Hi Nodir,
I saw a problem in your exemple. But I did not know if is this your
problem, but try call the base constructor in your "PyTestPlugin"
constructor, like that:
> class PyTestPlugin(IBasePlugins):
> def __init__(self):
IBasePlugins.__init__(self) <<<<<<<<<<<<<<< here this need
be called explicitly
> self.handle_type = 2
> def canHandle(self, type):
> return type == handle_type
> def handle(self):
> print "handle() from python plugin"
BR
Renato Araujo Oliveira Filho
On Fri, Aug 7, 2009 at 3:54 PM, Nodir GULYAMOV<gelv...@gmail.com> wrote:
> Hello All,
> I am trying to implement plug-ins system using BOOST Python but a little
> stuck. I've read documentation a couple of times and have feeling that
> missed something pretty simple.
> Below simplified version what I am trying to do:
>
> // abstract Base interface class
> class IBasePlugins
> {
> public:
> virtual ~IBasePlugins() {};
> virtual bool canHandle(int type) = 0;
> virtual void handle() = 0;
> };
>
> //some C++ internal plugin (no need to expose to python)
> class IntrPlugin : public IBasePlugins
> {
> public:
> IntrPlugin() : handle_type(1) {}
> bool canHandle(int type) {
> return type == handle_type;
> }
> void handle() {
> std::cout << "handle() from internal plugin" << std::endl;
> }
> private:
> int handle_type;
> };
>
>
> // class to manage plug-ins
>
> typedef boost::shared_ptr<IPlugins> PluginsPtrType;
> typedef vector<PluginsPtrType> VPluginsType;
>
> class PluginsMgr
> {
> public:
> static void register(PluginsPtrType plugin) {
> vplugins.puch_back(plugin);
> }
> static void run(int type) {
> VPluginsType::iterator it;
> for(it = vplugins.begin(); it != vplugins.end(); it++)
> if( (*it)->canHandle(type) ) (*it)->handle();
> }
> private:
> VPluginsType vplugins;
> };
>
> // export to python
> struct IBasePluginsWrap : public IBasePlugins {
> IBasePluginsWrap(PyObject* self_): self(self_) {}
> bool canHandle(int type) {
> return call_method< bool >(self, "canHandle", type);
> }
> void handle() {
> call_method< void >(self, "handle");
> }
>
> PyObject* self;
> };
>
> BOOST_PYTHON_MODULE(pyPlugins)
> {
> class_< IBasePlugins, IBasePluginsWrap, boost::noncopyable
> >("IBasePlugins")
> .def("canHandle", pure_virtual(&IBasePlugins::canHandle))
> .def("handle", pure_virtual(&IBasePlugins::handle))
> ;
>
> class_< PluginsMgr >("PluginsMgr")
> .def("registerPlugin", &PlgMgr::registerPlugin)
> .staticmethod("registerPlugin")
> .def("run", &PlgMgr::run)
> .staticmethod("run")
> ;
>
> register_ptr_to_python<PluginsPtrType>();
> }
>
>
> Then I am using it from python as follows:
>
> from pyPlugins import *
>
> class PyTestPlugin(IBasePlugins):
> def __init__(self):
> self.handle_type = 2
> def canHandle(self, type):
> return type == handle_type
> def handle(self):
> print "handle() from python plugin"
>
>
> pm = PluginsMgr()
> testplg = PyTestPlugin()
> pm.registerPlugin(testplg)
>
> And have error that C++ signature mismatch.
>
> Thank you in advance. I will really appreciate any help.
>
> Kind regards,
> Nodir
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