如何使用Python在单个Tkinter画布中显示来自多个Url的多个图像

Question

我有一个url列表，每个url只包含一个图像，并且我希望在单个tkinter画布上使用Python也显示所有图像列表包含一些不包含图像的网址，tkinter应该忽略这些网址。

我创建了一次只显示一个图像的代码。

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() 

图像的样本名单网址

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'] 

还有一些在不包含任何图像，所以它768,16忽略这些URL列表中的一些网址。

Answer 1

1. 忽略无效的网址：try ... except urllib2.HTTPError将帮助您完成此
2. 加载多个图像：通过您的urllist反复测试，并加载每个这些图像。成功时，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() 
#...