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DWMERR_THEME_FAILED
DWMERR_THEME_FAILED identifies a failure in DWM theme and non-client processing. DWM could not apply or process theme-related data for the requested window operation.
Telemetry with explanatory value
| Record | Why it matters here |
|---|---|
| Active theme and high-contrast state | Recording active theme and high-contrast state separates the DWM theme and non-client processing boundary from a later wrapper symptom. |
| Window class, non-client attributes, and custom frame usage | Recording window class, non-client attributes, and custom frame usage ties the HRESULT to the DWM theme and non-client processing boundary rather than to the final visible failure. |
| Theme-change messages and DWM API result | Comparing theme-change messages and DWM API result shows whether this result follows input, object state, or environment. |
| Underlying UxTheme or Win32 error when available | Preserving underlying UxTheme or Win32 error when available provides the evidence needed to test this distinction: sTATE_TRANSITION_FAILED can occur with valid theme data during a lifecycle change; THEME_FAILED points to the theme-processing branch. |
Where the failure occurs
DWM combines composition with theme-dependent non-client rendering, colorization, and frame attributes. Custom frame code can coexist with themes only when it responds to theme and composition changes and uses supported resources. A theme failure is not proof that the client-area renderer or all composition is broken.
Theme resource lookup, non-client rendering, colorization, or theme transition.
Smallest faithful reproducer
Compare a standard top-level window under the default theme with the custom non-client path. Reapply documented attributes after theme-change notifications instead of replacing system theme files or caching private resources.
- Test with default system theme and a standard top-level window.
- remove custom non-client painting temporarily.
- Reapply attributes after WM_THEMECHANGED and composition changes.
- Validate theme resources through supported APIs.
Avoid broad resets
STATE_TRANSITION_FAILED can occur with valid theme data during a lifecycle change; THEME_FAILED points to the theme-processing branch. Do not replace system theme files or hard-code undocumented theme resources as a recovery step.
Separate object, input, and environment
| Test | Interpretation | Hold constant |
|---|---|---|
| Same environment, reduced input | If this result disappears with a smaller faithful case, complexity within DWM theme and non-client processing is implicated. | Keep active theme and high-contrast state fixed while simplifying theme-change messages and DWM API result. |
| Same input, fresh object instance | If it changes after rebuilding state, examine ownership across the caller’s HWND lifecycle, DWM attribute or transition request, theme layer, and compositor session. | Place window class, non-client attributes, and custom frame usage on the timeline of the last successful transition. |
| Same operation on a controlled second path | If it follows one environment, the failure is not explained by source data alone. | Compare desktop and session, composition state, active theme, window generation, and graphics event timeline while preserving underlying UxTheme or Win32 error when available. |
Completion test
A correction should let the operation at the DWM theme and non-client processing boundary complete repeatedly under the original supported conditions. Repeat the control that begins with “Test with default system theme and a standard top-level window” and confirm that the following lifecycle step also succeeds.
Technical references
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