Class Info doesn't seem to be working for me... I'd like some help.
I'm writing a C++ class, called "Object", which implements two
interfaces, iObject and iQueryResult, in addition to nsIClassInfo and
nsISupports. (Yes, I know that those are somewhat lousy names).
My IDL files contain:
[scriptable, uuid(78de02d5-e650-4343-a263-0e4a6d6d47ae)]
interface iQueryResult : nsISupports
{
const unsigned short QR_IOBJECT = 0;
const unsigned short QR_IFIELD = 1;
const unsigned short QR_QUERYRESULTSET = 2;
readonly attribute unsigned short queryResultType;
};
[scriptable, uuid(8d2b6b37-997e-49b7-9f3d-c68923057c4a)]
interface iObject: iQueryResult
{
...
}
My Object.h contains:
class Object : public iObject
{
...
NS_DECL_ISUPPORTS
NS_DECL_IOBJECT
NS_DECL_IQUERYRESULT
...
}
My Object.cpp contains
NS_IMPL_ISUPPORTS2_CI(Object, iObject, iQueryResult)
My XPCOMModules.cpp contains
NS_GENERIC_FACTORY_CONSTRUCTOR(Object)
NS_DECL_CLASSINFO(Object)
static nsModuleComponentInfo components[] =
{
{
"Object Class",
OBJECT_CID,
OBJECT_CONTRACT_ID,
ObjectConstructor,
nsnull,
nsnull,
nsnull,
NS_CI_INTERFACE_GETTER_NAME(Object),
nsnull,
&NS_CLASSINFO_NAME(Object)
},
...
}
NS_IMPL_NSGETMODULE(myModule, components)
My xulunit test case is:
function test_iObject_classinfo {
...
alert(object);
var info =
object.QueryInterface(Components.interfaces.nsIClassInfo);
...
}
The alert says object is an [xpconnect wrapped iObject @ .... ] which
is what I expect.
However, the test crashes on the next line with an NS_NOINTERFACE
error.
It appears that Javascript does not believe that the object supports
nsIClassInfo. According to the docs I found online at
http://www.mozilla.org/projects/xpcom/nsIClassInfo.html this should be
enough to get classinfo stuff working. The code at
http://lxr.mozilla.org/mozilla1.8.0/source/xpcom/sample/nsSampleModule.cpp
looks similar with nothing obviously out of place.
Clearly, I'm missing something. Can anyone help me out?
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