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Re: Sorry, resent RE: Accessing exported variables in DLL with dlsym().
- To: Andrej Borsenkow <Andrej dot Borsenkow at mow dot siemens dot ru>
- Subject: Re: Sorry, resent RE: Accessing exported variables in DLL with dlsym().
- From: Farkas Zsolt <seen at philoslabs dot com>
- Date: Thu, 6 Jul 2000 11:20:31 +0200 (CEST)
- cc: cygwin at sourceware dot cygnus dot com
[SEEN]
Philos Laboratories, game development - http://www.philoslabs.com
On Thu, 6 Jul 2000, Andrej Borsenkow wrote:
>
> (Sorry, I clicked wong button)
>
> >
> > I am trying to port a program that opens dynamic library with
> > dlopen() and looks up symbol with dlsym(). This works for
> > function reference but not for variable. The porgram is:
> >
> > main.c:
> >
> > #include <dlfcn.h>
> > #include <stdio.h>
> >
> > main() {
> > int (*foo)(void);
> > void *libfoo;
> >
> > libfoo = dlopen ("libfoo.dll", 0);
> > foo = dlsym (libfoo, "foo");
> > foo();
> > }
> >
> > foo.c:
> >
> > #include <stdio.h>
> > #include <dlfcn.h>
> >
> > __declspec (dllexport) extern foo (void);
> >
> > foo() {
> > char *bar;
> > void *libbar;
> >
> > libbar = dlopen ("libbar.dll", 0);
> > bar = dlsym (libbar, "bar");
> > puts (bar);
> > }
>
> ... continued ...
>
> bar.c:
>
> __declspec (dllexport) char *bar = "Hi! I am bar.";
>
> Compiled with:
>
> gcc -c main.c foo.c bar.c
> dllwrap --output-exp libfoo.exp --output-lib libfoo.a --output-def
> libfoo.def --dllname libfool --export-all-symbols foo.o
> dllwrap --output-exp libbar.exp --output-lib libbar.a --output-def
> libbar.def --dllname libbar.dll --export-all-symbols bar.o
> gcc -o main main.o
>
> Unfortunately, this program prints nothing (that is, bar appears to be
> found - but porbably points to wrong location). IF I bind foo.o with
> libbar.a (and declare bar in foo.c as dllimport) I get correct result.
> The foo() in main() is correctly found.
>
> TIA
>
> -andrej
>
>
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