wxPython 获取远程图像和线程

Question

我正在尝试在 wxPython 中编写一个应用程序来显示亚马逊商店的一些商品（目前只有 JPG 格式的书籍封面）。我正在使用 urllib2 并将它们显示在位图按钮上并列出它们以供进一步操作，但是在编码之后，主 window/app 似乎只在所有 urls/images 都被获取之后才加载..谷歌搜索我明白我们必须在应用程序主代码运行时使用线程来中断操作，但这是我第一次尝试使用 wxpython，我读过的所有示例让我更加困惑。

我在下面提到了我正在与任何专家合作的代码，他们可以给我一些关于如何确保每个 URL 在读取它们时被获取和显示的想法......下面的代码是一个合并在这里和网络上找到了各种例子，所以请原谅我缺乏技能..

import wx
import os
import sys
import urllib2
import cStringIO

urls = ['https://images-na.ssl-images-amazon.com/images/I/51-u3J3mtTL._AC_US100_.jpg',
        'https://images-na.ssl-images-amazon.com/images/I/51cRqX8DTgL._AC_US100_.jpg',
        'https://images-na.ssl-images-amazon.com/images/I/515iBchIIzL._AC_US100_.jpg',
        'https://images-na.ssl-images-amazon.com/images/I/511MaP7GeJL._AC_US100_.jpg',
        'https://images-na.ssl-images-amazon.com/images/I/51jizRmRYYL._AC_US160_.jpg']

class Example(wx.Frame):

    def __init__(self, *args, **kwargs):
        super(Example, self).__init__(*args, **kwargs) 
        self.InitUI()
        self.Ctrls()
        self.makeButtons()

    def makeButtons(self):

        i = 0

        for url in urls:

            f = urllib2.urlopen(url)
            data = f.read()

            i += 1
            print " url = ",url, "  ",i
            stream = cStringIO.StringIO(data)
            bmp = wx.BitmapFromImage( wx.ImageFromStream( stream ) )
            button = wx.Button(self.panel, -1, "Book cover", style=wx.ALIGN_CENTER, size=wx.Size(100,100))
            button.SetToolTipString("wx.Button can how have an icon on the left, right,\n"
                           "above or below the label.")
            button.SetBitmap(bmp,
                    wx.LEFT    # Left is the default, the image can be on the other sides too
                    #wx.RIGHT
                    #wx.TOP
                    #wx.BOTTOM
                    )
            button.SetBitmapMargins((4,4)) 
            button.SetFont(wx.Font(8, wx.SWISS, wx.NORMAL, wx.BOLD, False))
            self.wrapSizer.Add(button, 1, wx.EXPAND)
        self.Show(True)
        self.panel.Layout()

    def InitUI(self):
        self.SetSize((800, 400))
        self.SetTitle('Dynamically Flow Buttons to Next Row on Window-Resize')
        self.Centre()


    def Sizers(self):
        self.wrapSizer = wx.WrapSizer()
        self.panel.SetSizer(self.wrapSizer)

    def Ctrls(self):
        self.panel = wx.Panel(parent=self,pos=wx.Point(0,0), size=wx.Size(750,550), style=wx.TAB_TRAVERSAL)
        self.Sizers()

def main():

    ex = wx.App()
    Example(None)
    ex.MainLoop()

if __name__ == '__main__':
    main()

Answer 1

您应该使用线程进行 url 获取，然后使用 wx.CallAfter 到 return 到主线程来显示数据...这里是如何更改您的代码

import threading

def makeButtons(self):


    def _update_data(data):

        stream = cStringIO.StringIO(data)
        bmp = wx.BitmapFromImage( wx.ImageFromStream( stream ) )
        button = wx.Button(self.panel, -1, "Book cover", style=wx.ALIGN_CENTER, size=wx.Size(100,100))
        button.SetToolTipString("wx.Button can how have an icon on the left, right,\n"
                       "above or below the label.")
        button.SetBitmap(bmp,
                wx.LEFT    # Left is the default, the image can be on the other sides too
                #wx.RIGHT
                #wx.TOP
                #wx.BOTTOM
                )
        button.SetBitmapMargins((4,4)) 
        button.SetFont(wx.Font(8, wx.SWISS, wx.NORMAL, wx.BOLD, False))
        self.wrapSizer.Add(button, 1, wx.EXPAND)
        self.Show(True)
        self.panel.Layout()

    def f():
        f = urllib2.urlopen(url)
        data = f.read()
        wx.CallAfter(_update_data, data)

    for url in urls:
        threading.Thread(target=f).start()

wxPython 获取远程图像和线程

wxPython fetch remote image and threading

python

wxpython

urllib2

python-multithreading