Linux Certif

Toute la documentation sur la certification Linux LPI

njb_datatagapi

NAME

The datafile tag (metadata) retrieveal API -

Defines

#define NJB_Get_File NJB_Get_Track

#define NJB_Get_File_fd NJB_Get_Track_fd

Functions

void NJB_Reset_Get_Datafile_Tag (njb_t *njb)

njb_datafile_t * NJB_Get_Datafile_Tag (njb_t *njb)

void NJB_Datafile_Destroy (njb_datafile_t *df)

int NJB_Send_File (njb_t *njb, const char *path, const char *name, const char *folder, NJB_Xfer_Callback *callback, void *data, u_int32_t *fileid)

int NJB_Delete_Datafile (njb_t *njb, u_int32_t fileid)

int NJB_Create_Folder (njb_t *njb, const char *name, u_int32_t *folderid)

Function Documentation

int NJB_Create_Folder (njb_t * njb, const char * name, u_int32_t * folderid)This function creates a new folder on the device, if the device supports folder creation.

Parameters:

njb a pointer to the njb_t jukebox object to use
name the name of the new folder to create
folderid a pointer to a variable that will hold the new item ID for the folder if it is successfully created.

Returns:

0 on success, -1 on failure. Notice that a case of failure is when an NJB1 is used, so this should normally result in 'not implemented' error.

References njb_struct::device_type, and NJB_DEVICE_NJB1.

void NJB_Datafile_Destroy (njb_datafile_t * df)Destroys a datafile struct.

Parameters:

df the datafile struct to destroy

References njb_datafile_struct::filename, and njb_datafile_struct::folder.

Referenced by datafile_unpack(), and NJB_Send_File().

int NJB_Delete_Datafile (njb_t * njb, u_int32_t fileid)This deletes a datafile from the device.

Parameters:

njb a pointer to the njb_t jukebox object to use
fileid the file ID for the file to delete

Returns:

0 on success, -1 on failure

Examples: delfile.c.

References njb_struct::device_type, EO_BADCOUNT, and NJB_DEVICE_NJB1.

njb_datafile_t* NJB_Get_Datafile_Tag (njb_t * njb)This gets a datafile tag from the device. The device should first be rewound using the NJB_Reset_Get_Datafile_Tag() function. The tag is newly allocated and should be destroyed with NJB_Datafile_Destroy() after use.

Parameters:

njb a pointer to the njb_t object to get datafiles from

Returns:

a datafile tag or NULL if the last datafile tag has already been returned

See also:

NJB_Reset_Get_Datafile_Tag()

Examples: files.c, and getfile.c.

References njb_struct::device_type, NJB_DEVICE_NJB1, and njb_struct::protocol_state.

void NJB_Reset_Get_Datafile_Tag (njb_t * njb)This resets the datafile metadata retrieveal function. The datafile tags can then be retrieved one by one using the NJB_Get_Datafile_Tag() function.

Typical usage:

 
  njb_t *njb;
  njb_datafile_t *df;
 

  NJB_Reset_Get_Datafile_Tag(njb);
  while ( (df = NJB_Get_Datafile_Tag(njb)) != NULL ) {
     // Do something with all the datafiles...
     NJB_Datafile_Destroy(df);
  }
  
 

Parameters:

njb a pointer to the njb_t object to reset the datafile retrieveal pointer for

See also:

NJB_Get_Datafile_Tag()

Examples: files.c, and getfile.c.

References njb_struct::device_type, njb3_reset_get_datafile_tag(), NJB_DEVICE_NJB1, and njb_struct::protocol_state.

int NJB_Send_File (njb_t * njb, const char * path, const char * name, const char * folder, NJB_Xfer_Callback * callback, void * data, u_int32_t * fileid)This function sends a datafile to the device (downloads), optionally using a folder name.

Parameters:

njb a pointer to the njb_t object to send the file to
path a path to the file that shall be downloaded.
name a filename to use for this file on the device. Should only be the basename, excluding any folder name(s).
folder a folder name to use for this file on the device. Not all devices support folders, so this might be ignored. A folder name must begin and end with backslash (\) and have levels of hierarchy separated by backslashes too, like this: '\foo\bar\fnord\'.
callback a function that will be called repeatedly to report progress during transfer, used for e.g. displaying progress bars. This may be NULL if you don't like callbacks.
data a voluntary parameter that can associate some user-supplied data with each callback call. It is OK to set this to NULL of course.
fileid a pointer to a variable that will hold the new file ID when the operation is finished.

Returns:

0 on success, -1 on failure.

Examples: sendfile.c.

References _file_size(), _file_time(), datafile_pack(), datafile_pack3(), datafile_set_folder(), datafile_set_name(), datafile_set_size(), datafile_set_time(), njb_struct::device_type, EO_INVALID, EO_SRCFILE, EO_TOOBIG, EO_XFERDENIED, NJB_Datafile_Destroy(), NJB_DEVICE_NJB1, and njb_get_disk_usage().

Author

Generated automatically by Doxygen for libnjb from the source code.