python tkinter canvas 显示图片的示例


						先来看一下该方法的说明





create_image(position, **options) [#]

Draws an image on the canvas.



position

Image position, given as two coordinates.

**options

Image options.

activeimage=

anchor=

Where to place the image relative to the given position. Default is CENTER.

disabledimage=

image=

The image object. This should be a PhotoImage or BitmapImage, or a compatible object (such as the PIL PhotoImage). The application must keep a reference to the image object.

state=

Item state. One of NORMAL, DISABLED, or HIDDEN.

tags=

A tag to attach to this item, or a tuple containing multiple tags.

Returns:

The item id.





关于image有两个重要的点要注意，一个是格式，第二是要保持持续引用 

The image object. This should be a

1.This should be a PhotoImage or BitmapImage, or a compatible object (such as the PIL PhotoImage).

2.The application must keep a reference to the image object.

因此代码应该这样写，并且变量im应该是全局变量





image = Image.open("img.jpg") 

im = ImageTk.PhotoImage(image) 



canvas.create_image(300,50,image = im) 





但如果我就是想要在方法里调用怎么办？

那么可以提前声明全局变量





image = None

im = None



之后在方法里使用global来声明变量为全局变量

即：





def method():

  global image

  global im

  image = Image.open("img.jpg") 

  im = ImageTk.PhotoImage(image) 

  ...



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