Question

我正在研究一个使用Tkinter和ImageTk显示一系列图像的python程序。我无法显示多个图像。下面是一个重现错误的小型完整程序。程序直接递归搜索当前的jpg文件，并在用户按Enter键时显示它们。

import Tkinter, ImageTk,os, re


def ls_rec(direc):
    try:
        ls = os.listdir(direc)
    except Exception as e:
        return
    for f in os.listdir(direc):
        fpath = os.path.join(direc, f)
        if os.path.isfile(fpath):
            yield fpath
        elif os.path.isdir(fpath):
            for f2 in iterate_dir(os.path.join(direc,f)):
                yield f2

images = filter(lambda a:re.match('.*\\.jpg$',a),ls_rec(os.getcwd()))
assert(len(images)>10)
top = Tkinter.Tk()
image_label = Tkinter.Label(top)
Label_text = Tkinter.Label(top,text="Below is an image")
img = None
i = 0



def get_next_image(event = None):
    global i, img
    i+=1
    img = ImageTk.PhotoImage(images[i])
    label.config(image=img)
    label.image = img

top.bind('<Enter>',get_next_image)
label.pack(side='bottom')
Label_text.pack(side='top')
get_next_image()
top.mainloop()

程序因以下追溯而失败：

Traceback (most recent call last):
  File "/usr/lib/python2.7/pdb.py", line 1314, in main
    pdb._runscript(mainpyfile)
  File "/usr/lib/python2.7/pdb.py", line 1233, in _runscript
    self.run(statement)
  File "/usr/lib/python2.7/bdb.py", line 387, in run
    exec cmd in globals, locals
  File "<string>", line 1, in <module>
  File "/home/myuser/Projects/sample_images.py", line 1, in <module>
    import Tkinter, ImageTk,os, re
  File "/home/myuser/Projects/sample_images.py", line 32, in get_next_image
    img = ImageTk.PhotoImage(some_image[1])
  File "/usr/lib/python2.7/dist-packages/PIL/ImageTk.py", line 109, in __init__
    mode = Image.getmodebase(mode)
  File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 245, in getmodebase
    return ImageMode.getmode(mode).basemode
  File "/usr/lib/python2.7/dist-packages/PIL/ImageMode.py", line 50, in getmode
    return _modes[mode]
KeyError: '/home/myuser/sampleimage.jpg'

运行此代码时是否有人获得相同的行为？我究竟做错了什么？

编辑：使用korylprince的解决方案，并进行一些清理，以下是原始代码的工作版本：

import os, re, Tkinter, ImageTk

def ls_rec(direc, filter_fun=lambda a:True):
    for (dirname, dirnames, fnames) in os.walk(direc):
        for fname in fnames:
            if filter_fun(fname):
                yield os.path.join(dirname,fname)


top = Tkinter.Tk()
image_label = Tkinter.Label(top)
text_label = Tkinter.Label(top,text="Below is an image")
images = ls_rec(os.getcwd(), lambda a:re.match('.*\\.jpg$',a))

imgL = []

def get_next_image(event = None):
    fname = images.next()
    print fname
    fhandle = open(fname)
    img = ImageTk.PhotoImage(file=fhandle)
    fhandle.close()
    imgL.append(img)
    image_label.config(image=img)


top.bind('<Return>',get_next_image)
image_label.pack(side='bottom')
text_label.pack(side='top')
get_next_image()
top.mainloop()

编辑：top.bind('<Enter>'...)实际上绑定了鼠标进入框架的事件，而不是用户按Enter键。正确的行是top.bind('<Return>',...)。

Answer 1

ImageTk.PhotoImage没有真正记录正确。

你应该尝试这样的事情：

#outside of functions
images = list()

#inside function
global images
with open(images[i]) as f:
    img = ImageTk.PhotoImage(file=f)
    images.append(img)

将图像放入列表的原因是python将引用它。否则垃圾收集器最终将删除图像对象。

使用Tkinter显示图像

1 个答案: