Re: Need Help with Obj-C -> Java bridge method calls with multiple arguments
Re: Need Help with Obj-C -> Java bridge method calls with multiple arguments
- Subject: Re: Need Help with Obj-C -> Java bridge method calls with multiple arguments
- From: James Montgomerie <email@hidden>
- Date: Thu, 29 May 2003 16:48:54 -0700
On Thursday, May 29, 2003, at 4:30 PM, Marc Liyanage wrote:
Hi there,
On Mittwoch, Mai 28, 2003, at 04:32 Uhr, James Montgomerie wrote:
No-one's replied, so even though It's been a while since I used any
of this, and I'm replying from memory, hopefully this'll be helpful:
Thanks a lot...
I think you need "[transformer transform:streamSourceXml
:streamResult]" (note the space). Arguments past the first one have
no name, and if you provide one, it won't work (despite what the docs
say).
Seems I already used that form in my second example, and seems this,
along with the bug in the Apple docs, was mentioned in that article I
referenced. The author already told me about it...
Good - your second example had no whitespace before the second colon
though, hence my comment (perhaps this is not needed?)
If you still get null pointer exceptions, it's probable that you've
got errors in your code.
I thought so too at first, but maybe it's a problem in the Xalan Java
library I used: I left my code untouched but switched the library from
Xalan to Saxon, another XSLT processor, and my code worked immediately
and flawlessly...
Remember that on the Obj-C side of the bridge, normal Cocoa
reference counting rules apply to Java objects. The Java garbage
collector doesn't know what you're doing, so if you don't retain what
you need it will be garbage-collected away on the Java side.
Yes, but I used the alloc/init and the newWithSignature forms to
create new instances, and I think these all start with a ref count of
1, so I don't think that was the problem.
It was the "id transformer = [transformerFactory
newTransformer:streamSourceXslt];" line that was freaking me out - you
weren't retaining the returned transformer (though I don't know that
API, so maybe you don't need to because there's a reference to it
somewhere else).
Thanks for the confirmation about the method call syntax :-)
Well, I'm glad at least something was useful :-)
Jamie.
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