getDREFs

Gets the value of one or more X-Plane datarefs.

Syntax

Language	Signature
C	int getDREFs(XPCSocket sock, const char* drefs[], float* values[], unsigned char count, int sizes[])
MATLAB	result = getDREFs( drefs, socket )
Java	float[][] getDREFs(String[] drefs)
Python	getDREFs(drefs)

Parameters

sock (C): The socket used to send the command.

msg: The string to display on the screen

drefs: The names of the datarefs to get.

values (C): A 2 dimensional array in which to store the result.

sizes (C): The allocated size of each array in values. When getDREFs returns, each item in sizes will be set to the number of items actually written to the respective array in values, which will be less than or equal to the initial value of that item in sizes.

socket (MATLAB): An optional reference to a socket opened with openUDP that should be used to send the command.

Return value

C: A negative value if an error occurs, otherwise 0.

All others: An array representing the dataref value.

Remarks

Dataref names and their associated data types can be found on the XPSDK wiki. The size of value should match the size given on that page. XPC currently sends all values as floats regardless of the type described on the wiki. This doesn't cause any data loss for most datarefs.

Exceptions

C Error Code	Java Exception	Python Error	Description
-1	IOException		The client is unable to send the command
-2	IOException		The client is unable to read the response

Examples

C

#include "xplaneConnect.h"

XPCSocket sock = aopenUDP("127.0.0.1", 49007);

// Get the status of the gear handle and the actual landing gear
char* drefs[2] = {"sim/cockpit/switches/gear_handle_status", "sim/aircraft/parts/acf_gear_deploy"};
float* values[2];
values[0] = (float*)malloc(1 * sizeof(float));
values[1] = (float*)malloc(10 * sizeof(float));
int sizes[2] = { 1, 10 };
if(getDREFs(sock, drefs, &values, 2, &sizes) < 0)
{
    printf("And error occured.");
}
else
{
    printf("The gear handle status is %f.", values[0][0]);
}

closeUDP(sock);

MATLAB

import XPlaneConnect.*

DREFS = {'sim/cockpit/switches/gear_handle_status',...
         'sim/aircraft/parts/acf_gear_deploy'};

result = getDREFs(DREFS);

Java

import gov.nasa.xpc.XPlaneConnect;

try(XPlaneConnect xpc = new XPlaneConnect())
{
    String[] drefs ={"sim/cockpit/switches/gear_handle_status", "sim/aircraft/parts/acf_gear_deploy"};
    float[][] values = xpc.getDREFs(drefs);
    System.out.print("The gear handle status is ");
    System.out.println(values[0][0]);
}