b |
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ae235b |
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ae235b |
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Returns
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the stream's data, or NULL if it has previously
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been stolen.
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[transfer full]
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Packit |
ae235b |
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ae235b |
Since: 2.26
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ae235b |
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ae235b |
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ae235b |
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ae235b |
g_memory_output_stream_steal_as_bytes ()
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ae235b |
GBytes *
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ae235b |
g_memory_output_stream_steal_as_bytes (GMemoryOutputStream *ostream);
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ae235b |
Returns data from the ostream
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Packit |
ae235b |
as a GBytes. ostream
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ae235b |
must be
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closed before calling this function.
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ae235b |
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ae235b |
Parameters
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Packit |
ae235b |
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Packit |
ae235b |
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Packit |
ae235b |
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ae235b |
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Packit |
ae235b |
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Packit |
ae235b |
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Packit |
ae235b |
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Packit |
ae235b |
ostream
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Packit |
ae235b |
a GMemoryOutputStream
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Packit |
ae235b |
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Packit |
ae235b |
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Packit |
ae235b |
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Packit |
ae235b |
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ae235b |
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Packit |
ae235b |
Returns
|
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Packit |
ae235b |
the stream's data.
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Packit |
ae235b |
[transfer full]
|
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Packit |
ae235b |
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Packit |
ae235b |
Since: 2.34
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ae235b |
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ae235b |
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ae235b |
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ae235b |
Types and Values
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ae235b |
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Packit |
ae235b |
GMemoryOutputStream
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|
Packit |
ae235b |
typedef struct _GMemoryOutputStream GMemoryOutputStream;
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ae235b |
Implements GOutputStream for arbitrary memory chunks.
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ae235b |
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ae235b |
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ae235b |
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ae235b |
Property Details
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Packit |
ae235b |
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Packit |
ae235b |
The “data” property
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|
Packit |
ae235b |
“data” gpointer
|
|
Packit |
ae235b |
Pointer to buffer where data will be written.
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Packit |
ae235b |
Flags: Read / Write / Construct Only
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Packit |
ae235b |
Since: 2.24
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Packit |
ae235b |
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Packit |
ae235b |
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Packit |
ae235b |
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ae235b |
The “data-size” property
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|
Packit |
ae235b |
“data-size” gulong
|
|
Packit |
ae235b |
Size of data written to the buffer.
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Packit |
ae235b |
Flags: Read
|
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Packit |
ae235b |
Since: 2.24
|
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Packit |
ae235b |
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Packit |
ae235b |
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Packit |
ae235b |
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Packit |
ae235b |
The “destroy-function” property
|
|
Packit |
ae235b |
“destroy-function” gpointer
|
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Packit |
ae235b |
Function called with the buffer as argument when the stream is destroyed.
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Packit |
ae235b |
[skip]
|
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Packit |
ae235b |
Flags: Read / Write / Construct Only
|
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Packit |
ae235b |
Since: 2.24
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Packit |
ae235b |
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Packit |
ae235b |
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ae235b |
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ae235b |
The “realloc-function” property
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ae235b |
“realloc-function” gpointer
|
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Packit |
ae235b |
Function with realloc semantics called to enlarge the buffer.
|
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Packit |
ae235b |
[skip]
|
|
Packit |
ae235b |
Flags: Read / Write / Construct Only
|
|
Packit |
ae235b |
Since: 2.24
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Packit |
ae235b |
|
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Packit |
ae235b |
|
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Packit |
ae235b |
|
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Packit |
ae235b |
The “size” property
|
|
Packit |
ae235b |
“size” gulong
|
|
Packit |
ae235b |
Current size of the data buffer.
|
|
Packit |
ae235b |
Flags: Read / Write / Construct Only
|
|
Packit |
ae235b |
Since: 2.24
|
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Packit |
ae235b |
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Packit |
ae235b |
|
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ae235b |
|
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ae235b |
See Also
|
|
Packit |
ae235b |
GMemoryInputStream
|
|
Packit |
ae235b |
|
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ae235b |
|
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ae235b |
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Generated by GTK-Doc V1.27
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</body>
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</html>
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