RE: Cocoa called from Carbon, objc_msgSend crash in 10.3.9.
RE: Cocoa called from Carbon, objc_msgSend crash in 10.3.9.
- Subject: RE: Cocoa called from Carbon, objc_msgSend crash in 10.3.9.
- From: "Matt Fox-Wilson" <email@hidden>
- Date: Tue, 19 Dec 2006 14:37:02 +1300
Thanks for the ideas there. Some more info:
The gCString class does implement a uint16* operator. I'm not entirely sure
why we don't have a UniChar operator but I didn't handle that side of
things.
I checked to see if we were calling NSApplicationLoad and it appears we
weren't, so I've added a call to that in our .mm file and I'm now calling it
from main() to see if that helps.
Originally, we didn't include the [pool release]; because, apparently, the
person who wrote the Cocoa call functions found some notes indicating that
it shouldn't be called. I can't confirm the location of those, and I'm
willing to try anything so we'll give it a shot. I'll build with those and
the NSApplicationLoad call and see if our user reports a fix.
Thanks for the rapid suggestions!
- Matt Fox-Wilson
- email@hidden
_____
From: John Stiles [mailto:email@hidden]
Sent: Tuesday, 19 December 2006 11:58 a.m.
To: David Duncan
Cc: Matt Fox-Wilson; email@hidden
Subject: Re: Cocoa called from Carbon, objc_msgSend crash in 10.3.9.
Even if there is a vtable, I suspect that this would technically work
because the vtable shows up at (Byte*)this - sizeof(void*).
I agree that it is skanky, though... unless his class implements an operator
uint16*, in which case it is fine. If the class doesn't already include this
operator, it should be added right away for safety.
On Dec 18, 2006, at 2:52 PM, David Duncan wrote:
On Dec 18, 2006, at 2:28 PM, Matt Fox-Wilson wrote:
gCString sResult = L"";
UniChar* sSource = (UniChar*)(uint16*)sRef;
This may not actually be a problem, but it is relying on the internal layout
of your class to function properly (I'm assuming sRef is another instance of
a gCString?). Unless the UniChar buffer is inline at the start of this class
and there are no virtual functions, this shouldn't work. All of that may
even be true, but I wouldn't rely on it and it would probably be very useful
to add a UniCharPtr() accessor to your class that just returns a UniChar* to
your characters.
if (sRef.Length() < 1) return sResult;
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSString * nsSrc = [NSString stringWithCharacters:sSource
length:sRef.Length()];
NSString* nsExt = [nsSrc lastPathComponent];
sResult.CopyString((CFStringRef)nsExt);
return sResult;
--
David Duncan
Apple DTS Quartz and Printing
email@hidden
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