IFWXIOBuffer::ReadAt Method

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

HRESULT ReadAt(
  ULONG ulOffset,
  void *pv,
  ULONG cb,
  ULONG *pcbRead
);

Parameters

ulOffset

Specifies the starting point from the beginning of the buffer for reading data.

pv

Pointer to the buffer into which the buffer content is copied.

cb

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 Values

S_OK

The method succeeded.

E_INVALIDARG

Invalid parameter.

E_POINTER

Null pointer argument.

FWX_E_BUFFER_FULL

The buffer is full.