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LAN Interface Supplement 6-17
Controlling the Analyzer via the LAN
Controlling the Analyzer with a C Program
if (recv_line(sock, result+1, maxLength-1) == NULL) return 0;
/* REMOVE trailing newline, if present. And terminate string. */
resultBytes = strlen(result);
if (result[resultBytes-1] == '\n') resultBytes -= 1;
result[resultBytes] = '\0';
}
} while (0);
return resultBytes;
}
/*************************************************************************
*
> $Function: showErrors$
*
* $Description: Query the SCPI error queue, until empty. Print results. $
*
* $Return: (void)
*
*************************************************************************/
void showErrors(SOCKET sock)
{
const char * command = "SYST:ERR?\n";
char result_str[256];
do {
queryInstrument(sock, command, result_str, sizeof(result_str)-1);
/******************************************************************
* Typical result_str:
* -221,"Settings conflict; Frequency span reduced."
* +0,"No error"
* Don't bother decoding.
******************************************************************/
if (strncmp(result_str, "+0,", 3) == 0) {
/* Matched +0,"No error" */
break;
}
puts(result_str);
} while (1);
}
/***************************************************************************
*
> $Function: isQuery$
*
* $Description: Test current SCPI command to see if it a query. $
*
* $Return: (unsigned char) . . . non-zero if command is a query. 0 if not.
*
***************************************************************************/
unsigned char isQuery( char* cmd )
{
unsigned char q = 0 ;