GInputStream

GInputStream — Base class for implementing streaming input

Synopsis

#include <gio/gio.h>

                    GInputStream;
gssize              g_input_stream_read                 (GInputStream *stream,
                                                         void *buffer,
                                                         gsize count,
                                                         GCancellable *cancellable,
                                                         GError **error);
gboolean            g_input_stream_read_all             (GInputStream *stream,
                                                         void *buffer,
                                                         gsize count,
                                                         gsize *bytes_read,
                                                         GCancellable *cancellable,
                                                         GError **error);
gssize              g_input_stream_skip                 (GInputStream *stream,
                                                         gsize count,
                                                         GCancellable *cancellable,
                                                         GError **error);
gboolean            g_input_stream_close                (GInputStream *stream,
                                                         GCancellable *cancellable,
                                                         GError **error);
void                g_input_stream_read_async           (GInputStream *stream,
                                                         void *buffer,
                                                         gsize count,
                                                         int io_priority,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);
gssize              g_input_stream_read_finish          (GInputStream *stream,
                                                         GAsyncResult *result,
                                                         GError **error);
void                g_input_stream_skip_async           (GInputStream *stream,
                                                         gsize count,
                                                         int io_priority,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);
gssize              g_input_stream_skip_finish          (GInputStream *stream,
                                                         GAsyncResult *result,
                                                         GError **error);
void                g_input_stream_close_async          (GInputStream *stream,
                                                         int io_priority,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);
gboolean            g_input_stream_close_finish         (GInputStream *stream,
                                                         GAsyncResult *result,
                                                         GError **error);
gboolean            g_input_stream_is_closed            (GInputStream *stream);
gboolean            g_input_stream_has_pending          (GInputStream *stream);
gboolean            g_input_stream_set_pending          (GInputStream *stream,
                                                         GError **error);
void                g_input_stream_clear_pending        (GInputStream *stream);

Object Hierarchy

  GObject
   +----GInputStream
         +----GFilterInputStream
         +----GFileInputStream
         +----GMemoryInputStream
         +----GUnixInputStream

Description

GInputStream has functions to read from a stream (g_input_stream_read()), to close a stream (g_input_stream_close()) and to skip some content (g_input_stream_skip()).

To copy the content of an input stream to an output stream without manually handling the reads and writes, use g_output_stream_splice().

All of these functions have async variants too.

Details

GInputStream

typedef struct _GInputStream GInputStream;

Base class for streaming input operations.


g_input_stream_read ()

gssize              g_input_stream_read                 (GInputStream *stream,
                                                         void *buffer,
                                                         gsize count,
                                                         GCancellable *cancellable,
                                                         GError **error);

Tries to read count bytes from the stream into the buffer starting at buffer. Will block during this read.

If count is zero returns zero and does nothing. A value of count larger than G_MAXSSIZE will cause a G_IO_ERROR_INVALID_ARGUMENT error.

On success, the number of bytes read into the buffer is returned. It is not an error if this is not the same as the requested size, as it can happen e.g. near the end of a file. Zero is returned on end of file (or if count is zero), but never otherwise.

If cancellable is not NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error.

On error -1 is returned and error is set accordingly.

stream :

a GInputStream.

buffer :

a buffer to read data into (which should be at least count bytes long).

count :

the number of bytes that will be read from the stream

cancellable :

optional GCancellable object, NULL to ignore.

error :

location to store the error occuring, or NULL to ignore

Returns :

Number of bytes read, or -1 on error

g_input_stream_read_all ()

gboolean            g_input_stream_read_all             (GInputStream *stream,
                                                         void *buffer,
                                                         gsize count,
                                                         gsize *bytes_read,
                                                         GCancellable *cancellable,
                                                         GError **error);

Tries to read count bytes from the stream into the buffer starting at buffer. Will block during this read.

This function is similar to g_input_stream_read(), except it tries to read as many bytes as requested, only stopping on an error or end of stream.

On a successful read of count bytes, or if we reached the end of the stream, TRUE is returned, and bytes_read is set to the number of bytes read into buffer.

If there is an error during the operation FALSE is returned and error is set to indicate the error status, bytes_read is updated to contain the number of bytes read into buffer before the error occurred.

stream :

a GInputStream.

buffer :

a buffer to read data into (which should be at least count bytes long).

count :

the number of bytes that will be read from the stream

bytes_read :

location to store the number of bytes that was read from the stream

cancellable :

optional GCancellable object, NULL to ignore.

error :

location to store the error occuring, or NULL to ignore

Returns :

TRUE on success, FALSE if there was an error

g_input_stream_skip ()

gssize              g_input_stream_skip                 (GInputStream *stream,
                                                         gsize count,
                                                         GCancellable *cancellable,
                                                         GError **error);

Tries to skip count bytes from the stream. Will block during the operation.

This is identical to g_input_stream_read(), from a behaviour standpoint, but the bytes that are skipped are not returned to the user. Some streams have an implementation that is more efficient than reading the data.

This function is optional for inherited classes, as the default implementation emulates it using read.

If cancellable is not NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error.

stream :

a GInputStream.

count :

the number of bytes that will be skipped from the stream

cancellable :

optional GCancellable object, NULL to ignore.

error :

location to store the error occuring, or NULL to ignore

Returns :

Number of bytes skipped, or -1 on error

g_input_stream_close ()

gboolean            g_input_stream_close                (GInputStream *stream,
                                                         GCancellable *cancellable,
                                                         GError **error);

Closes the stream, releasing resources related to it.

Once the stream is closed, all other operations will return G_IO_ERROR_CLOSED. Closing a stream multiple times will not return an error.

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 return G_IO_ERROR_CLOSED for all operations. Still, it is important to check and report the error to the user.

If cancellable is not NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. Cancelling a close will still leave the stream closed, but some streams can use a faster close that doesn't block to e.g. check errors.

stream :

A GInputStream.

cancellable :

optional GCancellable object, NULL to ignore.

error :

location to store the error occuring, or NULL to ignore

Returns :

TRUE on success, FALSE on failure

g_input_stream_read_async ()

void                g_input_stream_read_async           (GInputStream *stream,
                                                         void *buffer,
                                                         gsize count,
                                                         int io_priority,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);

Request an asynchronous read of count bytes from the stream into the buffer starting at buffer. When the operation is finished callback will be called. You can then call g_input_stream_read_finish() to get the result of the operation.

During an async request no other sync and async calls are allowed, and will result in G_IO_ERROR_PENDING errors.

A value of count larger than G_MAXSSIZE will cause a G_IO_ERROR_INVALID_ARGUMENT error.

On success, the number of bytes read into the buffer will be passed to the callback. It is not an error if this is not the same as the requested size, as it can happen e.g. near the end of a file, but generally we try to read as many bytes as requested. Zero is returned on end of file (or if count is zero), but never otherwise.

Any outstanding i/o request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_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.

stream :

A GInputStream.

buffer :

a buffer to read data into (which should be at least count bytes long).

count :

the number of bytes that will be read from the stream

io_priority :

the I/O priority of the request.

cancellable :

optional GCancellable object, NULL to ignore.

callback :

callback to call when the request is satisfied

user_data :

the data to pass to callback function

g_input_stream_read_finish ()

gssize              g_input_stream_read_finish          (GInputStream *stream,
                                                         GAsyncResult *result,
                                                         GError **error);

Finishes an asynchronous stream read operation.

stream :

a GInputStream.

result :

a GAsyncResult.

error :

a GError location to store the error occuring, or NULL to ignore.

Returns :

number of bytes read in, or -1 on error.

g_input_stream_skip_async ()

void                g_input_stream_skip_async           (GInputStream *stream,
                                                         gsize count,
                                                         int io_priority,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);

Request an asynchronous skip of count bytes from the stream into the buffer starting at buffer. When the operation is finished callback will be called. You can then call g_input_stream_skip_finish() to get the result of the operation.

During an async request no other sync and async calls are allowed, and will result in G_IO_ERROR_PENDING errors.

A value of count larger than G_MAXSSIZE will cause a G_IO_ERROR_INVALID_ARGUMENT error.

On success, the number of bytes skipped will be passed to the callback. It is not an error if this is not the same as the requested size, as it can happen e.g. near the end of a file, but generally we try to skip as many bytes as requested. Zero is returned on end of file (or if count is zero), but never otherwise.

Any outstanding i/o request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_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.

stream :

A GInputStream.

count :

the number of bytes that will be skipped from the stream

io_priority :

the I/O priority of the request.

cancellable :

optional GCancellable object, NULL to ignore.

callback :

callback to call when the request is satisfied

user_data :

the data to pass to callback function

g_input_stream_skip_finish ()

gssize              g_input_stream_skip_finish          (GInputStream *stream,
                                                         GAsyncResult *result,
                                                         GError **error);

Finishes a stream skip operation.

stream :

a GInputStream.

result :

a GAsyncResult.

error :

a GError location to store the error occuring, or NULL to ignore.

Returns :

the size of the bytes skipped, or -1 on error.

g_input_stream_close_async ()

void                g_input_stream_close_async          (GInputStream *stream,
                                                         int io_priority,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);

Requests an asynchronous closes of the stream, releasing resources related to it. When the operation is finished callback will be called. You can then call g_input_stream_close_finish() to get the result of the operation.

For behaviour details see g_input_stream_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.

stream :

A GInputStream.

io_priority :

the I/O priority of the request.

cancellable :

optional cancellable object

callback :

callback to call when the request is satisfied

user_data :

the data to pass to callback function

g_input_stream_close_finish ()

gboolean            g_input_stream_close_finish         (GInputStream *stream,
                                                         GAsyncResult *result,
                                                         GError **error);

Finishes closing a stream asynchronously, started from g_input_stream_close_async().

stream :

a GInputStream.

result :

a GAsyncResult.

error :

a GError location to store the error occuring, or NULL to ignore.

Returns :

TRUE if the stream was closed successfully.

g_input_stream_is_closed ()

gboolean            g_input_stream_is_closed            (GInputStream *stream);

Checks if an input stream is closed.

stream :

input stream.

Returns :

TRUE if the stream is closed.

g_input_stream_has_pending ()

gboolean            g_input_stream_has_pending          (GInputStream *stream);

Checks if an input stream has pending actions.

stream :

input stream.

Returns :

TRUE if stream has pending actions.

g_input_stream_set_pending ()

gboolean            g_input_stream_set_pending          (GInputStream *stream,
                                                         GError **error);

Sets stream to have actions pending. If the pending flag is already set or stream is closed, it will return FALSE and set error.

stream :

input stream

error :

a GError location to store the error occuring, or NULL to ignore.

Returns :

TRUE if pending was previously unset and is now set.

g_input_stream_clear_pending ()

void                g_input_stream_clear_pending        (GInputStream *stream);

Clears the pending flag on stream.

stream :

input stream