Today I wrote a patch for implementing nsIRegExpService (bug 106590),
and it occured to me that this would be a good example to write for my
XPCOM Cheat Sheet. (Not to mention for implementing the pattern
attribute for Web Forms 2.0.)
But later, I started thinking about how C++ code is going to access the
members of the returned array, and my head started spinning.
Then I ran into the nsIArray and nsIMutableArray interfaces, which look
somewhat simpler (I understand XPCOM somewhat better), but seem to
involve a bit more code.
I wandered around and gathered a few references on XPIDL-style arrays:
http://www.mozilla.org/scriptable/faq.html#i11
* http://lxr.mozilla.org/seamonkey/source/js/src/xpconnect/tests/
components/xpctest_array.cpp)
* http://lxr.mozilla.org/seamonkey/source/js/src/xpconnect/tests/js/old/
xpctest_array.js
http://weblogs.mozillazine.org/weirdal/archives/008213.html
* http://lxr.mozilla.org/seamonkey/source/xpfe/components/extensions/
src/nsExtensionManager.js
* http://lxr.mozilla.org/seamonkey/source/xpcom/components/nsIClassInfo.idl
http://lxr.mozilla.org/seamonkey/search?string=PRUnichar+***
I also gathered a few on nsIArray and nsIMutableArray:
http://developer.mozilla.org/en/docs/XPCOM:Arrays
* http://lxr.mozilla.org/seamonkey/source/xpcom/ds/nsIArray.idl
* http://lxr.mozilla.org/seamonkey/source/xpcom/ds/nsIMutableArray.idl
http://lxr.mozilla.org/seamonkey/source/toolkit/components/filepicker/
content/filepicker.js#554
http://lxr.mozilla.org/seamonkey/source/toolkit/components/passwordmgr/
base/nsPasswordManager.cpp#467
These two models are very different, and I must ask which I should use,
and when?
The answer to this question will matter a great deal to me, and affect
both the Cheat Sheet and future patches I submit for reviews and checkin
to mozilla.org trunk.
Alex Vincent
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