Python Tkinter PhotoImage [英] Python Tkinter PhotoImage

问题描述

这是目前代码的格式：

import Tkinter as tk

class mycustomwidow:
    def __init__(self,parent,......)
        ......
        ......
        tk.Label(parent,image=Myimage)
        tk.pack(side='top')

def main():
    root=tk.Tk()
    mycustomwindow(root)
    root.mainlopp()

if __name__ == '__main__':
    main()

我的问题是：我应该在哪里声明我在类中使用的照片 Myimage mycustomwindow

My problem is: Where should I declare the photo Myimage that I used in my class mycustomwindow?

如果我把 Myimage = tk.PhotoImage（data ='....'）在 root = tk.Tk（）之前，如下所示，它会给我太早创建图像错误，因为我们无法在根窗口之前创建一个图像。

If I put Myimage=tk.PhotoImage(data='....') before the root=tk.Tk() like below, it will give me the too early to create image error as we can't create an image before the root window.

import Tkinter as tk
Myimage=tk.PhotoImage(data='....') 
class mycustomwidow:
    def __init__(self,parent,......)
        ......
        ......
        tk.Label(parent,image=Myimage)
        tk.pack(side='top')

def main():
    root=tk.Tk()
    mycustomwindow(root)
    root.mainlopp()

if __name__ == '__main__':
    main()

如果我把 Myimage = tk.PhotoImage（data ='.... ）在函数 main（），这样，它说它找不到图像 Myimage in class mycustomwindow 。

If I put Myimage=tk.PhotoImage(data='....') in the function main() like this, it says it can't find the image Myimage in class mycustomwindow.

import Tkinter as tk

class mycustomwidow:
    def __init__(self,parent,......)
        ......
        ......
        tk.Label(parent,image=Myimage)
        tk.pack(side='top')

def main():
    root=tk.Tk()
    Myimage=tk.PhotoImage(data='....')
    mycustomwindow(root)
    root.mainlopp()

if __name__ == '__main__':
    main()

我的代码结构有什么严重错误吗？在哪里应该声明 Myimage ，以便它可以在中使用class mycustomwindow ？

Is there anything badly wrong with my code structure? Where should I declare Myimage so that it can be used in class mycustomwindow?

<> 初始化 Tk（）（第一种方法中的问题）

1. you create it after initializing Tk() (the problem in your first approach)
2. the image is in the variable scope when you are using it (the problem in your second approach)
3. the image object does not get garbage-collected (another common pitfall)

如果你在 main（）方法中定义图像，那么你必须使它全局

If you define the image in your main() method, then you will have to make it global

class MyCustomWindow(Tkinter.Frame):
    def __init__(self, parent):
        Tkinter.Frame.__init__(self, parent)
        Tkinter.Label(self, image=image).pack()
        self.pack(side='top')

def main():
    root = Tkinter.Tk()
    global image # make image known in global scope
    image = Tkinter.PhotoImage(file='image.gif')
    MyCustomWindow(root)
    root.mainloop()

if __name__ == "__main__":
    main()

或者，您可以完全放弃 main（）方法，使其全局自动：

Alternatively, you could drop your main() method entirely, making it global automatically:

class MyCustomWindow(Tkinter.Frame):
    # same as above

root = Tkinter.Tk()
image = Tkinter.PhotoImage(file='image.gif')
MyCustomWindow(root)
root.mainloop()

或者，在 __ init __ 方法中声明映像，但确保使用 self 关键字绑定到 Frame 对象，因此当 __ init __ finishes：

Or, declare the image in your __init__ method, but make sure to use the self keyword to bind it to your Frame object so it is not garbage collected when __init__ finishes:

class MyCustomWindow(Tkinter.Frame):
    def __init__(self, parent):
        Tkinter.Frame.__init__(self, parent)
        self.image = Tkinter.PhotoImage(file='image.gif')
        Tkinter.Label(self, image=self.image).pack()
        self.pack(side='top')

def main():
    # same as above, but without creating the image

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