在Python3中Pickle GdkPixbuf.Pixbuf对象

Question

我想在Python3中对一个GdkPixbuf.Pixbuf进行酸洗和解酸。更具体地说，Python3的multiprocessing包需要这样做，因为我通过Queue在进程之间共享这些对象。

问题是对象从

<GdkPixbuf.Pixbuf object at 0x7f8b9e9cfb88 (GdkPixbuf at 0x563b61725c60)>

至

<GdkPixbuf.Pixbuf object at 0x7f8b9e9eaea0 (uninitialized at 0x(nil))>

这是最小的工作示例。

>>> import gi
>>> from gi.repository import GdkPixbuf
__main__:1: PyGIWarning: GdkPixbuf was imported without specifying a version first. Use gi.require_version('GdkPixbuf', '2.0') before import to ensure that the right version gets loaded.

>>> pf = GdkPixbuf.Pixbuf.new_from_file('_icon.png')
>>> pf
<GdkPixbuf.Pixbuf object at 0x7f8b9e9cfb88 (GdkPixbuf at 0x563b61725c60)>

>>> import pickle
>>> pickle.dump(pf, open('p', 'wb'))

>>> pb2 = pickle.load(open('p', 'rb'))
>>> pb2
<GdkPixbuf.Pixbuf object at 0x7f8b9e9eaea0 (uninitialized at 0x(nil))>

我找不到其他的泡菜方法。需要将图标加载到单独的进程中(在不同的CPU核心上，而不是应用程序的主/第一进程)，然后应将其传输到主进程。这是通过一个Queue来完成的，它会对所有数据进行筛选。

Answer 1

我的解决方案是将“图标”不作为Pixbuf对象保存在内存中，而是作为我从文件中读取的原始字节。

在解开这些字节之后，我将它们转换成一个Pixbuf。

>>> import gi
>>> from gi.repository import GdkPixbuf, Gio, GLib
__main__:1: PyGIWarning: GdkPixbuf was imported without specifying a version first. Use gi.require_version('GdkPixbuf', '2.0') before import to ensure that the right version gets loaded.
>>> with open('_icon.png', 'rb') as f:
...     icon_bytes = f.read()
... 
>>> 
>>> import pickle
>>> pickle.dump(icon_bytes, open('p', 'wb'))
>>> 
>>> pb = pickle.load(open('p', 'rb'))
>>> pb = GLib.Bytes(pb)
>>> pb = GdkPixbuf.Pixbuf.new_from_stream(Gio.MemoryInputStream.new_from_bytes(pb))
>>> pb
<GdkPixbuf.Pixbuf object at 0x7fc0858ac5e8 (GdkPixbuf at 0x55e0d8d08b60)>