Gio.FileIOStream¶

Subclasses:: None

Methods¶

Inherited:: Gio.IOStream (11), GObject.Object (37), Gio.Seekable (5)
Structs:: GObject.ObjectClass (5)

	`get_etag` ()
	`query_info` (attributes, cancellable)
	`query_info_async` (attributes, io_priority, cancellable, callback, *user_data)
	`query_info_finish` (result)

Virtual Methods¶

Inherited:: Gio.IOStream (5), GObject.Object (7), Gio.Seekable (5)

	`do_can_seek` ()
	`do_can_truncate` ()
	`do_get_etag` ()
	`do_query_info` (attributes, cancellable)
	`do_query_info_async` (attributes, io_priority, cancellable, callback, *user_data)
	`do_query_info_finish` (result)
	`do_seek` (offset, type, cancellable)
	`do_tell` ()
	`do_truncate_fn` (size, cancellable)

Properties¶

Inherited:: Gio.IOStream (3)

Signals¶

Inherited:: GObject.Object (1)

Fields¶

Inherited:: GObject.Object (1)

Name	Type	Access	Description
parent_instance	`Gio.IOStream`	r

Class Details¶

class Gio.FileIOStream(**kwargs)¶

Bases:: Gio.IOStream, Gio.Seekable
Abstract:: No
Structure:: Gio.FileIOStreamClass

GFileIOStream provides I/O streams that both read and write to the same file handle.

GFileIOStream implements [iface`Gio`.Seekable], which allows the I/O stream to jump to arbitrary positions in the file and to truncate the file, provided the filesystem of the file supports these operations.

To find the position of a file I/O stream, use [method`Gio`.Seekable.tell].

To find out if a file I/O stream supports seeking, use [method`Gio`.Seekable.can_seek]. To position a file I/O stream, use [method`Gio`.Seekable.seek]. To find out if a file I/O stream supports truncating, use [method`Gio`.Seekable.can_truncate]. To truncate a file I/O stream, use [method`Gio`.Seekable.truncate].

The default implementation of all the GFileIOStream operations and the implementation of [iface`Gio`.Seekable] just call into the same operations on the output stream.

New in version 2.22.

get_etag()[source]¶

Returns:: the entity tag for the stream.
Return type:: str or None

Gets the entity tag for the file when it has been written. This must be called after the stream has been written and closed, as the etag can change while writing.

New in version 2.22.

query_info(attributes, cancellable)[source]¶

Parameters:

attributes (str) – a file attribute query string.
cancellable (Gio.Cancellable or None) – optional Gio.Cancellable object, None to ignore.

Raises:

GLib.Error

Returns:

a Gio.FileInfo for the self, or None on error.

Return type:

Gio.FileInfo

Queries a file io stream for the given attributes. This function blocks while querying the stream. For the asynchronous version of this function, see Gio.FileIOStream.query_info_async(). While the stream is blocked, the stream will set the pending flag internally, and any other operations on the stream will fail with Gio.IOErrorEnum.PENDING.

Can fail if the stream was already closed (with error being set to Gio.IOErrorEnum.CLOSED), the stream has pending operations (with error being set to Gio.IOErrorEnum.PENDING), or if querying info is not supported for the stream’s interface (with error being set to Gio.IOErrorEnum.NOT_SUPPORTED). I all cases of failure, None will be returned.

If cancellable is not None, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error Gio.IOErrorEnum.CANCELLED will be set, and None will be returned.

New in version 2.22.

query_info_async(attributes, io_priority, cancellable, callback, *user_data)[source]¶

Parameters:

attributes (str) – a file attribute query string.
io_priority (int) – the I/O priority of the request
cancellable (Gio.Cancellable or None) – optional Gio.Cancellable object, None to ignore.
callback (Gio.AsyncReadyCallback or None) – a Gio.AsyncReadyCallback to call when the request is satisfied
user_data (object or None) – the data to pass to callback function

Asynchronously queries the self for a Gio.FileInfo. When completed, callback will be called with a Gio.AsyncResult which can be used to finish the operation with Gio.FileIOStream.query_info_finish().

For the synchronous version of this function, see Gio.FileIOStream.query_info().

New in version 2.22.

query_info_finish(result)[source]¶

Parameters:: result (Gio.AsyncResult) – a Gio.AsyncResult.
Raises:: GLib.Error
Returns:: A Gio.FileInfo for the finished query.
Return type:: Gio.FileInfo

Finalizes the asynchronous query started by Gio.FileIOStream.query_info_async().

New in version 2.22.

do_can_seek() virtual¶

Return type:: bool

do_can_truncate() virtual¶

Return type:: bool

do_get_etag() virtual¶

Returns:: the entity tag for the stream.
Return type:: str or None

Gets the entity tag for the file when it has been written. This must be called after the stream has been written and closed, as the etag can change while writing.

New in version 2.22.

do_query_info(attributes, cancellable) virtual¶

Parameters:

attributes (str) – a file attribute query string.
cancellable (Gio.Cancellable or None) – optional Gio.Cancellable object, None to ignore.

Returns:

a Gio.FileInfo for the stream, or None on error.

Return type:

Gio.FileInfo

Queries a file io stream for the given attributes. This function blocks while querying the stream. For the asynchronous version of this function, see Gio.FileIOStream.query_info_async(). While the stream is blocked, the stream will set the pending flag internally, and any other operations on the stream will fail with Gio.IOErrorEnum.PENDING.

Can fail if the stream was already closed (with error being set to Gio.IOErrorEnum.CLOSED), the stream has pending operations (with error being set to Gio.IOErrorEnum.PENDING), or if querying info is not supported for the stream’s interface (with error being set to Gio.IOErrorEnum.NOT_SUPPORTED). I all cases of failure, None will be returned.

If cancellable is not None, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error Gio.IOErrorEnum.CANCELLED will be set, and None will be returned.

New in version 2.22.

do_query_info_async(attributes, io_priority, cancellable, callback, *user_data) virtual¶

Parameters:

attributes (str) – a file attribute query string.
io_priority (int) – the I/O priority of the request
cancellable (Gio.Cancellable or None) – optional Gio.Cancellable object, None to ignore.
callback (Gio.AsyncReadyCallback or None) – a Gio.AsyncReadyCallback to call when the request is satisfied
user_data (object or None) – the data to pass to callback function

Asynchronously queries the stream for a Gio.FileInfo. When completed, callback will be called with a Gio.AsyncResult which can be used to finish the operation with Gio.FileIOStream.query_info_finish().

For the synchronous version of this function, see Gio.FileIOStream.query_info().

New in version 2.22.

do_query_info_finish(result) virtual¶

Parameters:: result (Gio.AsyncResult) – a Gio.AsyncResult.
Returns:: A Gio.FileInfo for the finished query.
Return type:: Gio.FileInfo

Finalizes the asynchronous query started by Gio.FileIOStream.query_info_async().

New in version 2.22.

do_seek(offset, type, cancellable) virtual¶

Parameters:

offset (int) –
type (GLib.SeekType) –
cancellable (Gio.Cancellable or None) –

Return type:

bool

do_tell() virtual¶

Return type:: int

do_truncate_fn(size, cancellable) virtual¶

Parameters:

size (int) –
cancellable (Gio.Cancellable or None) –

Return type:

bool