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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
| Capture | Diagnostic value |
|---|---|
| Requested value and owning object for it. | This identifies the exact object or resource generation involved and helps test the Windows Animation Manager boundary. |
| Initialization path and default policy for it. | This places the failure on the lifecycle or transaction timeline and helps test the Windows Animation Manager boundary. |
| First read timestamp for it. | This separates caller input from environment and service state and helps test the Windows Animation Manager boundary. |
| Callback outputs preceding the read for it. | This provides a stable comparison across retries or another machine and helps test the Windows Animation Manager boundary. |
Subsystem meaning
During a this result investigation, Windows Animation is a stateful COM subsystem. Animation variables, transitions and storyboards are created under a manager, scheduled against a monotonic animation time, updated before drawing, and eventually sealed or released., a visible glitch can therefore be downstream of a lifecycle, ownership, timeline, callback, or numeric contract failure.
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.
The first owner to inspect is the animation manager, storyboard, transition, timer, or callback that returned the HRESULT.
Isolation workflow
When it is returned, use a disposable control object, repository copy, file, or device association where the subsystem permits it.
- 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
During a this result investigation, 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 input, fresh object or connection | If the result disappears, retained lifecycle or ownership state is implicated. | While diagnosing this result, keep the original data, account, device, or timeline parameters unchanged. |
| Same object, reduced operation | If the result follows one specific transition, statement, file, or ceremony step, the failure is localized. | While diagnosing it, remove only unrelated work and keep the first failing boundary visible. |
| Same operation, controlled environment | If the result follows one machine, account, volume, network, or device, environment matters. | While diagnosing it, 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
The references below define the API family or storage/protocol behavior used to interpret it.
- Microsoft: Windows Animation error codes
- Microsoft: Windows Animation overview
- Microsoft: Schedule a storyboard
- Microsoft: IUIAnimationManager interface
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