Value = PmBuffer.GetInt8(nOffset)
|nOffset||(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. |
The value -4 means that 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.