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如何在另一种方法中将所选图像的路径显示为变量?

filechooser kivy return python

-1

Berch · 技术社区 · 6 年前

我有两个方法,get_image_one()打开Tkinter文件选择器并返回一个显示在kv文件中的图像。我希望将所选图像设置为check_for_image()方法中的源,以便可以通过check_for_image()对所选图像进行进一步处理,例如检查用户所选图像是否有任何文本等。此测试的逻辑将由check_for_image()提供

请告诉我这是否是最好的方法,即有两个独立的方法,一个用于选择文件,另一个用于验证文件。谢谢你的时间和关注。

下面是我的完整例子。

Me.Py

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.core.window import Window
from kivy.uix.popup import Popup
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty

from tkinter.filedialog import askopenfilename
from tkinter import Tk

class SampBoxLayout(BoxLayout):

    def get_image_one(self):
        '''This method is called by button FileChooser, it opens a FileChooser selects the desired image'''
        Tk().withdraw()
        img1 = askopenfilename(initialdir = "/",title = "Select file",filetypes = (("jpeg files","*.jpg"),("all files","*.*")))
        self.first_image.source = img1

    def check_for_image(self):
        '''This method is called by button TextIdentifier
           1. It needs to get the image selected by the above FileChooser
           2. The selected Image can be analysed further Ex: to check the if the selected image contains any text etc.
        '''
        pass

class SampleApp(App):
    def build(self):
        # Set the background color for the window
        Window.clearcolor = (1, 1, 1, 1)
        return SampBoxLayout()

sample_app = SampleApp()
sample_app.run()

样品千伏

#:kivy 1.10.0
<ColoredBackground@Image>:
    font_size: '48sp'
    color: (.9, .5, .4, 1)
    canvas.before:
        Color:
            rgb: (.2, .9, .9)
        Rectangle:
            pos: self.x + sp(2), self.y + sp(2)
            size: self.width - sp(5), self.height - sp(4)

<SampBoxLayout>:
    first_image: first_image     # <----
    orientation: "vertical"
    padding: 10
    spacing: 10

    # ---------- Button FileChooser ----------
    BoxLayout:
        orientation: "horizontal"
        height: 30

        Button:
            text: "FileChooser"
            on_press: root.get_image_one()
        Button:
            text: "TextIdentifier"
            on_press: root.check_for_image()

    # ---------- Display Images----------
    BoxLayout:
        orientation: "vertical"
        height: 30

        ColoredBackground:
            id: first_image  # <----
            size: self.parent.width, self.parent.height
            allow_stretch: True
            keep_ratio: False

1 回复 | 直到 6 年前

ikolim 6 年前

解决方案

替换 img1 具有 self.img1 用于在其他方法中访问图像。
在 get_image_one() 方法,当前未选择任何内容时Kivy应用程序崩溃。因此,检查用户是否选择了任何图像。如果没有选择,该怎么办?例如,显示弹出消息。
在 check_for_image() 方法,如果所有检查都通过,则将图像文件分配给图像的源。

建议

如果有很多支票,就把它分开。始终保持模块小,便于理解和维护。

片段

class SampBoxLayout(BoxLayout):

    def get_image_one(self):
        '''This method is called by button FileChooser, it opens a FileChooser selects the desired image'''
        Tk().withdraw()     # we don't want a full GUI, so keep the root window from appearing
        self.img1 = askopenfilename(initialdir="/", title="Select file",
                                    filetypes=(("jpeg files", "*.jpg"), ("all files", "*.*")))
        if not self.img1:
            # TODO
            # e.g. Kivy Popup message
            print("No image file selected!")

    def check_for_image(self):
        '''This method is called by button TextIdentifier
           1. It needs to get the image selected by the above FileChooser
           2. The selected Image can be analysed further Ex: to check the if the selected image contains any text etc.
        '''
        print(self.img1)
        self.first_image.source = self.img1
        self.first_image.reload()

如何在另一种方法中将所选图像的路径显示为变量?

解决方案

建议

片段

输出