AMX AXP-AI8 ANALOG 8-INPUT BOARD Manual do Utilizador descarregar pdf (Página 22)

DNA/DNR-AI-217 Simultaneous Sampling Differential Analog Input Board

Chapter 2 18

Programming with the High Level API

Tel: 508-921-4600 www.ueidaq.com Vers: 4.5

Date: April 2013 DNx-AI-217 Chap2x.fm

United Electronic Industries, Inc.

2.6 Read Data Reading data is done using reader object(s). There is a reader object to read

raw data coming straight from the A/D converter. There is also a reader object to

read data already scaled to volts or mV/V.

The following sample code shows how to create a scaled reader object and

read samples.

CUeiAnalogScaledReader aiReader(aiSession.GetDataStream());

double data[2];

aiReader.ReadSingleScan(data);

2.7 Cleaning-up

the Session

aiSession.CleanUp();

The session object will clean itself up when it goes out of scope or when it is

destroyed. To reuse the object with a different set of channels or parameters,

you can manually clean up the session as follows:

// create a reader and link it to the analog-input session’s stream

// the buffer must be big enough to contain one value per channel

// read one scan, where the buffer will contain one value per channel

// clean up the session

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AMX AXP-AI8 ANALOG 8-INPUT BOARD Manual do Utilizador Página 22