_tkinter.TclError：图像“ ...”不存在_ ImageGrab.grab

如何解决_tkinter.TclError：图像“ ...”不存在_ ImageGrab.grab

代码摘要：将tk.Button ['image']更改为所选文件或屏幕截图

我收到此错误：

_tkinter.TclError: image "<PIL.Image.Image image mode=RGB size=600x400 at 0x34045F0>" doesn't exist

但是我不明白为什么它不存在，因为如果我使用print(self.image_selected)，我会得到

<PIL.Image.Image image mode=RGB size=600x400 at 0x3D16650>

是否需要是全局变量？不添加self可以解决此问题吗？

代码

import tkinter as tk
from tkinter import filedialog
from PIL import ImageGrab,ImageTk

class MCVE():
    def __init__(self,master):
        self.master = master
        self.ButtonOne = tk.Button(text="start",width=30,height=30,command = lambda: self.GetImg(master))
        self.ButtonOne.pack()
        self.image_selected = None
    def GetImg(self,master):
        self.newWin = tk.Toplevel(self.master)
        self.ButtonTwo = tk.Button(self.newWin,text="snip",command = lambda: self.Snip(self.master))
        self.ButtonThree = tk.Button(self.newWin,text="open",command = lambda: self.FileO(self.master))
        self.ButtonTwo.pack()
        self.ButtonThree.pack()
    def Snip(self,master):
        self.image_selected = ImageGrab.grab(bbox=(0,600,400))
        self.changeImg()
    def FileO(self,master):
        ret = filedialog.askopenfilename()  # filedialog.askopenfilename(initialdir='/home/user/images/')
        if ret:
            self.image_selected = ImageTk.PhotoImage(file=ret)
        self.changeImg()
    def changeImg(self):
        if self.image_selected:
            print(self.image_selected)
            #self.ButtonOne['image'] = self.image_selected
            self.ButtonOne.config(image=self.image_selected)


def main():
    root = tk.Tk()
    MCVE(root)
    root.mainloop()


if __name__ == '__main__':
    main()

解决方法

我测试了该程序，正如您所说，“ snip”按钮给了我错误。我可以通过将图像格式更改为ImageTk.PhotoImage来解决它。

    def Snip(self,master):
        self.image_selected = ImageTk.PhotoImage(ImageGrab.grab(bbox=(0,600,400)))
        self.changeImg()

我不得不说，选择图像后在按钮图标上显示的照片很奇怪，但是我想这是因为我以错误的分辨率对其进行了测试！ ;）