graPHIGS Programming Interface: Subroutine Reference

The graPHIGS Programming Interface : Subroutine Reference

GPQCH - Inquire Choice Device State

GPQCH (wsid, device, type, length, errind, mode, echosw, choice, echo, area, datalen, data)

Note:

This subroutine is a Workstation State List (WSL) inquiry. For an overview, see "WSL Inquiries"

Purpose

Use GPQCH to inquire the current state of the specified choice device on the specified workstation.

If the inquired information is available, then the graPHIGS API sets the error indicator to zero and returns the values in the output parameters. If the error indicator is 533 (an output parameter is not large enough for all the requested data), then the values up to the length specified are returned. If the inquired information is unavailable, then the error indicator (errind) contains an error number indicating the reason, and the values returned in the output parameters are unpredictable.

Parameters

wsid -- specified by user, fullword integer

Workstation identifier.

device -- specified by user, fullword integer

Choice device number (>=1)

type -- specified by user, fullword integer

Type of returned values (1=SET )

length -- specified by user, fullword integer

Length of choice data record array requested in bytes.

errind -- returned by the graPHIGS API, fullword integer

Error indicator. If the error indicator is zero, the request has been completed. Otherwise, one of the following errors exists:

25: SPECIFIED WORKSTATION DOES NOT EXIST
38: WORKSTATION HAS ONLY OUTPUT CAPABILITIES
140: DEVICE NUMBER < ONE OR DEVICE NOT AVAILABLE
509: DATA LENGTH VALUE < ZERO OR REQUIRED LENGTH
533: INQUIRY DATA EXCEEDS AREA. OUTPUT TRUNCATED
534: TYPE VALUE IS INVALID

mode -- returned by the graPHIGS API, fullword integer

Current operating mode (1=REQUEST, 2=SAMPLE, 3=EVENT, 4=APPLICATION_DEFINED ) The graPHIGS API only returns a mode of 4=APPLICATION_DEFINED if the application set the device mode using the Set Input Devi ce State (GPIDMO) subroutine and the mode does not emulate Request, Sample or Event mode.

echosw -- returned by the graPHIGS API, fullword integer

Current echo switch (1=NOECHO, 2=ECHO )

choice -- returned by the graPHIGS API, fullword integer

Current initial choice number.

echo -- returned by the graPHIGS API, fullword integer

Current prompt/echo type.

area -- returned by the graPHIGS API, 6 short floating-point numbers (DC)

Current echo area (Xmin, Xmax, Ymin, Ymax, Zmin, Zmax)

datalen -- returned by the graPHIGS API, fullword integer

Current choice data record length in bytes.

data -- returned by the graPHIGS API, variable length data

Current choice data record.

Error Codes

None

Related Subroutines

GPIDMO: Set Input Device Mode
GPINCH: Initialize Choice

RCP code

201338881 (X'0C003001')