在Python中全屏显示图像

Question

下面的程序适用于目录中的第一个. jpg。当第二次调用时，它会得到一个“_tkinter。图片"pyImage2"不存在"异常。为什么它会得到错误？有没有办法重用第一个图像而不是创建第二个？

导入系统，如果是系统，则导入操作系统。版本信息[0]==2:
导入Tkinter Tkinter=Tkinter其他：从PIL导入图像，ImageTk导入Tkinter

def showPIL(pilImage):
    root = tkinter.Tk()
    w, h = root.winfo_screenwidth(), root.winfo_screenheight()
    root.overrideredirect(1)
    root.geometry("%dx%d+0+0" % (w, h))
    root.focus_set()
    root.bind("<Escape>", lambda e: (e.widget.withdraw(), e.widget.quit()))
    canvas = tkinter.Canvas(root,width=w,height=h)
    canvas.pack()
    canvas.configure(background='black')
    imgWidth, imgHeight = pilImage.size
 # resize photo to full screen 
    ratio = min(w/imgWidth, h/imgHeight)
    imgWidth = int(imgWidth*ratio)
    imgHeight = int(imgHeight*ratio)
    pilImage = pilImage.resize((imgWidth,imgHeight), Image.ANTIALIAS)   
    image = ImageTk.PhotoImage(pilImage)
    print(image)
    imagesprite = canvas.create_image(w/2,h/2,image=image)
    root.mainloop()

names = os.listdir("E://Users//scott//Pictures")
print(names)
for file in names:
    print(file)
    if file[-4:] == ".jpg":
        file=Image.open("E://Users//scott//Pictures//"+file)
        showPIL(file)

这是控制台输出。Traceback（最近一次调用）：文件"e：\用户\scott\Documents\Python\Imagetest.py"，第36行，在show PIL（file）文件"e：\用户\scott\Documents\Python\Imagetest.py"，第27行，在show PIL Imagesprite=canvas.create_image（w/2，h/2，图像=图像）文件"C：\Program Files\Python37\lib\tkinter__init__. py"，第2486行，create_image返回自身。_create（'Image'，args，kw）文件"C：\Program Files\Python37\lib\tkinter__init__. py"，第2477行，_create*（args自身._options（cnf， kw）））_tkinter。图片"pyImage2"不存在

Answer 1

在四处搜索之后，我发现第一个问题是tkinter。Tk（）被调用了多次，但必须只调用一次，因此我将其从showPIL函数中移出，并转移到初始化中。下一个问题是mainloop阻塞，所以我将其替换为root的组合。更新_idletasks（）和根目录。更新（）。以下工作符合我的预期和需要：

import sys, os
if sys.version_info[0] == 2:  # the tkinter library changed it's name from Python 2 to 3.
    import Tkinter
    tkinter = Tkinter #I decided to use a library reference to avoid potential naming conflicts with people's programs.
else:
    import tkinter
from PIL import Image, ImageTk
import time

root = tkinter.Tk()
w, h = root.winfo_screenwidth(), root.winfo_screenheight()
root.overrideredirect(1)
root.geometry("%dx%d+0+0" % (w, h))
root.focus_set()
canvas = tkinter.Canvas(root,width=w,height=h)
canvas.pack()
canvas.configure(background='black')


def showPIL(pilImage):
    imgWidth, imgHeight = pilImage.size
 # resize photo to full screen 
    ratio = min(w/imgWidth, h/imgHeight)
    imgWidth = int(imgWidth*ratio)
    imgHeight = int(imgHeight*ratio)
    pilImage = pilImage.resize((imgWidth,imgHeight), Image.ANTIALIAS)   
    image = ImageTk.PhotoImage(pilImage)
    imagesprite = canvas.create_image(w/2,h/2,image=image)
    root.update_idletasks()
    root.update()
#    root.bind("<Escape>", lambda e: (e.widget.withdraw(), e.widget.quit()))


names = os.listdir("E://Users//scott//Pictures")
print(names)
for file in names:

    print(file)
    if file[-4:] == ".jpg":
        file=Image.open("E://Users//scott//Pictures//"+file)
        showPIL(file)

        time.sleep(5)