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UI_E_VALUE_NOT_SET
Within Windows Animation Manager, UI_E_VALUE_NOT_SET reports that the caller requested an animation value that has never been assigned. Diagnosis of this result should follow the original owner and generation rather than treating the visible symptom as the cause.
Facts that change the diagnosis
- Requested value and owning object.
- Initialization path and default policy.
- First read timestamp.
- Callback outputs preceding the read.
Subsystem meaning
This is an absence-of-state result. It commonly exposes a read-before-initialization path in a callback, variable, or custom interpolator rather than a numeric calculation failure.
Isolation workflow
- First: Initialize the value on every construction path.
- Next: Check optional-state presence before reading it.
- Then: Exercise the path that omits the setter deliberately.
- Finally: Verify reset and reuse do not clear required state unexpectedly.
Avoid the tempting broad fix
UI_E_VALUE_NOT_DETERMINED means evaluation cannot currently derive a value; NOT_SET means no value was supplied.
Do not invent zero as a universal default unless zero is part of the documented contract.
Expected branches
| Control | Interpretation | Hold constant |
|---|---|---|
| Same operation, controlled environment | If the result follows one machine, account, volume, network, or device, environment matters. | Keep versions and identity explicit rather than comparing only the final message. |
Regression proof
Verify it with the original scenario, one boundary case, and one deliberate failure; success means both initialized and intentionally absent cases produce explicit, tested outcomes without an implicit default.
Technical references
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