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List:       ms-java-com
Subject:    How do I combine iid_is and size_is
From:       Herman Schipper <hschipper () BAAN ! NL>
Date:       2000-07-25 11:40:58
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I have the following method definition in idl:

HRESULT nextObjectsRemote(
[in] REFIID riid,                                               // requested
interface for objects
[in] ULONG celt,                                                // Number of
elements requested
[out,size_is(celt), iid_is(riid)] IUnknown **ppObjects, // the next objects
[out,retval] ULONG *pceltFetched                        // Pointer to the
number of objects actually supplied
);

I use the iid_is tag because I don't want to do a remote QI for every
retrieved object. I don't want to use the MULTI_QI structure because that
would give too much overhead.

Since midl and jactivex don't map these tags correclty to java, I would need
to write the following idl:
[out, size_is(celt), JTLBATTR_SIZE_IS("celt"), iid_is(riid),
JTLBATTR_IID_IS("riid")] IUnknown **ppObjects
but these two cannot be combined as far as I know, because:
The size_is tag would generate this in java:
@com.parameters([out,customMarshal="com.ms.com.SizeIsMarshaler",type=CUSTOM]
rgelt,
The iid_is tag would generate this in java:
@com.parameters([out,customMarshal="com.ms.com.IIDIsMarshaler",type=CUSTOM]
rgelt)
Since only one customMarshal class can be specified at a time it is not
possible to combine them automatically. Does anybody know if it is possible
to get the functionality I want?
I think that what I need is a class called
"com.ms.com.SizeIsAndIIDIsMarshaler", which would be a combination of the
marshalers above. Could I provide this myself, and if I did, would I just
write the 'non-java' idl and write the @com.parameters tags myself? Is there
a way to get to the sources of SizeIsMarshaler and IIDIsMarshaler?
TIA,
With kind regards,
Herman.

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