[Bug 56598] New: Calling [vararg] method via ITypeLib without arguments via IDispatch fails

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WineHQ Bugzilla

25 Apr 2024 25 Apr '24

11:28 a.m.

https://bugs.winehq.org/show_bug.cgi?id=56598

Bug ID: 56598 Summary: Calling [vararg] method via ITypeLib without arguments via IDispatch fails Product: Wine Version: 9.6 Hardware: x86-64 OS: Linux Status: UNCONFIRMED Severity: blocker Priority: P2 Component: oleaut32 Assignee: wine-bugs@winehq.org Reporter: pontus@netler.se Distribution: ---

Our COM-interface expose a method that take 0-N opptional parameters via [vararg].

[vararg] HRESULT Test([in] VARIANT mandatory, [in] SAFEARRAY(VARIANT) optional, [out, retval] VARIANT* result);

Calling this method result in error when no arguments are specified, which breaks compatibility with native Windows.

Calling with arguments works.

Problem may relate to SafeArrayCreate not supporting empty arrays in Wine. Or to missing handling for edge-case in typelib.c (arround line 7363).

To progress testing we added workaround for our API, but this will affect compatibility in other areas.

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WineHQ Bugzilla

25 Apr 25 Apr

12:30 p.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

--- Comment #1 from Alexandre Julliard julliard@winehq.org --- Would you happen to have a small test case demonstrating the problem?

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WineHQ Bugzilla

1:39 p.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

--- Comment #2 from Pontus Netler pontus@netler.se --- Unfortunately no small and easy, did the investigation in our main product where I'm head developer...

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WineHQ Bugzilla

27 Apr 27 Apr

2:08 a.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

Ken Sharp imwellcushtymelike@gmail.com changed:

What |Removed |Added ---------------------------------------------------------------------------- Severity|blocker |normal

--- Comment #3 from Pontus Netler pontus@netler.se --- Created attachment 76363 --> https://bugs.winehq.org/attachment.cgi?id=76363 Simplistic ATL-project for reproducing the bug

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WineHQ Bugzilla

2:09 a.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

--- Comment #4 from Pontus Netler pontus@netler.se --- Created attachment 76364 --> https://bugs.winehq.org/attachment.cgi?id=76364 Compiled 32-bit EXE to reproduce the bug

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WineHQ Bugzilla

2:10 a.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

--- Comment #5 from Pontus Netler pontus@netler.se --- (In reply to Alexandre Julliard from comment #1)

...

Would you happen to have a small test case demonstrating the problem?

Now I've uploaded simplistic project and EXE to reproduce issue.

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WineHQ Bugzilla

2:11 a.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

Pontus Netler pontus@netler.se changed:

What |Removed |Added ---------------------------------------------------------------------------- CC| |pontus@netler.se

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WineHQ Bugzilla

8:09 a.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

Austin English austinenglish@gmail.com changed:

What |Removed |Added ---------------------------------------------------------------------------- Keywords| |download, source, testcase

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WineHQ Bugzilla

28 Apr 28 Apr

8:09 p.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

--- Comment #6 from Alexandre Julliard julliard@winehq.org --- Created attachment 76372 --> https://bugs.winehq.org/attachment.cgi?id=76372 vararg fix

Thank you for the test case, that's very helpful! The attached patch will hopefully fix it.

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WineHQ Bugzilla

1 May 1 May

5:16 p.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

Alex Henrie alexhenrie24@gmail.com changed:

--- Comment #7 from Alex Henrie alexhenrie24@gmail.com --- Fixed by https://gitlab.winehq.org/wine/wine/-/commit/fbba581cf2aeeda169f6cc229c1a80d...

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WineHQ Bugzilla

3 May 3 May

7:53 p.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

Alexandre Julliard julliard@winehq.org changed:

What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |CLOSED

--- Comment #8 from Alexandre Julliard julliard@winehq.org --- Closing bugs fixed in 9.8.

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WineHQ Bugzilla

18 Nov 18 Nov

10:49 p.m.

New subject: [Bug 56598] Calling [vararg] method via ITypeLib without arguments via IDispatch fails

https://bugs.winehq.org/show_bug.cgi?id=56598

Michael Stefaniuc mstefani@winehq.org changed:

What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |9.0.x

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WineHQ Bugzilla