我正在尝试为文件字段创建MP3验证程序。验证器接收file_path作为参数，并执行所有必要的逻辑来验证mp3文件。
我的问题是，当调用验证器时，我无法为函数提供整个路径。当我打印file_name变量时，我只获取文件名而不是整个路径。
有谁能告诉我如何使用models.FileField（）访问文件的完整路径？
验证
from django.forms import ValidationError
def isMp3Valid(file_path):
print (file_path)
is_valid = False
f = open(file_path, 'r')
block = f.read(1024)
frame_start = block.find(chr(255))
block_count = 0 #abort after 64k
while len(block)>0 and frame_start == -1 and block_count<64:
block = f.read(1024)
frame_start = block.find(chr(255))
block_count+=1
if frame_start > -1:
frame_hdr = block[frame_start:frame_start+4]
is_valid = frame_hdr[0] == chr(255)
mpeg_version = ''
layer_desc = ''
uses_crc = False
bitrate = 0
sample_rate = 0
padding = False
frame_length = 0
if is_valid:
is_valid = ord(frame_hdr[1]) & 0xe0 == 0xe0 #validate the rest of the frame_sync bits exist
if is_valid:
if ord(frame_hdr[1]) & 0x18 == 0:
mpeg_version = '2.5'
elif ord(frame_hdr[1]) & 0x18 == 0x10:
mpeg_version = '2'
elif ord(frame_hdr[1]) & 0x18 == 0x18:
mpeg_version = '1'
else:
is_valid = False
if is_valid:
if ord(frame_hdr[1]) & 6 == 2:
layer_desc = 'Layer III'
elif ord(frame_hdr[1]) & 6 == 4:
layer_desc = 'Layer II'
elif ord(frame_hdr[1]) & 6 == 6:
layer_desc = 'Layer I'
else:
is_valid = False
if is_valid:
uses_crc = ord(frame_hdr[1]) & 1 == 0
bitrate_chart = [
[0,0,0,0,0],
[32,32,32,32,8],
[64,48,40,48,16],
[96,56,48,56,24],
[128,64,56,64,32],
[160,80,64,80,40],
[192,96,80,96,40],
[224,112,96,112,56],
[256,128,112,128,64],
[288,160,128,144,80],
[320,192,160,160,96],
[352,224,192,176,112],
[384,256,224,192,128],
[416,320,256,224,144],
[448,384,320,256,160]]
bitrate_index = ord(frame_hdr[2]) >> 4
if bitrate_index==15:
is_valid=False
else:
bitrate_col = 0
if mpeg_version == '1':
if layer_desc == 'Layer I':
bitrate_col = 0
elif layer_desc == 'Layer II':
bitrate_col = 1
else:
bitrate_col = 2
else:
if layer_desc == 'Layer I':
bitrate_col = 3
else:
bitrate_col = 4
bitrate = bitrate_chart[bitrate_index][bitrate_col]
is_valid = bitrate > 0
if is_valid:
sample_rate_chart = [
[44100, 22050, 11025],
[48000, 24000, 12000],
[32000, 16000, 8000]]
sample_rate_index = (ord(frame_hdr[2]) & 0xc) >> 2
if sample_rate_index != 3:
sample_rate_col = 0
if mpeg_version == '1':
sample_rate_col = 0
elif mpeg_version == '2':
sample_rate_col = 1
else:
sample_rate_col = 2
sample_rate = sample_rate_chart[sample_rate_index][sample_rate_col]
else:
is_valid = False
if is_valid:
padding = ord(frame_hdr[2]) & 1 == 1
padding_length = 0
if layer_desc == 'Layer I':
if padding:
padding_length = 4
frame_length = (12 * bitrate * 1000 / sample_rate + padding_length) * 4
else:
if padding:
padding_length = 1
frame_length = 144 * bitrate * 1000 / sample_rate + padding_length
is_valid = frame_length > 0
# Verify the next frame
if(frame_start + frame_length < len(block)):
is_valid = block[frame_start + frame_length] == chr(255)
else:
offset = (frame_start + frame_length) - len(block)
block = f.read(1024)
if len(block) > offset:
is_valid = block[offset] == chr(255)
else:
is_valid = False
f.close()
if not is_valid:
raise ValidationError(_("El archivo no es formato MP3"))
return is_valid
型号：
from django.utils.translation import ugettext as _
from django.db import models
from music_manager.extra import isMp3Valid
class Cancion(models.Model):
nombre = models.CharField(max_length=100,verbose_name=_("nombre"))
audio_file = models.FileField(upload_to="/static/audio", verbose_name=_("audio"),validators=[isMp3Valid])
class Meta:
verbose_name_plural= "Canciones"
verbose_name = "Cancion"
# Override the __unicode__() method to return out something meaningful!
def __unicode__(self):
return self.nombre
答案 0 :(得分：2)
Django使用值audio_file调用您的验证程序。因此，您的isMp3Valid - Validator方法会收到django.db.models.fields.files.FieldFile的实例。此类有一个名为file的属性，它是django.core.files.base.File。
File类有一个名为name的属性。 name的值应为audio_file的绝对路径。
您的验证器应该像这样更改：
def is_mp3_valid(audio_file):
file_path = audio_file.file.name
is_valid = False
f = open(file_path, 'r')
.... (snip) ...
我希望这会对你有所帮助。