PyGame加载cStringIO作为图像



所以,我在网上尝试了一些解决方案,但每个人都返回不同的错误。最近,我决定尝试这样做:

import cStringIO, pygame, os
from pygame.locals import *
pygame.init()
mainClock = pygame.time.Clock()
WINDOWWIDTH = 640
WINDOWHEIGHT = 480
windowSurface = pygame.display.set_mode((WINDOWWIDTH, WINDOWHEIGHT), 0, 32)
pygame.display.set_caption('StringIO Test')
with open("image.png", "rb") as infile:
    outfile = cStringIO.StringIO()
    outfile.write(infile.read())

class DummyFile:
    def __init__(self, data):
       self.data = data
        self.pos = 0
    def read(self, size=None):
        start = self.pos
        end = len(self.data) - 1
        if size is not None:
            end = min(len(self.data), self.pos + size)
        self.pos = end
        return self.data[start:end]
    def seek(self, offset, whence=0):
        if whence == 0:
            self.pos = offset
        elif whence == 1:
            self.pos = self.pos + offset
        elif whence == 2:
            self.pos = len(data) + offset    
    def write(self):
        pass
while True:
    windowSurface.fill((0,0,0))
    testIm = pygame.image.load(DummyFile(outfile.getvalue()))
    testImRect = testIm.get_rect()
    testImRect.topleft = (0,0)
    windowSurface.blit(testIm, testImRect)
    pygame.display.flip()

返回:

error: Can't seek in this data source

本质上,我的程序将加密/解密图像文件,并允许用户查看它们,而无需将解密副本保存到硬盘驱动器。在另一个问题中,我被告知stringIO对象可以用于此目的,如果您要广泛使用cStringIO,则python文档建议使用它。问题是pygame不想将对象作为图像。什么好主意吗?

添加到DummyFile

def tell(self):
    return self.pos

它认为你的类文件对象是不可搜索的,因为它缺少该方法。通过在DummyFile中添加__getattr__方法并查看调用了哪些方法来解决这个问题。

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