FSCTL_GET_RETRIEVAL_POINTER_BASE IOCTL

Description

Returns the sector offset to the first logical cluster number (LCN) of the file system relative to the start of the volume.

To perform this operation, call the DeviceIoControl function with the following parameters.

BOOL DeviceIoControl(
  (HANDLE) hDevice,                    // handle to volume
  FSCTL_GET_RETRIEVAL_POINTER_BASE,    // dwIoControlCode
  (LPVOID) NULL,                       // input buffer
  (DWORD) 0,                           // size of input buffer
  (LPVOID) lpOutBuffer,                // output buffer
  (DWORD) nOutBufferSize,              // size of output buffer
  (LPDWORD) lpBytesReturned,           // number of bytes returned
  (LPOVERLAPPED) lpOverlapped          // OVERLAPPED structure
);

Parameters

Input buffer

Input buffer length

Output buffer

Output buffer length

Input/output buffer

Input/output buffer length

Status block

Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful.

Otherwise, Status to the appropriate error condition as a NTSTATUS code.

For more information, see NTSTATUS Values.

Remarks

Adding the value retrieved by FSCTL_GET_RETRIEVAL_POINTER_BASE to the value retrieved by the FSCTL_GET_RETRIEVAL_POINTERS control code results in a volume-relative file extent offset.

In Windows 8 and Windows Server 2012, this code is supported by the following technologies.

See also

• Clusters and Extents
• DeviceIoControl
• Disk Management Control Codes