Agilent Technologies FS2010 Guia do Utilizador descarregar pdf (Página 17)

Building a VISA Application in Windows 2

Agilent VISA User’s Guide 17

%s\n", buf);

/* Close session */

viClose(vi);

viClose(defaultRM);}

C/C++ Sample Program Contents

A summary of the VISA function calls used in the preceding

sample C/C++ program follows. For a more detailed

explanation of VISA functionality, see Chapter 3,

“Programming with VISA.” See the VISA Online Help for

more detailed information on these VISA function calls.

Table 2 Summary of VISA Function Calls Used in the C/C++ Sample

Function(s) Description

visa.h

This file is included at the beginning of the program to

provide the function prototypes and constants defined by

VISA.

ViSession

The ViSession is a VISA data type. Each object that will

establish a communication channel must be defined as

ViSession.

viOpenDefaultRM

You must first open a session with the default resource

manager with the viOpenDefaultRM function. This function

will initialize the default resource manager and return a

pointer to that resource manager session.

viOpen

This function establishes a communication channel with

the device specified. A session identifier that can be used

with other VISA functions is returned. This call must be

made for each device you will be using.

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Agilent Technologies FS2010 Guia do Utilizador Página 17