IFillLockBytes::FillAt method (objidl.h)

The FillAt method writes a new block of data to a specified location in the byte array.

Syntax

HRESULT FillAt(
  [in]  ULARGE_INTEGER ulOffset,
  [in]  const void     *pv,
  [in]  ULONG          cb,
  [out] ULONG          *pcbWritten
);

Parameters

[in] ulOffset

The offset, expressed in number of bytes, from the first element of the byte array.

[in] pv

Pointer to the data to be written at the location specified by uIOffset.

[in] cb

Size of pv in bytes.

[out] pcbWritten

Number of bytes that were successfully written.

Return value

This function supports the standard return values E_OUTOFMEMORY, E_UNEXPECTED, E_INVALIDARG, and E_FAIL in addition to the following:

Remarks

The FillAt method is used for nonsequential downloading (for example, HTTP byte range requests). In nonsequential downloading the caller specifies ranges in the byte array where various blocks of data are to be written. Subsequent calls by the compound file implementation to ILockBytes::ReadAt are passed by the byte array wrapper object's own implementation of ILockBytes to the underlying byte array. This method is not currently implemented and will return E_NOTIMPL.

Requirements

See also

IFillLockBytes - Implementation

IFillLockBytes::FillAppend

ILockBytes::ReadAt