I am akshay from India,i have been using factory_map to get the object of a class at the run time , but i am not been able to get access of the functions which are non static or non const , please suggest me any way to do so.
Naturally, if you're using a factory, only those methods which are declared virtual in the base class are going to be callable across the shared library boundary. If you need more than this, I'd suggest using Boost.Reflection.
My ISP is having connectivity problems lately. I'd suggest downloading from the Subversion repository anyway - to get the latest build (which should work better than the build from February).
svn co http://svn.boost.org/svn/boost/sandbox sandbox
This will actually check out the whole sandbox - you can look at an earlier post for the actual location of reflection and extension. Jeremy
It may be worthwhile to build with bjam to see what command-line options it generates for the linker and compiler. I'll try to do that if I get the chance in the next couple of days.
9 comments:
Hi Jeremy,
I am akshay from India,i have been using factory_map to get the object of a class at the run time , but i am not been able to get access of the functions which are non static or non const ,
please suggest me any way to do so.
thank you in advance
Akshay
You will have to be more specific.
Naturally, if you're using a factory, only those methods which are declared virtual in the base class are going to be callable across the shared library boundary. If you need more than this, I'd suggest using Boost.Reflection.
Hmmm I can't access http://redshoelace.dlinkddns.com:9080/boost/extension_reflection12Feb08.zip?
Still some probs?
regards, Oliver
Oliver,
My ISP is having connectivity problems lately. I'd suggest downloading from the Subversion repository anyway - to get the latest build (which should work better than the build from February).
svn co http://svn.boost.org/svn/boost/sandbox sandbox
This will actually check out the whole sandbox - you can look at an earlier post for the actual location of reflection and extension.
Jeremy
Hi Jeremy,
I tried out your boost.extension library on Linux (gcc-4.2.4) but the simple word example did not work.
No classes are loaded.
ext::load_single_library(
fm,
"libHelloWorld.so",
"extension_export_word");
factory_list.size() == 0
regards,
Oliver
Did you use bjam to build? If not, I'll need to see what commands you used to build so that I can try and reproduce it.
I used kdevelop instead bjam in order to create an shared library:
g++ -DHAVE_CONFIG_H -I. -I/home/kowalke/Projects/test_extension_lib/src -I.. -I/opt/boost/include/boost-1_35 -O0 -g3 -MT hello_world.lo -MD -MP -MF .deps/hello_world.Tpo -c /home/kowalke/Projects/test_extension_lib/src/hello_world.cpp -o hello_world.o >/dev/null 2>&1
mv -f .deps/hello_world.Tpo .deps/hello_world.Plo
/bin/sh ../libtool --tag=CXX --mode=link g++ -O0 -g3 -o libHelloWorld.la -rpath /usr/local/lib hello_world.lo
g++ -shared -nostdlib /usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../lib/crti.o /usr/lib/gcc/i486-linux-gnu/4.2.4/crtbeginS.o .libs/hello_world.o -L/usr/lib/gcc/i486-linux-gnu/4.2.4 -L/usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../lib -L/lib/../lib -L/usr/lib/../lib -L/usr/lib/gcc/i486-linux-gnu/4.2.4/../../.. -lstdc++ -lm -lc -lgcc_s /usr/lib/gcc/i486-linux-gnu/4.2.4/crtendS.o /usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../lib/crtn.o -Wl,-soname -Wl,libHelloWorld.so.0 -o .libs/libHelloWorld.so.0.0.0
(cd .libs && rm -f libHelloWorld.so.0 && ln -s libHelloWorld.so.0.0.0 libHelloWorld.so.0)
(cd .libs && rm -f libHelloWorld.so && ln -s libHelloWorld.so.0.0.0 libHelloWorld.so)
ar cru .libs/libHelloWorld.a hello_world.o
ranlib .libs/libHelloWorld.a
creating libHelloWorld.la
(cd .libs && rm -f libHelloWorld.la && ln -s ../libHelloWorld.la libHelloWorld.la)
make[2]: Nothing to be done for `all-am'.
thanks!
Oliver
Feel free to send me an e-mail directly: rostovpack - at - yahoo.com.
I believe that you need to add the following flags to the linker on most Linux distributions:
-Wl,-rpath,'$ORIGIN'
In addition to what I said in the previous post:
It may be worthwhile to build with bjam to see what command-line options it generates for the linker and compiler. I'll try to do that if I get the chance in the next couple of days.
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