Hi,
I've been playing around with PyObjC (the default version that ships with
Leopard) but have hit a bit of a dead end. Does anyone know of a good guide
to PyObjC that's aimed at experienced Python coders? I've found plenty of
guides that are just step-by-step tutorials for building Cocoa applications,
but these are far too simplistic to be of any use. What I'm after is
something that explains how different types of method are called, the
underlying Python structure of ObjC objects and *exactly* how/where PyObjC
objects differ from vanilla Python objects.
Obviously the differences occur because Objective C uses a different OO idiom
to Python and so the bridged APIs don't 'fit' as well as ones written in
(say) C++ would. However all the examples and tutorials I've been through get
bogged down in "implement trivial application X" details and never go in to
enough depth about *how* Python is wrapping the underlying objects.
Specifically, I'm looking for documentation that can help me understand
features like class method support.
Take IOBluetooth.IOBluetoothDeviceInquiry for example. The documentation in
XCode states that this class has a factory method inquiryWithDelegate, which
you would use in Objective C as ...
SomeDelegate * delegate;
// ... instantiate delegate ...
IOBluetoothDeviceInquiry * inquiry;
inquiry = [IOBluetoothDeviceInquiry inquiryWithDelegate: delegate];
// ... handle null ...
IOReturn retVal = [inquiry start];
Now in Python I'd expect that would translate to ...
// ... import IOBluetooth bundle ...
delegate = new SomeDelegate ( )
inquiry = IOBluetooth.IOBluetoothDeviceInquiry.inquiryWithDelegate_ \
( delegate )
retVal = inquiry.start ( )
However there seems to be no sign of the class method. Instance methods are
still present (e.g. initWithDelegate_) but not the class ones. Obviously they
are there somewhere, but I've yet to find them and am somewhat frustrated
that the tutorials I've found don't seem to cover the area (once I've figured
it out I'll have to write my own :).
Any pointers towards documentation would be greatly appreciated,
vrai.
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