IFWXIOBuffer::ReadAt method

Applies to: desktop apps only

The ReadAt method reads a specified number of bytes starting at a specified offset from the beginning of the buffer.

Syntax

HRESULT ReadAt(
  [in]   ULONG ulOffset,
  [out]  void *pv,
  [in]   ULONG cb,
  ULONG *pcbRead
);

Parameters

• ulOffset [in]
  Specifies the starting point from the beginning of the buffer for reading data.

• pv [out]
  Pointer to the buffer into which the buffer content is copied.

• cb [in]
  Specifies the number of bytes to attempt to read from the byte buffer.

• pcbRead
  Pointer to a location where this method writes the actual number of bytes copied from the buffer. You can set this pointer to NULL to indicate that you are not interested in this value. In this case, this method does not provide the actual number of bytes copied.

Return value

This method can return one of these values.

• S_OK
  The method succeeded.

• E_INVALIDARG
  Invalid parameter.

• E_POINTER
  Null pointer argument.

Requirements

See also

IFWXIOBuffer

Build date: 7/12/2010