问在django管理中验证图像大小

EN

from django.core.files.images import get_image_dimensions
from django.contrib import admin
from django import forms

class myForm(forms.ModelForm):
   class Meta:
       model = myModel
   def clean_picture(self):
       picture = self.cleaned_data.get("picture")
       if not picture:
           raise forms.ValidationError("No image!")
       else:
           w, h = get_image_dimensions(picture)
           if w != 100:
               raise forms.ValidationError("The image is %i pixel wide. It's supposed to be 100px" % w)
           if h != 200:
               raise forms.ValidationError("The image is %i pixel high. It's supposed to be 200px" % h)
       return picture

class MyAdmin(admin.ModelAdmin):
    form = myForm

admin.site.register(Example, MyAdmin)

from django.core.exceptions import ValidationError

def validate_image(fieldfile_obj):
    filesize = fieldfile_obj.file.size
    megabyte_limit = 2.0
    if filesize > megabyte_limit*1024*1024:
        raise ValidationError("Max file size is %sMB" % str(megabyte_limit))

class Company(models.Model):
    logo = models.ImageField("Logo", upload_to=upload_logo_to,validators=[validate_image], blank=True, null=True,help_text='Maximum file size allowed is 2Mb')

from django.core.exceptions import ValidationError
from django.core.files.images import get_image_dimensions

class Model(models.Model):
 photo = models.ImageField()

 def clean(self):

    if not self.photo:
        raise ValidationError("No image!")
    else:
        w, h = get_image_dimensions(self.photo)
        if w != 200:
            raise ValidationError("The image is %i pixel wide. It's supposed to be 200px" % w)
        if h != 200:
            raise ValidationError("The image is %i pixel high. It's supposed to be 200px" % h)