Re: [Pyobjc-dev] using objc.inject
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Re: [Pyobjc-dev] using objc.inject
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From: Ronald O. <ron...@ma...> - 2009-08-11 14:42:53
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On 11 Aug, 2009, at 13:43, James R Eagan wrote:
> Hi Dan,
>
> I actually use objc.inject for a few projects, and it's a great
> debugging tool. I believe that your problem looks more like a bug
> in the InjectInterpreter code rather than in the lower-level
> objc.inject code (which works great!). In particular, try changing
> line 365 of InjectInterpreterPlugin.py from NSAnyEventMask to
> NSUIntegerMax.
Objc.inject will go away in PyObjC 2.2. There are two reasons for that
(as noted a while back):
1) objc.inject does not support 64-bit targets, and I don't have the
time or inclination to try to add that support. Adding this requires
low-level ABI hackery.
2) objc.inject doesn't really belong in PyObjC anyway, its
functionality is orthogonal to the rest of PyObjC.
>
> Logically, the use of NSAnyEventMask is correct in the above code.
> On the PyObjC side, however, it's a signed integer (at least in the
> PyObjC that comes with Leopard) instead of an unsigned integer.
> That's why NSUIntegerMax is functionally correct (even if logically
> incorrect) here. As for why NSAnyEventMask is signed instead of
> unsigned, that might be a bug in PyObjC. Maybe.
>
> >>> NSUIntegerMax
> 4294967295L
> >>> NSAnyEventMask
> -1
> >>> struct.unpack('L', struct.pack('l', NSAnyEventMask))[0] # cast
> to unsigned
> 4294967295L
Cocoa's header files are terribly confused about the semantics of
'enum' values. In particular, AFAIK the C standard says that enum's
are basicly an alias for 'int' while the Cocoa header files assume
that you can define unsigned or "long long" constants using enum
definitions, e.g.:
enum {
NSAnyEventMask = 0xffffffffU
};
The Cocoa headers seem to assume that 'NSAnyEventMask' is an unsigned
value, while in reality this is a signed value as can be seen by
compiling a test program like this:
/* printtype.m */
#include <stdio.h>
#import <Cocoa/Cocoa.h>
int main(void)
{
printf("typestr: %s\n", @encode(__typeof__(NSAnyEventMask)));
return 0;
}
/* EOF */
Luckily PyObjC knows about this problem and should automaticly do the
right thing here, that is: it will automaticly perform the cast to
unsigned where needed.
Ronald
>
> Cheers!
> James
>
> Le 29 juil. 09 à 18:18, Daniel Ashbrook a écrit :
>
>> Re: "does anyone use objc.inject" from a few months ago, I think I
>> would like to. I'm hoping to get at the internals of a program and
>> extract some hard-to-get-at information. However, trying the
>> InjectInterpreter example code doesn't seem to work, so any hints
>> would be appreciated. Doing:
>>
>> sudo python test.py 71755
>>
>> (where 7155 is the pid of TextEdit) returns without comment, but
>> prints to the system log:
>>
>> TextEdit[71755]: InjectInterpreterPlugin has encountered a fatal
>> error, and will now terminate.
>> TextEdit[71755]: An uncaught exception was raised during execution of
>> the main script:^M^MSystemError: NULL result without error in
>> PyObject_Call^M^MThis may mean that an unexpected error has occurred,
>> or that you do not have all of the dependencies for this bundle.
>> [0x0-0x48d48d].com.apple.TextEdit[71755]: Traceback (most recent call
>> last):
>> [0x0-0x48d48d].com.apple.TextEdit[71755]: File "/tmp/
>> InjectInterpreter/dist/InjectInterpreterPlugin.plugin/Contents/
>> Resources/__boot__.py", line 23, in <module>
>> [0x0-0x48d48d].com.apple.TextEdit[71755]:
>> _run('InjectInterpreterPlugin.py')
>> [0x0-0x48d48d].com.apple.TextEdit[71755]: File "/tmp/
>> InjectInterpreter/dist/InjectInterpreterPlugin.plugin/Contents/
>> Resources/__boot__.py", line 20, in _run
>> [0x0-0x48d48d].com.apple.TextEdit[71755]: execfile(path,
>> globals(), globals())
>> [0x0-0x48d48d].com.apple.TextEdit[71755]: File "/tmp/
>> InjectInterpreter/dist/InjectInterpreterPlugin.plugin/Contents/
>> Resources/InjectInterpreterPlugin.py", line 187, in <module>
>> [0x0-0x48d48d].com.apple.TextEdit[71755]: class
>> PyInterpreter(NSTextView):
>> [0x0-0x48d48d].com.apple.TextEdit[71755]: SystemError: NULL result
>> without error in PyObject_Call
>>
>> Any hints?
>>
>> Thanks,
>>
>>
>> dan
>>
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