FltDeleteInstanceContext function (fltkernel.h)
FltDeleteInstanceContext removes a context from a given instance and marks the context for deletion.
Syntax
NTSTATUS FLTAPI FltDeleteInstanceContext(
[in] PFLT_INSTANCE Instance,
[out] PFLT_CONTEXT *OldContext
);
Parameters
[in] Instance
Opaque instance pointer for the instance.
[out] OldContext
Pointer to a caller-allocated variable that receives the address of the deleted context. This parameter is optional and can be NULL. If OldContext is not NULL and does not point to NULL_CONTEXT, the caller is responsible for calling FltReleaseContext to release this context when it is no longer needed.
Return value
FltDeleteInstanceContext returns STATUS_SUCCESS or an appropriate NTSTATUS value such as one of the following:
| Return code | Description |
|---|---|
| STATUS_FLT_DELETING_OBJECT | The specified Instance is being torn down. This is an error code. |
| STATUS_NOT_FOUND | No matching context was found. This is an error code. |
Remarks
For more information about contexts, see About minifilter contexts.
Because contexts are reference-counted, it is not usually necessary for a minifilter driver to call a routine such as FltDeleteInstanceContext to explicitly delete a context.
A minifilter driver calls FltDeleteInstanceContext to remove a context from an instance and mark the context for deletion. The context is usually freed immediately unless there is an outstanding reference on it (for example, because the context is still being used by another thread).
To allocate a new context, call FltAllocateContext.
To get an instance context, call FltGetInstanceContext.
To set an instance context, call FltSetInstanceContext.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Universal |
| Header | fltkernel.h (include Fltkernel.h) |
| Library | FltMgr.lib |
| IRQL | <= APC_LEVEL |