Re: Need to create a C lib - using C++ classes - is it possible
On May 28, 7:00 pm, Paavo Helde <nob...@ebi.ee> wrote:
James Kanze <james.ka...@gmail.com> kirjutas:
The root module must know something about the plugins: an entry
point, for example. I think what you meant was that it only
knows it "symbolically", as a string constant in the code, and
not as some information in the .exe or the .dll format which the
system must exploint.
There is a standard entry point called DllMain(). Windows will call that
function when loading and unloading the DLL. In that function the DLL can
register itself in the data structures by the main application in some way=
..
In our case the DLL typically defines some new classes derived from the
abstract base classes provided by the framework, and the registration
involves base class pointers to the derived class objects.
AFAIK Posix has similar entry and exit points called init() and fini().
At least in Posix, those aren't entry points in the usual sense;
dlopen will only return after init() returns. They do provide
the hook for the initialization of static data, however, and
having a static variable which registers with some sort of
registry in the root is a well established technique under Unix.
--
James Kanze (GABI Software) email:james.kanze@gmail.com
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