## GDrive

GDrive — Virtual File System drive management

## Synopsis

    #include <gio/gio.h>

                        GDrive;
                        GDriveIface;
    char *              g_drive_get_name                    (GDrive *drive);
    GIcon *             g_drive_get_icon                    (GDrive *drive);
    gboolean            g_drive_has_volumes                 (GDrive *drive);
    GList *             g_drive_get_volumes                 (GDrive *drive);
    gboolean            g_drive_can_eject                   (GDrive *drive);
    gboolean            g_drive_can_poll_for_media          (GDrive *drive);
    void                g_drive_poll_for_media              (GDrive *drive,
                                                             GCancellable *cancellable,
                                                             GAsyncReadyCallback callback,
                                                             gpointer user_data);
    gboolean            g_drive_poll_for_media_finish       (GDrive *drive,
                                                             GAsyncResult *result,
                                                             GError **error);
    gboolean            g_drive_has_media                   (GDrive *drive);
    gboolean            g_drive_is_media_check_automatic    (GDrive *drive);
    gboolean            g_drive_is_media_removable          (GDrive *drive);
    void                g_drive_eject                       (GDrive *drive,
                                                             GMountUnmountFlags flags,
                                                             GCancellable *cancellable,
                                                             GAsyncReadyCallback callback,
                                                             gpointer user_data);
    gboolean            g_drive_eject_finish                (GDrive *drive,
                                                             GAsyncResult *result,
                                                             GError **error);
    char **             g_drive_enumerate_identifiers       (GDrive *drive);
    char *              g_drive_get_identifier              (GDrive *drive,
                                                             const char *kind);

## Object Hierarchy

      GInterface
       +----GDrive

## Prerequisites

GDrive requires GObject.

## Signals

      "changed"                                        : Run Last
      "disconnected"                                   : Run Last
      "eject-button"                                   : Run Last

## Description

GDrive - this represent a piece of hardware connected to the machine. Its generally only created for removable hardware or hardware with removable media.

GDrive is a container class for GVolume objects that stem from the same piece of media. As such, GDrive abstracts a drive with (or without) removable media and provides operations for querying whether media is available, determing whether media change is automatically detected and ejecting the media.

If the GDrive reports that media isn't automatically detected, one can poll for media; typically one should not do this periodically as a poll for media operation is potententially expensive and may spin up the drive creating noise.

For porting from GnomeVFS note that there is no equivalent of GDrive in that API.

## Details

### GDrive

    typedef struct _GDrive GDrive;

Opaque drive object.

### GDriveIface

    typedef struct {
      GTypeInterface g_iface;

      /* signals */
      void     (* changed)                  (GDrive              *drive);
      void     (* disconnected)             (GDrive              *drive);
      void     (* eject_button)             (GDrive              *drive);

      /* Virtual Table */
      char *   (* get_name)                 (GDrive              *drive);
      GIcon *  (* get_icon)                 (GDrive              *drive);
      gboolean (* has_volumes)              (GDrive              *drive);
      GList *  (* get_volumes)              (GDrive              *drive);
      gboolean (* is_media_removable)       (GDrive              *drive);
      gboolean (* has_media)                (GDrive              *drive);
      gboolean (* is_media_check_automatic) (GDrive              *drive);
      gboolean (* can_eject)                (GDrive              *drive);
      gboolean (* can_poll_for_media)       (GDrive              *drive);
      void     (* eject)                    (GDrive              *drive,
                                             GMountUnmountFlags   flags,
                                             GCancellable        *cancellable,
                                             GAsyncReadyCallback  callback,
                                             gpointer             user_data);
      gboolean (* eject_finish)             (GDrive              *drive,
                                             GAsyncResult        *result,
                                             GError             **error);
      void     (* poll_for_media)           (GDrive              *drive,
                                             GCancellable        *cancellable,
                                             GAsyncReadyCallback  callback,
                                             gpointer             user_data);
      gboolean (* poll_for_media_finish)    (GDrive              *drive,
                                             GAsyncResult        *result,
                                             GError             **error);

      char *   (* get_identifier)           (GDrive              *drive,
                                             const char          *kind);
      char **  (* enumerate_identifiers)    (GDrive              *drive);
    } GDriveIface;

Interface for creating GDrive implementations.

GTypeInterface `g_iface`; | The parent interface.
`changed` () | Signal emitted when the drive is changed.
`disconnected` () | The removed signal that is emitted when the GDrive have been disconnected. If the recipient is holding references to the object they should release them so the object can be finalized.
`eject_button` () | Signal emitted when the physical eject button (if any) of a drive have been pressed.
`get_name` () | Returns the name for the given GDrive.
`get_icon` () | Returns a GIcon for the given GDrive.
`has_volumes` () | Returns `TRUE` if the GDrive has mountable volumes.
`get_volumes` () | Returns a list GList of GVolume for the GDrive.
`is_media_removable` () | Returns `TRUE` if the GDrive supports removal and insertion of media.
`has_media` () | Returns `TRUE` if the GDrive has media inserted.
`is_media_check_automatic` () | Returns `TRUE` if the GDrive is capabable of automatically detecting media changes.
`can_eject` () | Returns `TRUE` if the GDrive can eject media.
`can_poll_for_media` () | Returns `TRUE` if the GDrive is capable of manually polling for media change.
`eject` () | Ejects a GDrive.
`eject_finish` () | Finishes an eject operation.
`poll_for_media` () | Poll for media insertion/removal on a GDrive.
`poll_for_media_finish` () | Finishes a media poll operation.
`get_identifier` () | Returns the identifier of the given kind, or `NULL` if the GDrive doesn't have one.
`enumerate_identifiers` () | Returns an array strings listing the kinds of identifiers which the GDrive has.

### g_drive_get_name ()

    char *              g_drive_get_name                    (GDrive *drive);

Gets the name of `drive`.

`drive` : | a GDrive.
Returns : | a string containing `drive`'s name. The returned string should be freed when no longer needed.

### g_drive_get_icon ()

    GIcon *             g_drive_get_icon                    (GDrive *drive);

Gets the icon for `drive`.

`drive` : | a GDrive.
Returns : | GIcon for the `drive`. Free the returned object with `g_object_unref()`.

### g_drive_has_volumes ()

    gboolean            g_drive_has_volumes                 (GDrive *drive);

Check if `drive` has any mountable volumes.

`drive` : | a GDrive.
Returns : | `TRUE` if the `drive` contains volumes, `FALSE` otherwise.

### g_drive_get_volumes ()

    GList *             g_drive_get_volumes                 (GDrive *drive);

Get a list of mountable volumes for `drive`.

The returned list should be freed with `g_list_free()`, after its elements have been unreffed with `g_object_unref()`.

`drive` : | a GDrive.
Returns : | GList containing any GVolume objects on the given `drive`.

### g_drive_can_eject ()

    gboolean            g_drive_can_eject                   (GDrive *drive);

Checks if a drive can be ejected.

`drive` : | a GDrive.
Returns : | `TRUE` if the `drive` can be ejected, `FALSE` otherwise.

### g_drive_can_poll_for_media ()

    gboolean            g_drive_can_poll_for_media          (GDrive *drive);

Checks if a drive can be polled for media changes.

`drive` : | a GDrive.
Returns : | `TRUE` if the `drive` can be polled for media changes, `FALSE` otherwise.

### g_drive_poll_for_media ()

    void                g_drive_poll_for_media              (GDrive *drive,
                                                             GCancellable *cancellable,
                                                             GAsyncReadyCallback callback,
                                                             gpointer user_data);

Asynchronously polls `drive` to see if media has been inserted or removed.

When the operation is finished, `callback` will be called. You can then call `g_drive_poll_for_media_finish()` to obtain the result of the operation.

`drive` : | a GDrive.
`cancellable` : | optional GCancellable object, `NULL` to ignore.
`callback` : | a GAsyncReadyCallback, or `NULL`.
`user_data` : | user data to pass to `callback`

### g_drive_poll_for_media_finish ()

    gboolean            g_drive_poll_for_media_finish       (GDrive *drive,
                                                             GAsyncResult *result,
                                                             GError **error);

Finishes an operation started with `g_drive_poll_for_media()` on a drive.

`drive` : | a GDrive.
`result` : | a GAsyncResult.
`error` : | a GError, or `NULL`
Returns : | `TRUE` if the drive has been poll_for_mediaed successfully, `FALSE` otherwise.

### g_drive_has_media ()

    gboolean            g_drive_has_media                   (GDrive *drive);

Checks if the `drive` has media. Note that the OS may not be polling the drive for media changes; see `g_drive_is_media_check_automatic()` for more details.

`drive` : | a GDrive.
Returns : | `TRUE` if `drive` has media, `FALSE` otherwise.

### g_drive_is_media_check_automatic ()

    gboolean            g_drive_is_media_check_automatic    (GDrive *drive);

Checks if `drive` is capabable of automatically detecting media changes.

`drive` : | a GDrive.
Returns : | `TRUE` if the `drive` is capabable of automatically detecting media changes, `FALSE` otherwise.

### g_drive_is_media_removable ()

    gboolean            g_drive_is_media_removable          (GDrive *drive);

Checks if the `drive` supports removable media.

`drive` : | a GDrive.
Returns : | `TRUE` if `drive` supports removable media, `FALSE` otherwise.

### g_drive_eject ()

    void                g_drive_eject                       (GDrive *drive,
                                                             GMountUnmountFlags flags,
                                                             GCancellable *cancellable,
                                                             GAsyncReadyCallback callback,
                                                             gpointer user_data);

Asynchronously ejects a drive.

When the operation is finished, `callback` will be called. You can then call `g_drive_eject_finish()` to obtain the result of the operation.

`drive` : | a GDrive.
`flags` : | flags affecting the unmount if required for eject
`cancellable` : | optional GCancellable object, `NULL` to ignore.
`callback` : | a GAsyncReadyCallback, or `NULL`.
`user_data` : | user data to pass to `callback`

### g_drive_eject_finish ()

    gboolean            g_drive_eject_finish                (GDrive *drive,
                                                             GAsyncResult *result,
                                                             GError **error);

Finishes ejecting a drive.

`drive` : | a GDrive.
`result` : | a GAsyncResult.
`error` : | a GError, or `NULL`
Returns : | `TRUE` if the drive has been ejected successfully, `FALSE` otherwise.

### g_drive_enumerate_identifiers ()

    char **             g_drive_enumerate_identifiers       (GDrive *drive);

Gets the kinds of identifiers that `drive` has. Use `g_drive_get_identifer()` to obtain the identifiers themselves.

`drive` : | a GDrive
Returns : | a `NULL`-terminated array of strings containing kinds of identifiers. Use `g_strfreev()` to free.

### g_drive_get_identifier ()

    char *              g_drive_get_identifier              (GDrive *drive,
                                                             const char *kind);

Gets the identifier of the given kind for `drive`.

`drive` : | a GDrive
`kind` : | the kind of identifier to return
Returns : | a newly allocated string containing the requested identfier, or `NULL` if the GDrive doesn't have this kind of identifier.

## Signal Details

### The `"changed"` signal

    void                user_function                      (GDrive  *drive,
                                                            gpointer user_data)      : Run Last

Emitted when the drive's state has changed.

`drive` : | a GDrive.
`user_data` : | user data set when the signal handler was connected.

### The `"disconnected"` signal

    void                user_function                      (GDrive  *drive,
                                                            gpointer user_data)      : Run Last

This signal is emitted when the GDrive have been disconnected. If the recipient is holding references to the object they should release them so the object can be finalized.

`drive` : | a GDrive.
`user_data` : | user data set when the signal handler was connected.

### The `"eject-button"` signal

    void                user_function                      (GDrive  *drive,
                                                            gpointer user_data)      : Run Last

Emitted when the physical eject button (if any) of a drive has been pressed.

`drive` : | a GDrive.
`user_data` : | user data set when the signal handler was connected.