From: khan@xraylith.wisc.edu (Mumit Khan) Subject: Re: JNI functions under g++ 27 Oct 1998 14:31:56 -0800 Message-ID: References: <3631355A.DCE4952@sarnoff.com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII To: JAMES DOYLE Cc: Gnu Win32 Mailing List On Fri, 23 Oct 1998, JAMES DOYLE wrote: > But, as Kiyoko Aoki and Andrew Mickish have noted > (re: B19 dll with JNI causing Dr. Watson, October 19), doing > C++ memory allocations doesn't work under GnuWin32 either. > My DLL fails the first time it tries to call new(). I just thought > I'd let Kiyoko and Andrew (and other JNI people out there) know > there's another data point indicating trouble with JNI and > memory allocation. Also, I thought you'd be interested to know > that MSVC++ has trouble with JNI and memory allocation, too. > I've posted to comp.lang.java.programmer asking if JNI > programmers in general have been able to work with C++ allocation > on Windows. Turns out that the problem with cygwin dll when loaded from MSVC app is a different one -- cygwin DLL is not just not initialized properly and pretty much everything is liable to crash. Of course, there may be more issues with C++, but we need to track this basic problem down first. Hopefully we'll track it down soon and fix. I do recommend not holding your breath however ;-) Good news is that mingw works like a charm. I just released a new version of dllhelpers that should allow to build JNI dlls using a single command (cf: dllwrap). I'll announce an example JNI (I'm borrowing one from Andrew Mickish), complete with Makefile, sometime in the next few days. Now, it's as simple as: $ gcc -c -I/include [ ... ] HelloWorldImp.c $ dllwrap -o HelloWorld.dll --add-stdcall-suffix HelloWorldImp.o $ java [...] Regards, Mumit - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request@cygnus.com" with one line of text: "help".