Re: [Pyobjc-dev] pickled Objective-C objects

[Just v. R. <ju...@le...>]

I managed to add pickle support to (as a test) NSBezierPath by adding a
__reduce__ method to a __subclass__. I'm now trying to figure out how to
add __reduce__ to all objects, and was hoping to add it to
objc._convenience, but I'm stuck. Here's what I have so far:


def _unpickleNSObject(data):
    from Foundation import NSUnarchiver, NSData
    return NSUnarchiver.unarchiveObjectWithData_(
        NSData.dataWithBytes_length_(data, len(data)))

def __reduce__NSObject(obj):
    from Foundation import NSArchiver
    return _unpickleNSObject, (str(
        NSArchiver.archivedDataWithRootObject_(self).bytes()),)

# XXX now add __reduce__NSObject as __reduce__ to all objects

Hm, it seems this would work:

NSObject.__reduce__ = __reduce__NSObject

Is objc._convenience the right place for this? I guess not since it
currently doesn't even import Foundation.

Just

PS: It seems NSData doesn't support the buffer protocol; you can't pass
a string where an NSData is expected, and str(anNSDataInstance) doesn't
do the right thing.