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UCEERR_GRAPHICSSTREAMALREADYOPEN
UCEERR_GRAPHICSSTREAMALREADYOPEN is a Windows User Composition Engine (UCE) HRESULT. It indicates that code attempted to open or initialize a graphics stream that is already active.
What to check for UCEERR_GRAPHICSSTREAMALREADYOPEN
- Ensure that stream initialization is performed once per owning channel or rendering lifecycle.
- Check reentrant callbacks and concurrent setup paths that can perform duplicate initialization.
- Pair stream close or teardown with its successful open operation before starting a new session.
Microsoft guidance for WPF render-thread failures
Diagnostic interpretation
This result has the HRESULT value 0x88980420. AllStat records the condition as “it”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the uceerr / graphicsstreamalreadyopen operation.
- check the documented return contract of the specific API because the same HRESULT can require different recovery in different interfaces.
Retry and recovery
Retry this result only when the owning API documents a transient state or after the condition described as “it” has changed.
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