保存图像流，然后显示

Question

我最终想保存我的图片在数据库中，但现在一个文件就行了。

我已经开始用

with open("blue.png", "rb") as imageFile: 
     f = imageFile.read() 
     b = bytearray(f) 
    with open("blue.bytes", "w") as streamFile: 
     f = streamFile.write(str(b)) 

这让我看起来像一个文件：

bytearray(b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x0 ... 

这是正确的那么远？

我怎样随后读出来并转换为图像？ 我自认是绝望困惑我是否要字节或ByteArray并将如何得到这个字符串返回到该形式

我这里有我在尝试通过工作，但我知道这是行不通的

import wx 
from io import BytesIO 


class MainFrame(wx.Frame): 
    def __init__(self): 
     wx.Frame.__init__(self, None, -1, 'Demonstrate wxPython image') 
     self.panel = MainPanel(self) 
     self.Centre() 
     self.save_stream() 

    def save_stream(self): 
     bitmap = wx.Bitmap('blue.png', wx.BITMAP_TYPE_ANY) 
     with open("blue.png", "rb") as imageFile: 
      f = imageFile.read() 
      b = str(bytearray(f)) 
     with open("blue.bytes", "w") as streamFile: 
      f = streamFile.write(b) 


class MainPanel(wx.Panel): 
    def __init__(self, frame): 
     """Initialise the class.""" 
     wx.Panel.__init__(self, frame) 
     file_image_sizer = self._image_from_file() 
     stream_image_sizer = self._image_from_stream() 
     main_sizer = wx.BoxSizer(wx.HORIZONTAL) 
     main_sizer.Add(file_image_sizer, flag=wx.ALL, border=10) 
     main_sizer.Add(stream_image_sizer, flag=wx.ALL, border=10) 
     self.SetSizerAndFit(main_sizer) 

    def _image_from_file(self): 
     image_sizer = wx.BoxSizer(wx.VERTICAL) 
     bitmap = wx.Bitmap('red.png', wx.BITMAP_TYPE_ANY) 
     static_bitmap = wx.StaticBitmap(self, wx.ID_ANY, wx.NullBitmap) 
     static_bitmap.SetBitmap(bitmap) 
     image_sizer.Add(static_bitmap) 
     return image_sizer 

    def _image_from_stream(self): 
     image_sizer = wx.BoxSizer(wx.VERTICAL) 
     static_bitmap = wx.StaticBitmap(self, wx.ID_ANY, wx.NullBitmap) 
     with open("blue.bytes", "rb") as imageFile: 
      f = imageFile.read() 
     bitmap = wx.Bitmap(BytesIO(bytes(f)), wx.BITMAP_TYPE_ANY) 
     static_bitmap = wx.StaticBitmap(self, wx.ID_ANY, wx.NullBitmap) 
     static_bitmap.SetBitmap(bitmap) 
     image_sizer.Add(static_bitmap) 
     return image_sizer 


if __name__ == '__main__': 
    screen_app = wx.App() 
    main_frame = MainFrame() 
    main_frame.Show(True) 
    screen_app.MainLoop() 

继罗宾的答案，我已经改变了_image_from_stream功能如下：

def _image_from_stream(self): 
    image_sizer = wx.BoxSizer(wx.VERTICAL) 
    static_bitmap = wx.StaticBitmap(self, wx.ID_ANY, wx.NullBitmap) 
    with open("blue.bytes", "r") as imageFile: 
     image = wx.Image(imageFile) 
     bitmap = wx.Bitmap(image) 
    static_bitmap = wx.StaticBitmap(self, wx.ID_ANY, wx.NullBitmap) 
    static_bitmap.SetBitmap(bitmap) 
    image_sizer.Add(static_bitmap) 
    return image_sizer 

Answer 1

由于它是数据，而不是文本，然后你要保持它作为一个字节或ByteArray，不海峡。

在wxPython4可以从文件或类似文件的对象加载图像，并转换为位图（如果需要）是这样的：

image = wx.Image(file_object) 
bmp = wx.Bitmap(image)