Agilent Technologies E2094S Guia do Utilizador descarregar pdf (Página 78)

78 Agilent VISA User’s Guide

3 Programming with VISA

/* at this time, we can make 'lockkey'

available to other processes that we know

about. This can be done with shared memory or

other inter-process communication methods.

These other processes can then call

"viLock(vi,VI_SHARED_LOCK, 2000, lockkey,

lockkey)" and they will also have access to

this resource. */

/* Initialize device */

viPrintf (vi, "*RST\n");

/* Make sure no other process or thread does

anything to this resource between the

viPrintf() and the viScanf()calls Note: this

also locks out the processes with which we

shared our 'shared lock' key. */

viLock (vi, VI_EXCLUSIVE_LOCK, 2000,

VI_NULL,VI_NULL);

/* Send an *IDN? string to the device */

viPrintf (vi, "*IDN?\n");

/* Read results */

viScanf (vi, "%t", &buf);

/* unlock this session so other processes and

threads can use it */

viUnlock (vi);

/* Print results */

printf ("Instrument identification string:

%s\n", buf);

/* release the shared lock also*/

viUnlock (vi);

/* Close session */

viClose (vi);

viClose (defaultRM);

}

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Agilent Technologies E2094S Guia do Utilizador Página 78