JNI
Hi all,
I have been looking online and am a little confused with this whole JNI thing. I am under the impression that in order to use C/C++ functions, you have to write that code in a certain way (JNI_export or Java this and that in a C/C++ file).
I have an existing DLL that I want to call a function without having to modify the function name. I was reading that Java expects the function name to be something like JNI_function_name ... or something of that nature. How can I use this DLL directly?
Walter
# 1
> Hi all,
>
> I have been looking online and am a little confused
> with this whole JNI thing. I am under the impression
> that in order to use C/C++ functions, you have to
> write that code in a certain way (JNI_export or Java
> this and that in a C/C++ file).
Correct.
>
> I have an existing DLL that I want to call a function
> without having to modify the function name. I was
> reading that Java expects the function name to be
> something like JNI_function_name ... or something of
> that nature. How can I use this DLL directly?
You can't. You need a wrapper.
Either build your own or look around for one of the pseudo wrappers that do that for you.
# 2
Ok,
So maybe now it is more clear. I thought I could write the wrapper in Java by declaring the function there. But, I have to do this:
write a wrapper in C/C++ with those special function names JNI_function ... then put the real function call inside there.
inside of the Java class, I will declare the native functions
Is that correct?
Walter
# 4
Hi,
You can have an easier way by using a generic JNI wrapper.
Many are commercials, we have develop a free one (under LGPL) : JNative
If you must use C++ class dll JNative cannot help you since the DLL does export the new operator. Your class must have a C factory to be used with JNI.
--Marc (http://jnative.sf.net)
Message was edited by:
mdenty
