viVQueryf

NI-VISA 15.0 Help

Edition Date: June 2015

Part Number: 370131S-01

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Purpose

Performs a formatted write and read through a single call to an operation.

C Syntax

ViStatus viVQueryf(ViSession vi, ViString writeFmt, ViString readFmt, ViVAList params)

Visual Basic Syntax

viVQueryf&(ByVal vi&, ByVal writeFmt$, ByVal readFmt$, params as Any)

Resource Classes

GPIB INSTR, Serial INSTR, TCPIP INSTR, TCPIP SOCKET, VXI INSTR, VXI SERVANT

Parameters

Name Direction Description

vi

IN

Unique logical identifier to a session.

writeFmt

IN

String describing the format of write arguments.

readFmt

IN

String describing the format of read arguments.

params

IN/OUT

A list containing the variable number of write and read parameters. The write parameters are formatted and written to the specified device. The read parameters store the data read from the device after the format string is applied to the data.

Return Values

Completion Codes Description

VI_SUCCESS

Successfully completed the query operation.

Error Codes Description

VI_ERROR_INV_OBJECT

The given session reference is invalid.

VI_ERROR_RSRC_LOCKED

Specified operation could not be performed because the resource identified by vi has been locked for this kind of access.

VI_ERROR_IO

Could not perform Read/Write operation because of I/O error.

VI_ERROR_TMO

Timeout occurred before Read/Write operation completed.

VI_ERROR_INV_FMT

A format specifier in the writeFmt or readFmt string is invalid.

VI_ERROR_NSUP_FMT

The format specifier is not supported for current argument type.

VI_ERROR_ALLOC

The system could not allocate a formatted I/O buffer because of insufficient resources.

Description

This operation is similar to viQueryf(), except that the params parameters list provides the parameters rather than the separate arg parameter list

Note  Because the prototype for this function cannot provide complete type-checking, remember that all output parameters must be passed by reference.


Related Topics

INSTR Resource

SOCKET Resource

viQueryf

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