class Gio::FileIOStream

Overview

GFileIOStream provides io streams that both read and write to the same file handle.

GFileIOStream implements #GSeekable, which allows the io 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 io stream, use g_seekable_tell().

To find out if a file io stream supports seeking, use g_seekable_can_seek(). To position a file io stream, use g_seekable_seek(). To find out if a file io stream supports truncating, use g_seekable_can_truncate(). To truncate a file io stream, use g_seekable_truncate().

The default implementation of all the #GFileIOStream operations and the implementation of #GSeekable just call into the same operations on the output stream.

Included Modules

Defined in:

lib/gi-crystal/src/auto/gio-2.0/file_io_stream.cr

Constructors

Class Method Summary

Instance Method Summary

Instance methods inherited from module Gio::Seekable

can_seek : Bool can_seek, can_truncate : Bool can_truncate, seek(offset : Int64, type : GLib::SeekType, cancellable : Gio::Cancellable?) : Bool seek, tell : Int64 tell, to_unsafe to_unsafe, truncate(offset : Int64, cancellable : Gio::Cancellable?) : Bool truncate

Class methods inherited from module Gio::Seekable

g_type : UInt64 g_type

Instance methods inherited from class Gio::IOStream

clear_pending : Nil clear_pending, close(cancellable : Gio::Cancellable?) : Bool close, close_async(io_priority : Int32, cancellable : Gio::Cancellable?, callback : Gio::AsyncReadyCallback?, user_data : Pointer(Void)?) : Nil close_async, close_finish(result : Gio::AsyncResult) : Bool close_finish, closed? : Bool closed?, has_pending : Bool has_pending, input_stream : Gio::InputStream input_stream, is_closed : Bool is_closed, output_stream : Gio::OutputStream output_stream, set_pending : Bool set_pending, splice_async(stream2 : Gio::IOStream, flags : Gio::IOStreamSpliceFlags, io_priority : Int32, cancellable : Gio::Cancellable?, callback : Gio::AsyncReadyCallback?, user_data : Pointer(Void)?) : Nil splice_async, splice_finish(result : Gio::AsyncResult) : Bool splice_finish

Constructor methods inherited from class Gio::IOStream

new
new(*, closed : Bool? = nil, input_stream : Gio::InputStream? = nil, output_stream : Gio::OutputStream? = nil)
new

Class methods inherited from class Gio::IOStream

g_type : UInt64 g_type

Instance methods inherited from class GObject::Object

bind_property(source_property : String, target : GObject::Object, target_property : String, flags : GObject::BindingFlags) : GObject::Binding bind_property, bind_property_full(source_property : String, target : GObject::Object, target_property : String, flags : GObject::BindingFlags, transform_to : GObject::Closure, transform_from : GObject::Closure) : GObject::Binding bind_property_full, data(key : String) : Pointer(Void)? data, finalize finalize, freeze_notify : Nil freeze_notify, getv(names : Enumerable(String), values : Enumerable(_)) : Nil getv, notify(property_name : String) : Nil notify, notify_by_pspec(pspec : GObject::ParamSpec) : Nil notify_by_pspec, notify_signal notify_signal, property(property_name : String, value : _) : Nil property, qdata(quark : UInt32) : Pointer(Void)? qdata, ref_count : UInt32 ref_count, run_dispose : Nil run_dispose, set_data(key : String, data : Pointer(Void)?) : Nil set_data, set_property(property_name : String, value : _) : Nil set_property, steal_data(key : String) : Pointer(Void)? steal_data, steal_qdata(quark : UInt32) : Pointer(Void)? steal_qdata, thaw_notify : Nil thaw_notify, to_unsafe : Pointer(Void) to_unsafe, watch_closure(closure : GObject::Closure) : Nil watch_closure

Constructor methods inherited from class GObject::Object

cast(obj : GObject::Object) : self cast, cast?(obj : GObject::Object) : self? cast?, new(pointer, transfer : GICrystal::Transfer)
new
new
, newv(object_type : UInt64, parameters : Enumerable(GObject::Parameter)) : self newv

Class methods inherited from class GObject::Object

compat_control(what : UInt64, data : Pointer(Void)?) : UInt64 compat_control, g_type : UInt64 g_type, interface_find_property(g_iface : GObject::TypeInterface, property_name : String) : GObject::ParamSpec interface_find_property, interface_list_properties(g_iface : GObject::TypeInterface) : Enumerable(GObject::ParamSpec) interface_list_properties

Constructor Detail

def self.new #

Initialize a new FileIOStream.


def self.new(*, closed : Bool? = nil, input_stream : Gio::InputStream? = nil, output_stream : Gio::OutputStream? = nil) #

Class Method Detail

def self.g_type : UInt64 #

Returns the type id (GType) registered in GLib type system.


Instance Method Detail

def etag : String? #

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.


def query_info(attributes : String, cancellable : Gio::Cancellable?) : 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 g_file_io_stream_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 %G_IO_ERROR_PENDING.

Can fail if the stream was already closed (with @error being set to %G_IO_ERROR_CLOSED), the stream has pending operations (with @error being set to %G_IO_ERROR_PENDING), or if querying info is not supported for the stream's interface (with @error being set to %G_IO_ERROR_NOT_SUPPORTED). I all cases of failure, %NULL will be returned.

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 set, and %NULL will be returned.


def query_info_async(attributes : String, io_priority : Int32, cancellable : Gio::Cancellable?, callback : Gio::AsyncReadyCallback?, user_data : Pointer(Void)?) : Nil #

Asynchronously queries the @stream for a #GFileInfo. When completed, @callback will be called with a #GAsyncResult which can be used to finish the operation with g_file_io_stream_query_info_finish().

For the synchronous version of this function, see g_file_io_stream_query_info().


def query_info_finish(result : Gio::AsyncResult) : Gio::FileInfo #

Finalizes the asynchronous query started by g_file_io_stream_query_info_async().