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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 discriminator: Check graphics-stream lifetime for the target channel/resource. This status means an open was attempted while the stream is already open, not that the stream cannot be obtained at all.
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