如何通过单击 Python 中的 Tkinter 按钮来接受图像作为用户输入？

Question

我正在编写一个图像处理程序，需要在单击 Tkinter 按钮后获取图像作为用户输入。

这是我的代码：

root = tk.Tk()
#root.withdraw()
def file():
    file = askopenfile(mode ='r', filetypes =[('JPG File', '*.jpg'),('PNG File','*.png')], encoding="utf8")
    if file is not None:
        content = file.read()
        print(content)


open = tk.Button(root, text ="Open Image",command= lambda : file())
open.pack()
root.mainloop()

错误：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "C:/Users/Admin/.PyCharmCE2019.1/config/scratches/scratch_3.py", line 18, in <lambda>
    open = tk.Button(root, text ="Open Image",command= lambda : file())
  File "C:/Users/Admin/.PyCharmCE2019.1/config/scratches/scratch_3.py", line 12, in file
    file = askopenfile(mode ='r', filetypes =[('JPG File', '*.jpg'),('PNG File','*.png')], encoding="utf8")
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python37\lib\tkinter\filedialog.py", line 396, in askopenfile
    filename = Open(**options).show()
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python37\lib\tkinter\commondialog.py", line 43, in show
    s = w.tk.call(self.command, *w._options(self.options))
_tkinter.TclError: bad option "-encoding": must be -defaultextension, -filetypes, -initialdir, -initialfile, -multiple, -parent, -title, or -typevariable

Answer 1

这是因为您将错误的模式传递给askopenfile。您正在传递mode='r'，但它应该是mode='rb'，因为图片是字节，您还需要删除encoding 参数。