I'm getting this exception even though I use the Structure.toArray() method to create the structure arrays. We're passing only two multi-element arrays into the failing method, and both are set up with the toArray() method. Unfortunately, I couldn't find a working of example of using the toArray method and then passing the array of structures as a method argument. Any insight on this would be GREATLY appreciated!

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Exception in thread "main" java.lang.IllegalArgumentException: Structure array elements must use contiguous memory (at element index 1) at com.sun.jna.Function.convertArgument(Function.java:449) at com.sun.jna.Function.invoke(Function.java:203) at com.sun.jna.Library$Handler.invoke(Library.java:204) at $Proxy0.efm207_collect_tracks_of_paths(Unknown Source) at com.uprr.efm.subroutines.Efm207.getTracksInPaths(Efm207.java:34 ) at com.uprr.efm.subroutines.Efm207.main(Efm207.java:45)

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Here's the basic code, with the failing method call in red:

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package com.uprr.efm.subroutines;

import com.sun.jna.Structure; import com.uprr.efm.Efms; import com.uprr.efm.structures.EntityRangeStructure; import com.uprr.efm.structures.PathRangeStructure; import com.uprr.efm.structures.TrackTypeIdentifierStructure;

//---------------------------------------------------------------------------------------------- public class Efm207 {

EntityRangeStructure[] ranges = (EntityRangeStructure[])(new EntityRangeStructure().toArray(3));

public void getTracksInPaths(PathRangeStructure[] paths) {

int[] inOutCount = new int[1]; int facilityEntityNumber = 12112; double startMile = 276.140; double endMile = 313.970;

Efms.API.INSTANCE.efm207_collect_tracks_of_paths(facilityEntityNumber, startMile, endMile, (short)paths.length, paths, inOutCount, ranges, ranges.length); Efms.checkForErrors(); } //---------------------------------------------------------------------------------------------- public static void main(String[] args) {

Efm207 module = new Efm207();

PathRangeStructure[] ranges = getTestRanges(); module.getTracksInPaths(ranges); System.out.println(module.getRanges()); } //---------------------------------------------------------------------------------------------- private static PathRangeStructure[] getTestRanges() { TrackTypeIdentifierStructure tti = new TrackTypeIdentifierStructure();

tti.segm_sys_nbr = 2165 ; tti.trk_type_code = "SIMN"; tti.zts_sys_nbr = 0 ;

PathRangeStructure[] paths = (PathRangeStructure[])new PathRangeStructure().toArray(2);

paths[0] = new PathRangeStructure(); paths[1] = new PathRangeStructure();

paths[0].tti = tti; paths[0].path_nbr = 98214; paths[0].trk_nbr = 12112; paths[0].path_lgth = 686.4; paths[0].lo_rpl_nbr = 1502698; paths[0].lo_anlz_rl_nbr = 1104478; paths[0].lo_mile_valu = 276.14; paths[0].hi_rpl_nbr =2038739; paths[0].hi_anlz_rl_nbr = 1104538; paths[0].hi_mile_valu = 276.27;

paths[1].tti = tti; paths[1].path_nbr = 98215; paths[1].trk_nbr = 12112; paths[1].path_lgth = 13041.6; paths[1].lo_rpl_nbr = 2038740; paths[1].lo_anlz_rl_nbr = 1104538; paths[1].lo_mile_valu = 276.27; paths[1].hi_rpl_nbr =2023035; paths[1].hi_anlz_rl_nbr = 1096022; paths[1].hi_mile_valu = 278.74;

return paths; } }

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This module provides the prototype for the failing function:

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package com.uprr.efm;

import com.sun.jna.Library; import com.sun.jna.Native; import com.sun.jna.ptr.ByteByReference; import com.uprr.efm.structures.EntityRangeStructure; import com.uprr.efm.structures.NetPathLocationStructure; import com.uprr.efm.structures.PathRangeStructure;

//----------------------------------------------------------------------------------------------

public class Efms {

public interface API extends Library {

API INSTANCE = (API)Native.loadLibrary("c:/upapps/efm/bin/efms-api.dll", API.class); void efm207_collect_tracks_of_paths(int in_fac_enty_nbr, double in_bgng_mile, double in_endg_mile,short path_cnt, PathRangeStructure paths[], int[] out_cnt, EntityRangeStructure output[], int max_output); } }

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And finally, here's the native code we're trying to call

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void efm207_collect_tracks_of_paths(SYSNBR in_fac_enty_nbr, double in_bgng_mile, double in_endg_mile, short int path_cnt, Path_Range_Struct paths[], long int *out_cnt, Enty_Range_Struct output[], long int max_output) { extern Global global; char previous_path[PATH_LEN]; extern char msg_str[ERR_MSG_LEN];

short int p; BOOL full_path = FALSE; long int i, j;

strcpy(previous_path, global.current_path); sprintf(global.current_path, PATH_FORMAT, PROGRAM_ID, previous_path); ...