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VFW_E_NO_INTERFACE
Meaning
Windows documents VFW_E_NO_INTERFACE as “A required interface has not been implemented”. In practical terms, it is returned when a DirectShow operation requires a COM interface that the selected filter, pin or graph object does not implement.
Evidence to collect
- Capture 1: object CLSID, requested IID and QueryInterface result.
- Capture 2: media type and graph role that led to the interface request.
- Capture 3: component version and bitness.
Where the failure belongs
This result belongs to DirectShow filter-graph processing. The relevant condition is that a DirectShow operation requires a COM interface that the selected filter, pin or graph object does not implement.
Likely causes
- Possible cause 1: the wrong filter type was selected for a specialized operation.
- Possible cause 2: a third-party component advertises a capability but omits the corresponding interface.
- Possible cause 3: code assumes an optional legacy interface is universal.
Diagnostic sequence
- Confirm that the observed path matches this condition: a DirectShow operation requires a COM interface that the selected filter, pin or graph object does not implement.
Correct handling and retry
- Corrective action 1: query capabilities before using optional interfaces.
- Corrective action 2: select a component that implements the required contract.
- Corrective action 3: provide a fallback path instead of casting or assuming interface support.
Retry guidance. Retry only with a different object or after installing a component version that implements the interface.
Difference from nearby HRESULTs
E_NOINTERFACE is the generic COM result; it is the DirectShow-specific failure exposed by a graph component or operation.
Practical scenario
A player assumes every renderer supports IVideoWindow, but the selected audio-only renderer does not; capability-based branching avoids it.
Official Microsoft references
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