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WCM_E_INVALIDHANDLERSYNTAX
WCM_E_INVALIDHANDLERSYNTAX is the failure HRESULT 0x8022001F (signed decimal -2145255393, unsigned decimal 2149711903). Its severity bit is 1, facility is 34 (FACILITY_STATE_MANAGEMENT), and the facility-specific code field is 0x001F.
AllStat records the Windows SDK description as “Handler attribute is of invalid syntax.”
What the HRESULT establishes
The handler declaration has invalid syntax. The operation reached parsing the metadata attribute that identifies or configures a settings handler. The first branch to test is whether the handler string has malformed separators or qualification; keep that separate from the possibility that quoting/escaping changed the attribute.
Processing stage
At this boundary, capture raw handler attribute and decoded value, then correlate it with source line/column and containing setting declaration. Assign ownership only after checking a known-good handler declaration from the same component.
Failure patterns to separate
- the handler string has malformed separators or qualification
- quoting/escaping changed the attribute
- a module path or entry description uses unsupported syntax
- a generator emits a runtime class notation that SMI does not accept
Capture these facts first
- raw handler attribute and decoded value
- source line/column and containing setting declaration
- a known-good handler declaration from the same component
- manifest generator and transformation history
- whether syntax or resolution fails first in a reduced test
A safe investigation order
- fix lexical structure before checking module availability
- use schema-aware authoring rather than string concatenation
- separate XML escaping from handler-reference grammar
- compare with the target component’s official metadata
- compile the smallest manifest containing the handler attribute
Recovery conditions
Retry only with corrected handler syntax. Installing a module cannot make an unparsable reference valid.
Do not confuse it with adjacent codes
WCM_E_HANDLERNOTFOUND means a valid-looking reference has no definition. INVALIDHANDLERSYNTAX means SMI cannot interpret the reference itself.
Deployment example
A generator places an unescaped delimiter in the handler attribute. The parser fails before it can search for the named handler.
Telemetry fields worth retaining
For operational telemetry, retain a known-good handler declaration from the same component; also record manifest generator and transformation history. Preserve a redacted summary of whether syntax or resolution fails first in a reduced test; use a cryptographic hash when that evidence is a file, stream, or generated artifact.
Official Microsoft references.
- Microsoft: SMI error and success constants.
- Microsoft: Settings Management Infrastructure API.
- Microsoft: SMI interfaces.
- Microsoft: ISettingsContext::Deserialize.
- Microsoft: ISettingsResult::GetLine.
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