oBuff = PmBuffer.GetBuffer(nOffset, nSize)
|nOffset||[optional] (Long) Defines the position of read value in the data block. |
The read value must be inside the data block. The item is read either whole or not read at all.
>= 0 - Index (in bytes, zero-based index) in data block.
-4 - The internal automatic position is used (see AutoOffset). It points behind the last read or written value and increases continually.
If the items are read/written one by one then it is not necessary to define the position, but it is handy to use this automated positioning.
|nSize||[optional] (Long) The size of read data block. The value -1 (default) means that the data block is read from the defined starting position to the end.|