Question

在学习tkinter的过程中，我遇到了一个问题：我无法将图像添加到按钮中：

from tkinter import*
from tkinter import ttk

root=Tk()

button=ttk.Button(root)
button.grid()
photo=PhotoImage(file="giphy.gif")
button.config(image=photo, compound=RIGHT)

root.mainloop()

该代码出错：

<ipython-input-30-6ad3ebb78b5b> in <module>()
      7 button.grid()
      8 photo=PhotoImage(file="giphy.gif")
----> 9 button.config(image=photo, compound=RIGHT)
     10 
     11 root.mainloop()

/usr/lib/python3.5/tkinter/__init__.py in configure(self, cnf, **kw)
   1331         the allowed keyword arguments call the method keys.
   1332         """
-> 1333         return self._configure('configure', cnf, kw)
   1334     config = configure
   1335     def cget(self, key):

/usr/lib/python3.5/tkinter/__init__.py in _configure(self, cmd, cnf, kw)
   1322         if isinstance(cnf, str):
   1323             return self._getconfigure1(_flatten((self._w, cmd, '-'+cnf)))
-> 1324         self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
   1325     # These used to be defined in Widget:
   1326     def configure(self, cnf=None, **kw):

TclError: image "pyimage.." doesn't exist

为什么会这样？我该如何解决？

Answer 1

正如furas在评论中所说，您的代码可以通过interface TreeElem { <T> T accept(TreeVisitor<T> visitor); } class Leaf implements TreeElem { public <T> T accept(TreeVisitor<T> visitor) { return visitor.visit(this); } } class Split implements TreeElem { private TreeElem left; private TreeElem right; Split(TreeElem left, TreeElem right) { this.left = left; this.right = right; } public <T> T accept(TreeVisitor<T> visitor) { return visitor.combine( visitor.visit(this), left.accept(visitor), right.accept(visitor)); } } interface TreeVisitor<T> { T visit(Leaf tree); T visit(Split tree); T combine(T... inputs); } class Printer implements TreeVisitor<CharSequence> { public CharSequence combine(CharSequence... inputs) { StringBuilder text = new StringBuilder(); for (CharSequence input : inputs) { text.append(input); } return text; } public CharSequence visit(Leaf tree) { return "leaf"; } public CharSequence visit(Split tree) { return "split"; } } public class MWEjava { public static void main(String[] args) { TreeElem tree = new Split(new Leaf(), new Leaf()); Printer printer = new Printer(); System.out.println(tree.accept(printer)); } }完全运行。

错误来自您在Jupyter QtConsole中运行它的事实。为了能够在Jupyter QtConsole中运行它，您需要明确告诉tkinter python script.py的父窗口是什么。我认为这是因为在控制台中，默认父级不是您创建的PhotoImage实例，而是一些隐藏窗口。因此，图像的父级不是按钮的父级，因此tkinter找不到图像。

以下代码应在控制台中运行：

Tk

将图像添加到按钮中

1 个答案: