passing results from JAVA to procedures in other languages

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Jeremy Watts - 21 Jul 2004 10:57 GMT

hi,

how easy is it to pass results from applets written in JAVA to procedures
written in other languages, more specifically PHP?

i am principally writing something in PHP, but am considering using JAVA for
a specific task, in order to take advantage of its BigDecimal and BigIntger
facilities, and then pass a result from the JAVA routine to a PHP one.

thanks

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Roedy Green - 21 Jul 2004 18:00 GMT

>how easy is it to pass results from applets written in JAVA to procedures
>written in other languages, more specifically PHP?

JNI lets you pass to C/C++. From there you are on your own.

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Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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Tony Morris - 24 Jul 2004 02:02 GMT

> JNI lets you pass to C/C++. From there you are on your own.

JNI doesn't "pass to C/C++".
It passes to "native" code.
How that code was compiled is irrelevant.
The fact that the primary use of JNI is to call out to native code that has
been compiled using C/C++ is also irrelevant.

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Tony Morris
http://xdweb.net/~dibblego/

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Roedy Green - 24 Jul 2004 03:01 GMT

>JNI doesn't "pass to C/C++".
>It passes to "native" code.
>How that code was compiled is irrelevant.
>The fact that the primary use of JNI is to call out to native code that has
>been compiled using C/C++ is also irrelevant.

That is not quite true. JNI passes using C/C++ calling conventions. If
the language you are passing to does not use C/C++ conventions, you
need a bit a C/C++ glue or need to warn the language to generate C
style calls, e.g. Pascal which pushes parms in the opposite order to
C.

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Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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Roedy Green - 24 Jul 2004 06:07 GMT

>That is not quite true. JNI passes using C/C++ calling conventions. If
>the language you are passing to does not use C/C++ conventions, you
>need a bit a C/C++ glue or need to warn the language to generate C
>style calls, e.g. Pascal which pushes parms in the opposite order to
>C.

the other thing to consider is the headers for the JNI library are
provided only in C/C++ form. If you wanted to access them from
Pascal, for example, you would have to write your own equivalent of
Javah.

Signature

Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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passing results from JAVA to procedures in other languages

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