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NS_E_WMP_UI_PASSTHROUGH
Meaning at the producing boundary
Windows Media Player reports NS_E_WMP_UI_PASSTHROUGH (0xC00D0FE4) when the skin hit-test path returned its internal pass-through result rather than selecting a control. The UI pass through condition is owned by the XML-based skin loader that opens a skin package, finds its.wms definition, constructs views and controls, applies attributes and attaches event handlers to artwork-backed UI elements.
The generated part of the What Is page already shows the standard AllStat description for this HRESULT. The additional test for the UI pass through condition is to record pointer coordinates, view, z-order and the control whose hit-test delegated to content below it; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
Investigation order
- Find the first component that returned this result and label that event as the UI pass through boundary.
- Freeze the input and object identity associated with UI pass through before WMP fallback or cleanup changes it.
- Reconstruct the immediately preceding successful state for UI pass through, then identify the call or event that crossed into failure.
- Perform the code-specific test: record pointer coordinates, view, z-order and the control whose hit-test delegated to content below it.
- Make the narrow correction—handle the pass-through result as control flow unless an outer caller incorrectly promotes it to failure—and repeat the same producing operation for UI pass through.
The surrounding WMP state
For the UI pass through condition, a skin package combines an XML definition with image and script resources; archive validity, schema validity and runtime object construction are separate checkpoints. The second constraint for UI pass through is that control properties such as image dimensions, minimum/maximum values and child-element support are evaluated after basic XML parsing succeeds.
Inputs that distinguish the causes
Preserve the first occurrence before retry or fallback changes the UI pass through evidence. The following fields should identify the same object generation:
| Field | What to record |
|---|---|
| Decisive check | record pointer coordinates, view, z-order and the control whose hit-test delegated to content below it |
| Artifact identity | control type, object ID and parent/child relation for the UI pass through reproduction |
| Runtime state | resource path, decoded dimensions and transparency/mapping attributes for the UI pass through reproduction |
| Owning object | event name, first handler and any duplicate handler declaration for the UI pass through reproduction |
| Lower-level result | skin archive path, member list and selected.wms definition for the UI pass through reproduction |
| Correlation | THEME/version declaration and currentViewID for the UI pass through reproduction |
Do not confuse it with nearby results
| Result | Different boundary |
|---|---|
NS_E_WMP_UI_OBJECTNOTFOUND | attributes were parsed for a skin object that was never constructed |
NS_E_WMP_UI_VIEWIDNOTFOUND | currentViewID names a view that is not defined in the skin file |
NS_E_WMP_UI_SECONDHANDLER | a second handler is declared for an event that already has one |
Verification after correction
What a real fix must change
- Avoid renaming arbitrary XML to.wms or repacking a skin without preserving its relative resource paths while investigating UI pass through; it can destroy the artifact or state needed to explain it.
- Avoid editing several controls at once before identifying the first schema or construction failure; for UI pass through, that can replace the original HRESULT with a secondary failure from another layer.
Code-specific operational note
Technical references
- Windows Media Player skins — normative or platform material relevant to it.
- Skin definition file structure — API or format context for this HRESULT.
- Skin definition XML structure — documentation used to identify the producing boundary of it.
- Skin files and package contents — normative or platform material relevant to it.
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