Question

我有一个url列表，每个url只包含一个图像，我想使用python在单个tkinter画布上显示所有图像，列表中包含一些不包含图像的url tkinter应该忽略那些网址。

我创建的代码一次只能显示一个图像。

import io
import base64
try:
    # Python2
    import Tkinter as tk
    from urllib2 import urlopen
except ImportError:
    # Python3
    import tkinter as tk
    from urllib.request import urlopen
root = tk.Tk()
root.title("display a website image")

w = 800
h = 600
x = 200
y = 300

root.geometry("%dx%d+%d+%d" % (w, h, x, y))


image_url = "http://www.okclipart.com/img2/yrdulrdklckodbfcqsuy.png"
image_byt = urlopen(image_url).read()
image_b64 = base64.encodestring(image_byt)
photo = tk.PhotoImage(data=image_b64)

cv = tk.Canvas(bg='white')
cv.pack(side='top', fill='both', expand='yes')
cv.create_image(10, 10, image=photo, anchor='nw')
root.mainloop()

图片样本列表网址

urllist =['https://upload.wikimedia.org/wikipedia/commons/thumb/d/d0/NoCopyright.png/600px-NoCopyright.png','http://www.okclipart.com/img16/kjlhjznjvkokwqpalupl.png'
,'http://www.okclipart.com/img16/qcmwejvtwuufltxsibbn.png',
'http://www.okclipart.com/img2/yrdulrdklckodbfcqsuy.png']

此外，列表中还有一些不包含任何图像的网址，因此它会忽略这些网址。

Answer 1

忽略无效网址：try ... except urllib2.HTTPError将为您提供帮助
加载多张图片：浏览urllist并加载每张图片。成功后，将其绘制到画布上。

#from urllib.request import HTTPError #py3
#from urllib2 import HTTPError #py2
#... 
def load_image_to_base64(image_url):
    """ Load an image from a web url and return its data base64 encoded"""
    image_byt = urlopen(image_url).read()
    image_b64 = base64.encodestring(image_byt)
    return image_b64

# load photos to photos list
urllist = ['http://www.okclipart.com/img16/kjlhjznjvkokwqpalupl.png', 
           'invalidurltest', 
           'http://www.okclipart.com/YouWontFindThisImage.png']
photos = []
for i, url in enumerate(urllist):
    print(i,"loading",url)
    try:
        photo = tk.PhotoImage(data=load_image_to_base64(url))
        photos.append(photo)
        print("done")
    except HTTPError as err:
        print("image not found, http error code:", err.code)
    except ValueError:
        print("invalid url", url)

# iterate through photos and put them onto the canvas
for photo in photos:
    cv.create_image(10*i, 10*i, image=photo, anchor='nw')

root.mainloop()
#...

如何使用Python在单个Tkinter画布中显示来自多个URL的多个图像

1 个答案: