bug如题目所描述。尝试过将按钮的image指向的变量del_icon设置为global全局变量,但是不成功,会提示如“

attributeerror: ‘photoimage’ object has no attribute ‘_photoimage__photo’

”的错误。代码1是导致bug的源头。

        代码1:

#!/bin/env python3
from pil import imagetk
import tkinter as tk
...
self.del_button = tk.button(self.frame, text='del', width=20, height=20)
self.del_button.config(image=imagetk.photoimage(resize(os.getcwd() + '/delete.png', 0)))
self.del_button.bind('<button-1>', self.delete_selected_image)
self.del_button.grid(row=0, column=0, sticky=tk.w)

        结果删除按钮不显示image,按钮上显示空白:

del_button的image不显示

        尝试将del_button的image指向的变量设置为局部变量,即下面所展示的代码2。

        代码2:

#!/bin/env python3
from pil import imagetk
import tkinter as tk
...
self.del_button = tk.button(self.frame, text='del', width=20, height=20)
del_icon = imagetk.photoimage(resize(os.getcwd()+'/delete.png', 0))
self.del_button.config(image=del_icon)
self.del_button.bind('<button-1>', self.delete_selected_image)
self.del_button.grid(row=0, column=0, sticky=tk.w)

        结果删除按钮的image显示正常:

del_button的image显示正常

         笔记:

                不明所以的bug。判断潜在原因是:gc的问题。image属性需要指向明确的内存地址。方法返回的临时变量地址调用后即被回收,导致image指向空地址。

        resize()的代码:

#!/bin/env python3
from pil import image
 
def resize(path):
    image = image.open(path)
    raw_width, raw_height = image.size[0], image.size[1]
    min_height = 20
    min_width = int(raw_width * min_height / raw_height)
    return image.resize((min_width, min_height))

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