java - JNA code working fine in OSx , but unable to lookup function in Linux from C shared object file -


i working following example: https://github.com/caplin/jnijnaexamples/tree/master/jna

in mac, create .dylib file follows:

gcc -shared -fpic -o librandomjna.o randomjna.c

g++ -dynamiclib -undefined suppress -flat_namespace *.o -o librandomjna.dylib

mkdir classes

javac -d classes -classpath jna-4.4.0.jar javanativeaccess.java

cd classes

export ld_library_path=.

java -classpath jna-4.4.0.jar:. com.enlightedinc.apps.where.utils.javanativeaccess

in osx, works expected , able execute c function list_files

now in linux box, created .so file follows

gcc -shared -fpic -o librandomjna.o randomjna.c

gcc -shared -o librandomjna.so *.o

in same way, new classes generated in linux mkdir classes

javac -d classes -classpath jna-4.4.0.jar javanativeaccess.java

cd classes

export ld_library_path=.

java -classpath jna-4.4.0.jar:. com.enlightedinc.apps.where.utils.javanativeaccess

now when try execute code in ubuntu box, following error exceptionjava.lang.unsatisfiedlinkerror: error looking function 'randomnumber': ./librandomjna.so: undefined symbol: randomnumber

  • what can possibly go wrong ?
  • whats difference between .dylib , .so file ?
  • why .dylib (mac osx) can resolve function calls , whereas .so file (linux) fails function ?

any highly appreciated.

thanks kaniska

first of all, try following:

export ld_library_path=${ld_library_path}:.

then, make sure file contains expect

nm librandomjna.so | grep rand

Comments

Post a Comment

Popular posts from this blog

php - Vagrant up error - Uncaught Reflection Exception: Class DOMDocument does not exist -

i've set bento/ubuntu-16.04 vagrant box using php 5.6, , getting following error quite few times when try , run shell script: "uncaught reflection exception: class domdocument not exist". i've tried adding following top of script (not together), each no success: "sudo apt-get install php5.6-xml", "sudo apt-get install php5-xml", "sudo apt-get install php-dom" i've tried resetting server "sudo service apache2 restart". does have suggestions?
Read more

vue.js - Create hooks for automated testing -

Image
qa guys complained can't automate frontend testing. because our html looks same outside. lazy hack did this <template> <div :role="$options.name"> ... </div> </template> <script> export default { name: 'vmcomponentname' } </script> which takes name script , applies html. in browser get: <div role="vmcomponentname"> ... </div> line :role="$options.name" goes in every component. is there dry er solutions? please share. additional details i'll explain in details looking for. imagine have vmusercreate form creates user. test case can create user . to automatically test without role, have use following selector: .wrapper > .wrapper > .wrapper > .submit-button the test extremely brittle (will break lot). if use roles can use [role="vmusercreateform"] .submit-button selector. many folds less brittle. so basically, i'm ...
Read more

Add new key value to json node in java -

i have json file : { "id":1, "name":"abc", "addressdetails": { "city":"newyork" } } i wanted add 1 more key-value ("pincode" : "414141") node 'addressdetails'. i tried using : objectmapper mapper = new objectmapper(); jsonnode root = mapper.readtree(new file("d://test.json")); objectnode node = mapper.createobjectnode(); node.with("addressdetails").put("pincode", "414141"); but it's not getting added, there way can ? you can try you should modify file path objectmapper mapper = new objectmapper(); objectnode nodes = mapper.readvalue(new file("d:\\test.txt"), objectnode.class); nodes.with("addressdetails").put("pincode", "414141"); mapper.writer().writevalue(new file("d:\\test.txt"), nodes);
Read more