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The FsRtlGetPerStreamContextPointer macro returns the file system's stream context for a file stream.
Syntax
void FsRtlGetPerStreamContextPointer(
_fo
);
Parameters
_fo
Pointer to a file object for the file stream.
Return value
None
Remarks
File system filter drivers can use the FsRtlGetPerStreamContextPointer macro to obtain a stream context pointer for the file stream that is represented by a given file object. A stream context pointer is a pointer to the file system's stream context for the file stream. This pointer can be passed as a parameter to FsRtlInsertPerStreamContext, FsRtlLookupPerStreamContext, and FsRtlRemovePerStreamContext.
The stream context pointer points to a FSRTL_ADVANCED_FCB_HEADER structure that uniquely identifies the file stream to the file system. This structure is usually embedded in a stream context object, such as a file control block (FCB) or stream control block (SCB). When the file stream is opened, the file system stores a pointer to the FCB or SCB in the file object's FsContext member.
Note The FsRtlGetPerStreamContextPointer macro can only be used on file systems that support advanced FCB headers.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP; Windows 2000 SP4 Update Rollup |
| Target Platform | Desktop |
| Header | ntifs.h (include Ntifs.h) |
| IRQL | <= APC_LEVEL |