how to access a method of C++ library (DLL) in java -

i have 1 c++ dll file. , know methods used in it. need call these methods java code. don't have access modify dll file. please provide me solution this.

i created javacpp purpose. i'll copy/paste sample code , explanations page:

the common use case involves accessing legacy library written c++, example, inside file named legacylibrary.h containing c++ class:

#include <string>  namespace legacylibrary {     class legacyclass {         public:             const std::string& get_property() { return property; }             void set_property(const std::string& property) { this->property = property; }             std::string property;     }; } 

to job done javacpp, can define java class such one--although 1 use parser produce header file demonstrated below:

import com.googlecode.javacpp.*; import com.googlecode.javacpp.annotation.*;  @platform(include="legacylibrary.h") @namespace("legacylibrary") public class legacylibrary {     public static class legacyclass extends pointer {         static { loader.load(); }         public legacyclass() { allocate(); }         private native void allocate();          // call getter , setter functions          public native @stdstring string get_property(); public native void set_property(string property);          // access member variable directly         public native @stdstring string property();     public native void property(string property);     }      public static void main(string[] args) {         // pointer objects allocated in java deallocated once become unreachable,         // c++ destructors can still called in timely fashion pointer.deallocate()         legacyclass l = new legacyclass();         l.set_property("hello world!");         system.out.println(l.property());     } } 

alternately, can produce java interface parsing header file config class such one:

@properties(target="legacylibrary", value=@platform(include="legacylibrary.h")) public class legacylibraryconfig implements parser.infomapper {     public void map(parser.infomap infomap) {     } } 

and following build commands:

$ javac -cp  javacpp.jar legacylibraryconfig.java $ java  -jar javacpp.jar legacylibraryconfig $ javac -cp  javacpp.jar legacylibrary.java $ java  -jar javacpp.jar legacylibrary 

for more complex examples including maven/ide integration, check out javacpp presets!