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Limestudio90andClaude Opus 5.5 245015fd89 VST3 host: IMessage and IAttributeList for plugins (Helix loads its database)
`IHostApplication::createInstance` returned nothing, so plugins whose
controller and processor exchange `IMessage`s through
`IConnectionPoint::notify` could not create one. Line 6 Helix Stadium
Native reported "Failed to get content database recovery info (Out of
memory condition. [code -2])", loaded no models and exposed no
parameters.

The host now creates `IMessage` (an id plus its attribute list) and
`IAttributeList` (ints, floats, UTF-16 strings and binary blobs, by
NUL-terminated attribute id). Strings and blobs are kept in their own
allocation so pointers from `getBinary` stay valid while the list holds
the value; strings are capped at 1M UTF-16 units and blobs at 256 MiB.
Null arguments are refused rather than read. Other classes are still not
provided.

Verified with Helix Stadium Native 1.03.3a on Windows: the error is gone,
its model database and presets load, and its parameters appear in the
generic plugin window. A unit test drives the objects through the COM
interfaces the way a plugin does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-13 14:55:34 +02:00
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