Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Jim Janney <jjanney@shell.xmission.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: End of String Problem: Sending C++ string to java code
Date: Wed, 09 Oct 2013 11:03:34 -0600
Organization: bilaterally symmetric
Lines: 26
Message-ID: <ydniox6js0p.fsf@shell.xmission.com>
References: <177b1b66-ea89-4995-ab6c-9187bb754895@googlegroups.com> <ydnmwmijsmv.fsf@shell.xmission.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Injection-Info: mx05.eternal-september.org; posting-host="c75a2e3068ccf6c98395286f3e40b97d"; logging-data="25283"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+FPcEJYBea1owFrRv4LU0l"
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux)
Cancel-Lock: sha1:9731VncYpVy9+vo98RSvY3iBikU= sha1:5Cwe2bReackoeB2y9ocaFfq1dus=
Xref: csiph.com comp.lang.java.programmer:26254

Jim Janney <jjanney@shell.xmission.com> writes:

> clusardi2k@aol.com writes:
>
>> Question: How should I send a string from C++ to java. 
>>
>> When I send a string (std::string) from the C++ code to the java code (String), I have to count (on the java side) the number of characters that I expect.
>>
>> If I don't take a specific number of characters I get more characters than I want on the java side. The extra characters are garbage.
>>
>> I tried appending the standard end of string ("\0") in C++ code and sending the string to java code, but the problem was not resolved.
>>
>> Any ideas,
>> Thanks,
>
> My C++ is very rusty at the moment, but I'm pretty sure that instances
> of std::string can contain nul characters internally.  Use the size or
> length methods to get the number of characters.

And if you're calling std::string::data, there's no guarantee that the
result will be terminated.  See

http://www.cplusplus.com/reference/string/string/data/

-- 
Jim Janney