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:
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#!/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:
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:
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#!/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:
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:
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#!/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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原文链接:https://blog.csdn.net/qq_21264377/article/details/119523050