又是我在使用 CORBA 时遇到了麻烦。我只是想在 CORBA 中编写一些示例接口,其中接口将具有一个属性。
这是我的idl文件:
interface Interfface
{
readonly attribute double number;
exception myOwnException {
string reason;
};
void ffunction(in double arg) raises (myOwnException);
double getNumber();
void setNumber(in double number);
};
我对 IDL 接口的实现:
#include "interface.hh"
class Implementation : public POA_Interfface
{
private :
double number;
public :
virtual void ffunction(double arg);
virtual double getNumber();
virtual void setNumber(double number);
};
#include "implementation.h"
void Implementation::ffunction(double arg)
{
this->number = 0;
arg++;
throw Interfface::myOwnException("Sth went terribly wrong!");
}
void Implementation::setNumber(double number){
this->number = number;
}
double Implementation::getNumber(){
return this->number;
}
当我编译interface.idl、implementation.h、implementation.cpp 就可以了。问题是当我想编译我的 server.cpp 时:
#include "implementation.h"
#include <iostream>
#include <omniORB4/CORBA.h>
#include <omniORB4/Naming.hh>
using namespace std;
int main(int argc, char ** argv)
{
try {
// init ORB
CORBA::ORB_ptr orb = CORBA::ORB_init(argc, argv);
// init POA
CORBA::Object_var poa_obj = orb->resolve_initial_references("RootPOA");
PortableServer::POA_var poa = PortableServer::POA::_narrow(poa_obj);
PortableServer::POAManager_var manager = poa->the_POAManager();
// create service
Implementation * service = new Implementation;
// register within the naming service
try {
CORBA::Object_var ns_obj = orb->resolve_initial_references("NameService");
if (!CORBA::is_nil(ns_obj)) {
CosNaming::NamingContext_ptr nc = CosNaming::NamingContext::_narrow(ns_obj);
CosNaming::Name name;
name.length(1);
name[0].id = CORBA::string_dup("TestServer");
name[0].kind = CORBA::string_dup("");
nc->rebind(name, service->_this());
cout << "Server is running ..." << endl;
}
} catch (CosNaming::NamingContext::NotFound &) {
cerr << "not found" << endl;
} catch (CosNaming::NamingContext::InvalidName &) {
cerr << "invalid name" << endl;
} catch (CosNaming::NamingContext::CannotProceed &) {
cerr << "cannot proceed" << endl;
}
// run
manager->activate();
orb->run();
// clean up
delete service;
// quit
orb->destroy();
} catch (CORBA::UNKNOWN) {
cerr << "unknown exception" << endl;
} catch (CORBA::SystemException &) {
cerr << "system exception" << endl;
}
}
它给了我错误:
server.cpp:在函数'int main(int,char**)'中:server.cpp:20:错误:无法分配抽象类型'Implementation' implementation.h:4的对象:注意:因为以下虚拟函数是纯在“实现”中:interface.hh:197:注意:虚拟 CORBA::Double _impl_Interfface::number()
似乎 CORBA 将我的“数字”属性视为一个函数,而不是一个属性,对吗?如何解决?