I found a solution to this problem:
void handleMessage(void *message)
{
int size = getSize(message);
PyObject *obj = PyBuffer_FromMemory( message, size ) ;
boost::python::handle<> h(obj);
PyGILState_STATE gstate = PyGILState_Ensure();
try
{
call<void>(this->get_override("handleMessage").ptr(), h);
}
catch (const error_already_set)
{
// Catch and ignore exception that is thrown if Python
// onMessage raised an exception. Print it to sys.stderr,
// since there is nothing we can do about it here.
PyErr_Print();
}
PyGILState_Release(gstate);
}
"James Whetstone" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> As the subject implies, I'm having trouble wrapping a C++ class that looks
> like this:
>
> struct A
> {
> virtual void handleMessage(void *message)=0;
> };
>
>
> To wrap this class, I've written the following code:
>
> struct AWrapper : A, wrapper<A>
> {
> void handleMessage(void *message)
> {
> this->get_override("handleMessage")(message);
> }
> };
>
> class_<AWrapper, boost::noncopyable>("A")
> .def("handleMessage", pure_virtual(&A::handleMessage))
> ;
>
>
> My python test code looks like this:
>
> import APackage
>
> class aclass(APackage.A):
> def handleMessage(msg) : print msg
>
>
> But this code crashes when the handleMessage function is called in python
> (I think) because 'void *' cannot be marshalled. Is there some way around
> this? Also, since the void* object is intended to be "zero copy", I
> should probably convert the void * to a PyObject first and re-write my
> handleMessage to look like this:
>
> void handleMessage(void *message)
> {
> int size = getMessageSize(message);
>
> PyObject *obj = PyBuffer_FromReadWriteMemory(message, size);
>
> this->get_override("handleMessage")(obj);
> }
>
> Has anyone done this type of thing? I'm writing this code using MS Visual
> Studio 8 and if anyone can help, it would *very* appreciated.
>
> Thanks!
> James
>
>
>
>
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