Promotic

GetBit - method of the PmBuffer object

Description:
Reading the value of one bit.
Syntax:
Boolean GetBit(Long nOffset, Long nBitIndex)
Parameters:
nOffset(Long) Specifies 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 the AutoOffset property). It points behind the last read or written value.
This operation does not shift the internal automatic position.
nBitIndex(Long) Bit index (zero-based index). The value must be any non-negative integer If the value is greater than 7, then the value is internally divided by 8 (byte size). The write position is incremented by the integer part of the division and the bit is the remainder after integer division. The resulting bit position must be in an existing data region.
Note:
This method is also functional in Web panels.
See also:
- PmBuffer.SetBit (method)
- Pm.GetBit (method)
- PmVar.GetBit (method)
Example:
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var oBuf = Pm.CreatePmBuffer();
oBuf.SetInt8(-2, 0);
oBuf.SetBit(0, 0, true);
oBuf.SetBit(0, 1, true);
oBuf.SetBit(0, 2, false);
oBuf.SetBit(0, 3, true);

oBuf.AutoOffset = 0;
var bit0 = oBuf.GetBit(0, 0);
var bit1 = oBuf.GetBit(0, 1);
var bit2 = oBuf.GetBit(0, 2);
var bit3 = oBuf.GetBit(0, 3);

History:
Pm9.00.05: Created
PROMOTIC 9.0.18 SCADA system documentation - MICROSYS, spol. s r.o.

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