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The FltGetInstanceInformation routine returns information about a minifilter driver instance.
Syntax
NTSTATUS FLTAPI FltGetInstanceInformation(
[in] PFLT_INSTANCE Instance,
[in] INSTANCE_INFORMATION_CLASS InformationClass,
[out] PVOID Buffer,
[in] ULONG BufferSize,
[out] PULONG BytesReturned
);
Parameters
[in] Instance
Opaque instance pointer for the caller.
[in] InformationClass
Type of information requested. This parameter can have one of the following values.
| Value | Meaning |
|---|---|
| InstanceBasicInformation | The buffer pointed to by the Buffer parameter receives an INSTANCE_BASIC_INFORMATION structure for the instance. |
| InstanceFullInformation | The buffer pointed to by the Buffer parameter receives an INSTANCE_FULL_INFORMATION structure for the instance. |
| InstancePartialInformation | The buffer pointed to by the Buffer parameter receives an INSTANCE_PARTIAL_INFORMATION structure for the instance. |
| InstanceAggregateStandardInformation | The buffer pointed to by the Buffer parameter receives an INSTANCE_AGGREGATE_STANDARD_INFORMATION structure for the instance. The LegacyFilter portion of the structure is not utilized. This structure is available starting with Windows Vista. |
[out] Buffer
Pointer to a caller-allocated buffer that receives the requested information. The type of the information returned in the buffer is defined by the InformationClass parameter.
[in] BufferSize
Size, in bytes, of the buffer that the Buffer parameter points to. The caller should set this parameter according to the given InformationClass value.
[out] BytesReturned
Pointer to a caller-allocated variable that receives the number of bytes returned in the buffer that Buffer points to. If the input value of BufferSize is too small, FltGetInstanceInformation returns STATUS_BUFFER_TOO_SMALL and sets this variable to the number of bytes required to store the requested information. This parameter is required and cannot be NULL.
Return value
FltGetInstanceInformation returns STATUS_SUCCESS or an appropriate NTSTATUS value, such as one of the following:
| Return code | Description |
|---|---|
|
The buffer that the Buffer parameter points to is not large enough to store the requested information. This is an error code. |
|
An invalid value was specified for the InformationClass parameter. For example, if InstanceAggregateStandardInformation is specified on the operating systems prior to Windows Vista, the routine will return STATUS_INVALID_PARAMETER. This is an error code. |
Remarks
Given a pointer to a minifilter instance, this routine returns information about the minifilter instance. The type of instance information returned is determined by the InformationClass parameter.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Universal |
| Header | fltkernel.h (include FltKernel.h) |
| Library | FltMgr.lib |
| DLL | Fltmgr.sys |
| IRQL | <= APC_LEVEL |
See also
FltEnumerateInstanceInformationByFilter
FltEnumerateInstanceInformationByVolume