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Tasty Multimedia Journal's Forum Nokia Blog
Unique, sortable filenames with Python
kevin_s2f | 31 July, 2007 01:32
I finally got some time to work on this code. I've accomplished some relatively minor tasks:
I thought through the best way to name and organize files. Time-stamping is a good way to pull unique names on the fly, and that's how LFD does it in the camera-and-viewfinder example over in the Wiki.
import time
ctime = time.localtime()
picName = str(ctime[0])+str(ctime[1])+str(ctime[2])+str(ctime[3])+str(ctime[4])+str(ctime[5])
Working with that assignment a bit, I didn't like the way it treated months and days -- January 11 comes out the same as November 1.
So I used formatting like this:
import time
ctime = time.localtime()
fileNameRoot = '%4i%02i%02i%02i%02i%02i' % ((ctime[0]), (ctime[1]), (ctime[2]), (ctime[3]), (ctime[4]), (ctime[5]))
This allows me to assign filenames by the time when the first version was created, update the files as necessary (by adding more audio to a recording, for example,) and still reliably sort by first creation.
This lead me relatively quickly to split the image and audio files into separate directories. Using the same root file names for both the image files and audio files lets me put them back together easily (before I dig into the database engine). Separating them into two directories allows me to fill a listbox with elements drawn from one directory and not have to manually eliminate duplicates.
So that leaves me with the code below. Next step is to factor out the construction of the primary listbox so I can re-build it after adding a record.
import e32, appuifw, time
import cameraandview
debug = 1
picPath = u'e:tmjimages' # remember first '' escapes the character.
audPath = u'e:tmjaudio'
# ToDo: add code to catch and process SymbianError -12 KErrPathNotFound if path does not yet exist.
def takepic(aPath, aFilename):
import camera
# save UI elements
oldBody = appuifw.app.body
oldExit = appuifw.app.exit_key_handler
oldFocus = appuifw.app.focus
oldMenu = appuifw.app.menu
oldScreen = appuifw.app.screen
oldTitle = appuifw.app.title
if debug: appuifw.app.title = u'Let us take a picture here.'
im = camera.take_photo() # use all default values -- eventually this fn will change *.body into canvas control for viewfinder
im.save(aPath + aFilename)
#restore UI elements
appuifw.app.body = oldBody
appuifw.app.exit_key_handler = oldExit
appuifw.app.focus = oldFocus
appuifw.app.menu = oldMenu
appuifw.app.screen = oldScreen
appuifw.app.title = oldTitle
def recordaudio(aPath, aFilename):
import e32, audio
if debug: appuifw.note(u'hello from inside recordaudio',)
s = audio.Sound.open(aPath + aFilename) # if file exists, append sound to end
s.record() # start recording
e32.ao_sleep(5) # do if for 5 seconds
s.stop() # stop recording
# the file is now created, ready to be played
# s.play()
def handle_selection():
appuifw.note(u'hello from inside handle_selection',)
index = lb.current()
code = choices[index][1]
lb.set_list([u'Please wait...'])
if code == 'new':
# construct unique name root that's easily sortable by time.
ctime = time.localtime()
fileNameRoot = '%4i%02i%02i%02i%02i%02i' % ((ctime[0]), (ctime[1]), (ctime[2]), (ctime[3]), (ctime[4]), (ctime[5]))
if debug: appuifw.note(u'here is where we process a new experience', 'info')
picName = fileNameRoot + u'.jpg'
takepic (picPath, picName)
if debug: appuifw.note(u'back to handle_selection after takepic',)
audName = fileNameRoot + u'.amr'
recordaudio (audPath, audName)
elif code == 'comment':
if debug: appuifw.note(u'here is where we add a comment', 'info')
fileNameRoot = choices[index][0]
fileNameRoot = fileNameRoot[8:] # strip off 'comment ' from UI
audName = fileNameRoot + u'.amr'
recordaudio (audPath, audName)
else:
appuifw.note(u'no valide code detected', 'info')
lb.set_list(choices_labels)
def handle_add():
pass
def handle_delete():
pass
def exit_key_handler():
app_lock.signal()
# todo -- need to factor this out so handle_selection / new can re-build the lb
choices =[(u'New experience', 'new')]
picFiles = []
for item in os.listdir(picPath):
if not item[0] == '_': picFiles.append(unicode(item[:-4])) # strip off file extension
picFiles.sort() # just in case it does not come from directory already sorted
picFiles.reverse() # and show last addition first
for item in picFiles:
choices.append( (u'Comment ' + item, 'comment') ) # todo strip off extra chars b4 displaying
choices_labels = [x[0] for x in choices]
lb = appuifw.Listbox(choices_labels, handle_selection)
appuifw.app.title = u'Tasty Multimedia Journal'
appuifw.app.body = lb
appuifw.app.menu = [(u'Add new item', handle_add),
(u'Delete item', handle_delete)]
appuifw.app.exit_key_handler = exit_key_handler
if debug: appuifw.note(u'prepare to lock',)
app_lock = e32.Ao_lock()
if debug: appuifw.note(u'and now we wait',)
app_lock.wait()
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