Java Native Interface with any arbitrary C code

Question

I have a .dll that was provided, and I need to interface with it using java.

Do I have to rewrite the C to use the JNI types provided in jni.h? as seen in java sun's jni example. Otherwise, How do i declare the native function my java function to pass and receive pointers?

thanks

Peter Lawrey · Accepted Answer · 2009-05-27 20:30:47Z

4

You may find JNA useful

"JNA provides Java programs easy access to native shared libraries (DLLs on Windows) without writing anything but Java code—no JNI or native code is required. This functionality is comparable to Windows' Platform/Invoke and Python's ctypes. Access is dynamic at runtime without code generation."

answered May 27, 2009 at 20:30

Peter Lawrey

535k83 gold badges770 silver badges1.2k bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Eric Petroelje · Accepted Answer · 2009-05-27 20:20:43Z

3

In a way, yes.

Most of the time you would just write a small "wrapper" dll with functions that would do the type conversions and delegate to the corresponding functions in the "real" DLL.

answered May 27, 2009 at 20:20

Eric Petroelje

60.7k9 gold badges133 silver badges178 bronze badges

Comments

Charlie Martin · Accepted Answer · 2009-05-27 20:25:40Z

2

You can rewrite the C code of course, but it's not uncommon to write a wrapper (technically, using the Facade or Bridge pattern) for the C code. You write code that matches your expectations in the Java, and have that code call your existing C code.

answered May 27, 2009 at 20:25

Charlie Martin

113k27 gold badges198 silver badges268 bronze badges

Collectives™ on Stack Overflow

Java Native Interface with any arbitrary C code

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related