libmtp: The folder management API.

# The folder management API.

## Functions
LIBMTP_folder_t * | LIBMTP_new_folder_t (void)
void | LIBMTP_destroy_folder_t (LIBMTP_folder_t *)
LIBMTP_folder_t * | LIBMTP_Get_Folder_List (LIBMTP_mtpdevice_t *)
LIBMTP_folder_t * | LIBMTP_Find_Folder (LIBMTP_folder_t *, uint32_t const)
uint32_t | LIBMTP_Create_Folder (LIBMTP_mtpdevice_t *, char *, uint32_t, uint32_t)
int | LIBMTP_Set_Folder_Name (LIBMTP_mtpdevice_t *, LIBMTP_folder_t *, const char *)

## Function Documentation

uint32_t LIBMTP_Create_Folder | ( | LIBMTP_mtpdevice_t * | device,
|  | char * | name,
|  | uint32_t | parent_id,
|  | uint32_t | storage_id |
| ) |  |  |

This create a folder on the current MTP device. The PTP name for a folder is "association". The PTP/MTP devices does not have an internal "folder" concept really, it contains a flat list of all files and some file are "associations" that other files and folders may refer to as its "parent".

Parameters:

  | device | a pointer to the device to create the folder on.
  | name | the name of the new folder.
  | parent_id | id of parent folder to add the new folder to, or 0 to put it in the root directory.
  | storage_id | id of the storage to add this new folder to. notice that you cannot mismatch storage id and parent id: they must both be on the same storage! Pass in 0 if you want to create this folder on the default storage.

Returns:
  id to new folder or 0 if an error occured

References LIBMTP_mtpdevice_struct::params, strip_7bit_from_utf8(), and LIBMTP_mtpdevice_struct::usbinfo.

void LIBMTP_destroy_folder_t | ( | LIBMTP_folder_t * | folder | ) |

This recursively deletes the memory for a folder structure. This shall typically be called on a top-level folder list to detsroy the entire folder tree.

Parameters:

  | folder | folder structure to destroy

See also:
  LIBMTP_new_folder_t()

References LIBMTP_folder_struct::child, LIBMTP_destroy_folder_t(), LIBMTP_folder_struct::name, and LIBMTP_folder_struct::sibling.

Referenced by LIBMTP_destroy_folder_t().

LIBMTP_folder_t* LIBMTP_Find_Folder | ( | LIBMTP_folder_t * | folderlist,
|  | uint32_t | id |
| ) |  |  |

Helper function. Returns a folder structure for a specified id.

Parameters:

  | folderlist | list of folders to search id of folder to look for

Returns:
  a folder or NULL if not found

References LIBMTP_folder_struct::child, LIBMTP_folder_struct::folder_id, LIBMTP_Find_Folder(), and LIBMTP_folder_struct::sibling.

Referenced by LIBMTP_Find_Folder().

LIBMTP_folder_t* LIBMTP_Get_Folder_List | ( | LIBMTP_mtpdevice_t * | device | ) |

This returns a list of all folders available on the current MTP device.

Parameters:

  | device | a pointer to the device to get the folder listing for.

Returns:
  a list of folders

References LIBMTP_mtpdevice_struct::params.

Referenced by playlist_t_to_spl(), and spl_to_playlist_t().

LIBMTP_folder_t* LIBMTP_new_folder_t | ( | void |  | ) |

This creates a new folder structure and allocates memory for it. Notice that if you add strings to this structure they will be freed by the corresponding `LIBMTP_folder_track_t` operation later, so be careful of using strdup() when assigning strings, e.g.:

Returns:
  a pointer to the newly allocated folder structure.

See also:
  LIBMTP_destroy_folder_t()

References LIBMTP_folder_struct::folder_id.

int LIBMTP_Set_Folder_Name | ( | LIBMTP_mtpdevice_t * | device,
|  | LIBMTP_folder_t * | folder,
|  | const char * | newname |
| ) |  |  |

This function renames a single folder. This simply means that the PTP_OPC_ObjectFileName property is updated, if this is supported by the device.

Parameters:

  | device | a pointer to the device that contains the file.
  | folder | the folder metadata of the folder to rename. On success, the name member is updated. Be aware, that this name can be different than newname depending of device restrictions.
  | newname | the new name for this object.

Returns:
  0 on success, any other value means failure.

References LIBMTP_folder_struct::folder_id, and LIBMTP_folder_struct::name.