Gio.FileEnumerator¶

Subclasses:: None

Methods¶

Inherited:: GObject.Object (37)
Structs:: GObject.ObjectClass (5)

	`close` (cancellable)
	`close_async` (io_priority, cancellable, callback, *user_data)
	`close_finish` (result)
	`get_child` (info)
	`get_container` ()
	`has_pending` ()
	`is_closed` ()
	`iterate` (cancellable)
	`next` ()
	`next_file` (cancellable)
	`next_files_async` (num_files, io_priority, cancellable, callback, *user_data)
	`next_files_finish` (result)
	`set_pending` (pending)

Virtual Methods¶

Inherited:: GObject.Object (7)

	`do_close_async` (io_priority, cancellable, callback, *user_data)
	`do_close_finish` (result)
	`do_close_fn` (cancellable)
	`do_next_file` (cancellable)
	`do_next_files_async` (num_files, io_priority, cancellable, callback, *user_data)
	`do_next_files_finish` (result)

Properties¶

Name	Type	Flags	Short Description
`container`	`Gio.File`	w/co	The container that is being enumerated

Signals¶

Inherited:: GObject.Object (1)

Fields¶

Inherited:: GObject.Object (1)

Name	Type	Access	Description
parent_instance	`GObject.Object`	r

Class Details¶

class Gio.FileEnumerator(**kwargs)¶

Bases:: GObject.Object
Abstract:: No
Structure:: Gio.FileEnumeratorClass

Gio.FileEnumerator allows you to operate on a set of Gio.Files, returning a Gio.FileInfo structure for each file enumerated (e.g. Gio.File.enumerate_children() will return a Gio.FileEnumerator for each of the children within a directory).

To get the next file’s information from a Gio.FileEnumerator, use Gio.FileEnumerator.next_file() or its asynchronous version, Gio.FileEnumerator.next_files_async(). Note that the asynchronous version will return a list of Gio.FileInfos, whereas the synchronous will only return the next file in the enumerator.

The ordering of returned files is unspecified for non-Unix platforms; for more information, see GLib.Dir.read_name(). On Unix, when operating on local files, returned files will be sorted by inode number. Effectively you can assume that the ordering of returned files will be stable between successive calls (and applications) assuming the directory is unchanged.

If your application needs a specific ordering, such as by name or modification time, you will have to implement that in your application code.

To close a Gio.FileEnumerator, use Gio.FileEnumerator.close(), or its asynchronous version, Gio.FileEnumerator.close_async(). Once a Gio.FileEnumerator is closed, no further actions may be performed on it, and it should be freed with GObject.Object.unref().

close(cancellable)[source]¶

Parameters:: cancellable (Gio.Cancellable or None) – optional Gio.Cancellable object, None to ignore.
Raises:: GLib.Error
Returns:: True on success or False on error.
Return type:: bool

Releases all resources used by this enumerator, making the enumerator return Gio.IOErrorEnum.CLOSED on all calls.

This will be automatically called when the last reference is dropped, but you might want to call this function to make sure resources are released as early as possible.

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

Parameters:

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 closes the file enumerator.

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 returned in Gio.FileEnumerator.close_finish().

close_finish(result)[source]¶

Parameters:: result (Gio.AsyncResult) – a Gio.AsyncResult.
Raises:: GLib.Error
Returns:: True if the close operation has finished successfully.
Return type:: bool

Finishes closing a file enumerator, started from Gio.FileEnumerator.close_async().

If the file enumerator was already closed when Gio.FileEnumerator.close_async() was called, then this function will report Gio.IOErrorEnum.CLOSED in error, and return False. If the file enumerator had pending operation when the close operation was started, then this function will report Gio.IOErrorEnum.PENDING, and return False. If cancellable was not None, then the operation may have been cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error Gio.IOErrorEnum.CANCELLED will be set, and False will be returned.

get_child(info)[source]¶

Parameters:: info (Gio.FileInfo) – a Gio.FileInfo gotten from Gio.FileEnumerator.next_file() or the async equivalents.
Returns:: a Gio.File for the Gio.FileInfo passed it.
Return type:: Gio.File

Return a new Gio.File which refers to the file named by info in the source directory of self. This function is primarily intended to be used inside loops with Gio.FileEnumerator.next_file().

To use this, Gio.FILE_ATTRIBUTE_STANDARD_NAME must have been listed in the attributes list used when creating the Gio.FileEnumerator.

This is a convenience method that’s equivalent to:

gchar *name = g_file_info_get_name (info);
GFile *child = g_file_get_child (g_file_enumerator_get_container (enumr),
                                 name);

New in version 2.36.

get_container()[source]¶

Returns:: the Gio.File which is being enumerated.
Return type:: Gio.File

Get the Gio.File container which is being enumerated.

New in version 2.18.

has_pending()[source]¶

Returns:: True if the self has pending operations.
Return type:: bool

Checks if the file enumerator has pending operations.

is_closed()[source]¶

Returns:: True if the self is closed.
Return type:: bool

Checks if the file enumerator has been closed.

iterate(cancellable)[source]¶

Parameters:

cancellable (Gio.Cancellable or None) – a Gio.Cancellable

Raises:

GLib.Error

Returns:

out_info:: Output location for the next Gio.FileInfo, or None
out_child:: Output location for the next Gio.File, or None

Return type:

(bool, out_info: Gio.FileInfo, out_child: Gio.File)

This is a version of Gio.FileEnumerator.next_file() that’s easier to use correctly from C programs. With Gio.FileEnumerator.next_file(), the bool return value signifies “end of iteration or error”, which requires allocation of a temporary GLib.Error.

In contrast, with this function, a False return from Gio.FileEnumerator.iterate() *always* means “error”. End of iteration is signaled by out_info or out_child being None.

Another crucial difference is that the references for out_info and out_child are owned by self (they are cached as hidden properties). You must not unref them in your own code. This makes memory management significantly easier for C code in combination with loops.

Finally, this function optionally allows retrieving a Gio.File as well.

You must specify at least one of out_info or out_child.

The code pattern for correctly using Gio.FileEnumerator.iterate() from C is:

direnum = g_file_enumerate_children (file, ...);
while (TRUE)
  {
    GFileInfo *info;
    if (!g_file_enumerator_iterate (direnum, &info, NULL, cancellable, error))
      goto out;
    if (!info)
      break;
    ... do stuff with "info"; do not unref it! ...
  }

out:
  g_object_unref (direnum); // Note: frees the last @info

New in version 2.44.

next()¶

next_file(cancellable)[source]¶

Parameters:: cancellable (Gio.Cancellable or None) – optional Gio.Cancellable object, None to ignore.
Raises:: GLib.Error
Returns:: A Gio.FileInfo or None on error or end of enumerator. Free the returned object with GObject.Object.unref() when no longer needed.
Return type:: Gio.FileInfo or None

Returns information for the next file in the enumerated object. Will block until the information is available. The Gio.FileInfo returned from this function will contain attributes that match the attribute string that was passed when the Gio.FileEnumerator was created.

See the documentation of Gio.FileEnumerator for information about the order of returned files.

On error, returns None and sets error to the error. If the enumerator is at the end, None will be returned and error will be unset.

next_files_async(num_files, io_priority, cancellable, callback, *user_data)[source]¶

Parameters:

num_files (int) – the number of file info objects to request
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

Request information for a number of files from the enumerator asynchronously. When all I/O for the operation is finished the callback will be called with the requested information.

See the documentation of Gio.FileEnumerator for information about the order of returned files.

Once the end of the enumerator is reached, or if an error occurs, the callback will be called with an empty list. In this case, the previous call to Gio.FileEnumerator.next_files_async() will typically have returned fewer than num_files items.

If a request is cancelled the callback will be called with Gio.IOErrorEnum.CANCELLED.

This leads to the following pseudo-code usage:

g_autoptr(GFile) dir = get_directory ();
g_autoptr(GFileEnumerator) enumerator = NULL;
g_autolist(GFileInfo) files = NULL;
g_autoptr(GError) local_error = NULL;

enumerator = yield g_file_enumerate_children_async (dir,
                                                    G_FILE_ATTRIBUTE_STANDARD_NAME ","
                                                    G_FILE_ATTRIBUTE_STANDARD_TYPE,
                                                    G_FILE_QUERY_INFO_NONE,
                                                    G_PRIORITY_DEFAULT,
                                                    cancellable,
                                                    …,
                                                    &local_error);
if (enumerator == NULL)
  g_error ("Error enumerating: %s", local_error->message);

// Loop until no files are returned, either because the end of the enumerator
// has been reached, or an error was returned.
do
  {
    files = yield g_file_enumerator_next_files_async (enumerator,
                                                      5,  // number of files to request
                                                      G_PRIORITY_DEFAULT,
                                                      cancellable,
                                                      …,
                                                      &local_error);

    // Process the returned files, but don’t assume that exactly 5 were returned.
    for (GList *l = files; l != NULL; l = l->next)
      {
        GFileInfo *info = l->data;
        handle_file_info (info);
      }
  }
while (files != NULL);

if (local_error != NULL &&
    !g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
  g_error ("Error while enumerating: %s", local_error->message);

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

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is GLib.PRIORITY_DEFAULT.

next_files_finish(result)[source]¶

Parameters:: result (Gio.AsyncResult) – a Gio.AsyncResult.
Raises:: GLib.Error
Returns:: a GLib.List of Gio.FileInfos. You must free the list with g_list_free() and unref the infos with GObject.Object.unref() when you’re done with them.
Return type:: [Gio.FileInfo]

Finishes the asynchronous operation started with Gio.FileEnumerator.next_files_async().

set_pending(pending)[source]¶

Parameters:: pending (bool) – a boolean value.

Sets the file enumerator as having pending operations.

do_close_async(io_priority, cancellable, callback, *user_data) virtual¶

Parameters:

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 closes the file enumerator.

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 returned in Gio.FileEnumerator.close_finish().

do_close_finish(result) virtual¶

Parameters:: result (Gio.AsyncResult) – a Gio.AsyncResult.
Returns:: True if the close operation has finished successfully.
Return type:: bool

Finishes closing a file enumerator, started from Gio.FileEnumerator.close_async().

If the file enumerator was already closed when Gio.FileEnumerator.close_async() was called, then this function will report Gio.IOErrorEnum.CLOSED in error, and return False. If the file enumerator had pending operation when the close operation was started, then this function will report Gio.IOErrorEnum.PENDING, and return False. If cancellable was not None, then the operation may have been cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error Gio.IOErrorEnum.CANCELLED will be set, and False will be returned.

do_close_fn(cancellable) virtual¶

Parameters:: cancellable (Gio.Cancellable or None) –
Return type:: bool

do_next_file(cancellable) virtual¶

Parameters:: cancellable (Gio.Cancellable or None) – optional Gio.Cancellable object, None to ignore.
Returns:: A Gio.FileInfo or None on error or end of enumerator. Free the returned object with GObject.Object.unref() when no longer needed.
Return type:: Gio.FileInfo or None

Returns information for the next file in the enumerated object. Will block until the information is available. The Gio.FileInfo returned from this function will contain attributes that match the attribute string that was passed when the Gio.FileEnumerator was created.

See the documentation of Gio.FileEnumerator for information about the order of returned files.

On error, returns None and sets error to the error. If the enumerator is at the end, None will be returned and error will be unset.

do_next_files_async(num_files, io_priority, cancellable, callback, *user_data) virtual¶

Parameters:

num_files (int) – the number of file info objects to request
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

Request information for a number of files from the enumerator asynchronously. When all I/O for the operation is finished the callback will be called with the requested information.

See the documentation of Gio.FileEnumerator for information about the order of returned files.

Once the end of the enumerator is reached, or if an error occurs, the callback will be called with an empty list. In this case, the previous call to Gio.FileEnumerator.next_files_async() will typically have returned fewer than num_files items.

If a request is cancelled the callback will be called with Gio.IOErrorEnum.CANCELLED.

This leads to the following pseudo-code usage:

g_autoptr(GFile) dir = get_directory ();
g_autoptr(GFileEnumerator) enumerator = NULL;
g_autolist(GFileInfo) files = NULL;
g_autoptr(GError) local_error = NULL;

enumerator = yield g_file_enumerate_children_async (dir,
                                                    G_FILE_ATTRIBUTE_STANDARD_NAME ","
                                                    G_FILE_ATTRIBUTE_STANDARD_TYPE,
                                                    G_FILE_QUERY_INFO_NONE,
                                                    G_PRIORITY_DEFAULT,
                                                    cancellable,
                                                    …,
                                                    &local_error);
if (enumerator == NULL)
  g_error ("Error enumerating: %s", local_error->message);

// Loop until no files are returned, either because the end of the enumerator
// has been reached, or an error was returned.
do
  {
    files = yield g_file_enumerator_next_files_async (enumerator,
                                                      5,  // number of files to request
                                                      G_PRIORITY_DEFAULT,
                                                      cancellable,
                                                      …,
                                                      &local_error);

    // Process the returned files, but don’t assume that exactly 5 were returned.
    for (GList *l = files; l != NULL; l = l->next)
      {
        GFileInfo *info = l->data;
        handle_file_info (info);
      }
  }
while (files != NULL);

if (local_error != NULL &&
    !g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
  g_error ("Error while enumerating: %s", local_error->message);

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

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is GLib.PRIORITY_DEFAULT.

do_next_files_finish(result) virtual¶

Parameters:: result (Gio.AsyncResult) – a Gio.AsyncResult.
Returns:: a GLib.List of Gio.FileInfos. You must free the list with g_list_free() and unref the infos with GObject.Object.unref() when you’re done with them.
Return type:: [Gio.FileInfo]

Finishes the asynchronous operation started with Gio.FileEnumerator.next_files_async().

Property Details¶

Gio.FileEnumerator.props.container¶

Name:: container
Type:: Gio.File
Default Value:: None
Flags:: WRITABLE, CONSTRUCT_ONLY

The container that is being enumerated