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Dear Friends,

I know that if you call C++ from java, you have to use JNI. But how to
call Java from C++?

Thanks a lot.
Tony

On 9 Aug 2005 05:55:39 -0700, wrote:
> I know that if you call C++ from java, you have to use JNI. But how
> to call Java from C++?

Much of what you do in native methods involves making calls from C to
Java methods, or accessing fields in Java objects. In other words
there is no real distinction, you use JNI for calls in both
directions.

If you also want to launch a JVM from C, there are a small number of
functions described in the JNI spec under "invocation" for just that
purpose.

/gordon

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Are there any other better methods except JNI?
Thanks a lot
tony

> Are there any other better methods except JNI?

Can the C++ program be changed? If so, how about letting the two talk over
some TCP connection? Or use CORBA if sockets are too low level for you..

Unfortunately C++ program is huge and can not be changed. Is there any
better solutions?Thank a lot.

> Unfortunately C++ program is huge and can not be changed.

Well, if it can NOT be changed, and it doesn't ALREADY have a C -> Java
communications solution in place, then clearly you're going to need magic to
make it communicate with Java, or am I missing something here?

"jan V" <> wrote in message
news:FN8Ke.165664$...
>> Unfortunately C++ program is huge and can not be changed.
>
> Well, if it can NOT be changed, and it doesn't ALREADY have a
> C -> Java
> communications solution in place, then clearly you're going to
> need magic to
> make it communicate with Java, or am I missing something here?
>
I think the OP means that he should do nothing and tomorrow
morning it works.

"jan V" <> wrote in message
news:FN8Ke.165664$...
>> Unfortunately C++ program is huge and can not be changed.
>
> Well, if it can NOT be changed, and it doesn't ALREADY have a
> C -> Java
> communications solution in place, then clearly you're going to
> need magic to
> make it communicate with Java, or am I missing something here?
>
Sorry, I forgot, you can use pipes.

On 2005-08-09, Joan <> wrote:
>
> "jan V" <> wrote in message
> news:FN8Ke.165664$...
>>> Unfortunately C++ program is huge and can not be changed.
>>
>> Well, if it can NOT be changed, and it doesn't ALREADY have a
>> C -> Java
>> communications solution in place, then clearly you're going to
>> need magic to
>> make it communicate with Java, or am I missing something here?
>>
> I think the OP means that he should do nothing and tomorrow
> morning it works.

There's an article in the July 2005 C/C++UJ for a project called
NoodleGlue that bridges C++ to Java. Take a look.

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On 9 Aug 2005 05:55:39 -0700, wrote or quoted :

>I know that if you call C++ from java, you have to use JNI. But how to
>call Java from C++?

You use JNI. It is just a bit more complicated. I strongly recommend
buying a text on this one. The free docs are not adequate.

See http://mindprod.com/jgloss/jni.html


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