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.ds f \s-2INQUIRE DEFAULT CHOICE DEVICE DATA\s+2
.TH "INQUIRE DEFAULT CHOICE DEVICE DATA" 3P "15 August 1991"
.SH NAME
INQUIRE DEFAULT CHOICE DEVICE DATA \- inquire the predefined choice data
.IX "Choice Input Devices" "INQUIRE DEFAULT CHOICE DEVICE DATA"
.SH SYNOPSIS
.SS C Syntax
.ft B
.ta 1.25i 3i
.nf
void
pinq_def_choice_data ( type, device, store, error_ind, max_choices, pets, 
	echo_area, choice_data )
Pint	type;	\fIworkstation type\fP
Pint	device;	\fIlogical input device number\fP
Pstore	store;	\fIhandle to Store object\fP
Pint	*error_ind;	\fIOUT error indicator\fP
Pint	*max_choices;	\fIOUT max. number of choices\fP
Pint_list	**pets;	\fIOUT list of prompt and echo types\fP
Plimit	*echo_area;	\fIOUT default echo area\fP
Pchoice_data	**choice_data;	\fIOUT pointer to default data record\fP
.fi
.ft R
.SS Required PHIGS Operating States
(PHOP, *, *, *)
.SH DESCRIPTION
.SS Purpose
Use \*f to determine the following information for a \s-2CHOICE\s+2 input
device associated with a given workstation type:
.RS
.sp .3
\(bu   Number and list of available prompt/echo types
.sp .2
\(bu   Default echo area
.sp .2
\(bu   Default input data record
.sp .2
\(bu   Maximum number of available choices
.RE
.LP
Since the default prompt/echo type for all input devices is 1, the default
input data record is for that prompt/echo type.  There are no default input
data records for prompt/echo types other than 1.
.SS C Input Parameters
.LP
Applications using the \s-2C\s+2 binding must create a buffer to be used by this
function as memory space for storing portions of the device data.
This buffer is passed as the \fIstore\fP argument.
.LP 
The store buffer is a data area managed by \s-2PHIGS\s+2. While the 
application is responsible for creating the initial buffer through a call to 
\s-2CREATE STORE\s+2, \s-2PHIGS\s+2 manages this area such that there is
sufficient memory for the specific inquiry. The choice device data record
within the store buffer is accessed via the pointer returned in \fIchoice_data\fP.
.IP \fItype\fP
The workstation type with which the device is associated.
.IP \fIdevice\fP
The device number of the choice device.
See the \fIAvailable Devices\fP section of \s-2INITIALIZE CHOICE\s+2
for a description of the available devices.
.IP \fIstore\fP
The memory buffer \s-2PHIGS\s+2 is to use for storing the information
returned for the Pchoice_data structure.  This memory is not used for the data
returned in the Pint_list structure.
This buffer must exist prior to calling this function (see
\s-2CREATE STORE (3P)\s+2).
.SS C Output Parameters
.IP \fIerror_ind\fP
The error indicator.  See the \fIExecution\fP section below for a
description of its use.  See the \fIErrors\fP section below for the
possible values it may return.
.IP \fImax_choices\fP
Maximum number of choices.
.IP \fIpets\fP
A pointer to a list of the available prompt/echo types.
Pint_list is defined in phigs.h as follows:
.nf
.ta .5i +1i +1.25i
.sp .4
typedef struct {
.sp .2
	Pint	num_ints;	/* number of Pints in list */
	Pint	*ints;	/* list of integers        */
.sp .2
} Pint_list;
.fi
.IP
The \fInum_ints\fR component specifies the number of elements in the list.
The \fIints\fR component is a pointer to a list \fInum_ints\fR long.
.IP
The application must allocate memory for \fIlen\fR elements in the
list of \fIints\fR.
.IP\fIecho_area\fP
A pointer a Plimit structure to contain the default echo area.
Plimit is defined in phigs.h as follows:
.sp .4
.nf
.ta .5i  +1i  +1i
.sp .2
typedef struct {
.sp .2
	Pfloat	x_min;	/* x min */
	Pfloat	x_max;	/* x max */
	Pfloat	y_min;	/* y min */
	Pfloat	y_max;	/* y max */
.sp .2
} Plimit;
.IP
.fi
.IP \fIchoice_data\fP
A pointer to a Pchoice_data pointer.
PHIGS assigns this pointer to the location in the Pstore structure that
contains the data record contents.
Pchoice_data is defined in phigs.h as follows:
.sp
.ta .5i +.5i +1i +1i
.nf
typedef struct {
.sp .2
      union {
	struct {
   		Pint	unused;
	} pet_r1;
	struct {
		Pint	num_prompts;	/* number of alternatives */
		Ppr_switch	*prompts;	/* array of prompts */
	} pet_r2;
	struct {
		Pint	num_strings;	/* number of choice strings */
		char	**strings;	/* array of choice strings */
	} pet_r3;
	struct {
		Pint	num_strings;	/* number of alternatives */
		char	**strings;	/* array of strings */
	} pet_r4;
	struct {
		Pint	struct_id;	/* struct identifier */
		Pint	num_pick_ids;	/* number of alternatives */
		Pint	*pick_ids;	/* array of pick identifiers */
	} pet_r5;
      } pets;
.sp .2
} Pchoice_data;
.fi
.SS Execution
\*f returns the default data of the specified choice device.  This data is
stored in the workstation description table associated with the workstation
type.
See \s-2INITIALIZE CHOICE\s+2 for a description of the prompt/echo types,
echo area, and data record contents and how to set these values.
.LP
In the event of an error, the \fIerror indicator\fP 
indicates the error number of the error detected, and no other output data
is returned.  If no error is detected, the \fIerror indicator\fP is
set to zero, and the inquired information will be available in the output
parameters.  Since this is an inquiry function, \s-2ERROR HANDLING\s+2 is not
invoked when an error is detected by this function.
.SH ERRORS
.IP 002
Ignoring function, function requires state (\s-2PHOP, *, *, *\s+2)
.IP 052
Ignoring function, workstation type not recognized by the implementation
.IP 051
Ignoring function, this information is not yet available
for this workstation type; open a workstation of this type
and use the specific workstation type
.IP 061
Ignoring function, specified workstation is neither of category \s-2INPUT\s+2
nor of category \s-2OUTIN\s+2
.IP 250
Ignoring function, the specified device is not available
on the specified workstation
.SH SEE ALSO
.nf
.IP
.ta 0.5i
.SM "INITIALIZE CHOICE (3P)"
.SM "INQUIRE DEFAULT CHOICE DEVICE DATA 3 (3P)"
.SM "CREATE STORE (3P)"
.SM "DELETE STORE (3P)"
.fi