在解析名称上下文后，CORBA omniORB无法获取远程对象

Question

我有如下所示的IDL

module IClientServer {

  interface IClient 
  {
    void serverResponse(in string name, in string data);

    void start();

    void stop();

    void shutdown();

  };

  interface IServer 
  {

     // Server calls back to client just once in a
     // recursive call before returning.
     // void one_time(in CallBack cb, in string mesg);
    void DataFromX(in string name,in string data,in long lbytes,in short usg);

    void Authenticate(in IClient client, in string dataToNegotiate);

     // Shuts down the server.
    void shutdown();

  };
};

为此，我使用idl2cpp实用工具(onmiORB)生成代理和框架，并按照文档中的建议将生成的文件链接到服务器和客户端应用程序。

然后，我启动了名称服务(omniNames)，并按照文档中的建议添加了注册表项omniORB\InitRef，以便不使用命令行参数连接服务器和客户端应用程序。

下面的是服务器代码

int _tmain(int argc, _TCHAR* argv[])
{
    try 
    {
    int argc = 0;
        _BRDTRACE("Initializing....\n");
        CORBA::ORB_var orb = CORBA::ORB_init(argc, NULL);
//          cerr << "Initialized." << endl;

        CORBA::Object_var obj = orb->resolve_initial_references("RootPOA");
        _BRDTRACE("Resolved.\n");


        PortableServer::POA_var poa = PortableServer::POA::_narrow(obj);
        _BRDTRACE("Narrowed..\n");

            // Obtain a reference to the object, and register it in
            // the naming service.
        server_i* myserver = new server_i();
//          cerr << "Constructed." << endl;

        obj = myserver->_this();
        _BRDTRACE("obj retrieved.\n");

        CORBA::String_var x;
        x = orb->object_to_string(obj);
        _BRDTRACE("obj to string.\n");

        if( !bindObjectToName(orb, obj) )
        {
//            cerr << "Failed to bind obj to name." << endl;
          throw;
        }

        _BRDTRACE("binded\n");
        myserver->_remove_ref();
//          cerr << "removed ref." << endl;

        PortableServer::POAManager_var pman = poa->the_POAManager();
        pman->activate();
        _BRDTRACE("activated.\n");

//          cerr << "Executing..." << endl;
        orb->run();
        _BRDTRACE("Terminated.\n");

        myserver->shutdown();
//          cerr << "Shutdown." << endl;

    }
    catch(CORBA::SystemException&) 
    {
        _BRDTRACE("Caught CORBA::SystemException.\n");
    }
    catch(CORBA::Exception&) {
        _BRDTRACE("Caught CORBA::Exception.\n");
    }
    catch(omniORB::fatalException&) 
    {
        _BRDTRACE("Caught omniORB::fatalException:\n");
//          cerr << "  file: " << fe.file() << endl;
//          cerr << "  line: " << fe.line() << endl;
//          cerr << "  mesg: " << fe.errmsg() << endl;
    }
    catch(...) {
        _BRDTRACE("Caught unknown exception.\n");
    }

}

static CORBA::Boolean
bindObjectToName(CORBA::ORB_ptr orb, CORBA::Object_ptr objref)
{
  CosNaming::NamingContext_var rootContext;

  try {
    // Obtain a reference to the root context of the Name service:
    CORBA::Object_var obj;
    obj = orb->resolve_initial_references("NameService");

    // Narrow the reference returned.
    rootContext = CosNaming::NamingContext::_narrow(obj);
    if( CORBA::is_nil(rootContext) ) {
      _BRDTRACE("Failed to narrow the root naming context.\n");
      return 0;
    }
  }
  catch(CORBA::ORB::InvalidName& ex) {
    // This should not happen!
    _BRDTRACE("Service required is invalid [does not exist].\n");
    return 0;
  }

  try {
    // Bind a context called "test" to the root context:

    CosNaming::Name contextName;
    contextName.length(1);
    contextName[0].id   = (const char*) "birdseye";       // string copied
    contextName[0].kind = (const char*) "collections_context"; // string copied
    // Note on kind: The kind field is used to indicate the type
    // of the object. This is to avoid conventions such as that used
    // by files (name.type -- e.g. test.ps = postscript etc.)

    //CosNaming::NamingContext_var testContext;
    try {
      // Bind the context to root.
      rootContext->bind(contextName, objref);
    }
    catch(CosNaming::NamingContext::AlreadyBound& ex) {
      // If the context already exists, this exception will be raised.
      // In this case, just resolve the name and assign testContext
      // to the object returned:
      CORBA::Object_var obj;
      obj = rootContext->resolve(contextName);
      CosNaming::NamingContext_var testContext = CosNaming::NamingContext::_narrow(obj);
      if( CORBA::is_nil(testContext) ) {
        _BRDTRACE("Failed to narrow naming context.\n");
        return 0;
      }
    }
  } catch(CORBA::COMM_FAILURE& ex) {
   _BRDTRACE("Caught system exception COMM_FAILURE -- unable to contact the naming service.\n");
    return 0;
  }
  catch(CORBA::SystemException&) {
    _BRDTRACE("Caught a CORBA::SystemException while using the naming service.\n");
    return 0;
  }

  return 1;
}

，但是客户端下面的代码在名称上下文解析后返回零对象。无法解决这个问题。请帮忙！

int _tmain(int argc, _TCHAR* argv[])
{
    CORBA::ORB_var orb = CORBA::ORB_init(argc, argv);
    CORBA::Object_var objRef = orb->resolve_initial_references("NameService");
    CORBA::Object_var obj = getObjectReference(orb);
    IClientServer::IServer_var svr = IClientServer::IServer::_narrow(obj.in());
  if( CORBA::is_nil(svr) ) {    **//THIS IS WHERE THE ISSUE IS**
 //   _BRDTRACE("cb_client: The server reference is nil!\n");
    return 0;
  }
    return 0;
}

static CORBA::Object_ptr
getObjectReference(CORBA::ORB_ptr orb)
{
  CosNaming::NamingContext_var rootContext;

  try {
    // Obtain a reference to the root context of the Name service:
    CORBA::Object_var obj;
    obj = orb->resolve_initial_references("NameService");

    // Narrow the reference returned.
    rootContext = CosNaming::NamingContext::_narrow(obj);
    if( CORBA::is_nil(rootContext) ) {
//      cerr << "Failed to narrow the root naming context." << endl;
      return CORBA::Object::_nil();
    }
  }
  catch(CORBA::ORB::InvalidName& ) {
    // This should not happen!
    return CORBA::Object::_nil();
  }
  // Create a name object, containing the name test/context:
  CosNaming::Name name;
  name.length(1);

  name[0].id   = (const char*) "birdseye";       // string copied
  name[0].kind = (const char*) "collections_context"; // string copied
  // Note on kind: The kind field is used to indicate the type
  // of the object. This is to avoid conventions such as that used
  // by files (name.type -- e.g. test.ps = postscript etc.)


  try {
    // Resolve the name to an object reference.
    return rootContext->resolve(name);
  }
  catch(CosNaming::NamingContext::NotFound& nf) {
  }
  catch(CORBA::COMM_FAILURE& ) {
  }
  catch(CORBA::SystemException&) {
  }

  return CORBA::Object::_nil();
}

更新-5pm:实际上服务器端代码也有相同的问题服务器->身份验证从来没有被调用，因为没有引用。

猜测:使用idl2cpp工具生成的代理和存根会出现问题吗？

UPDATE-7:30PM存根上的歧义

更新3-31\11上午11我使用的是omniORB 4.0.3，这是超过10年的历史。这在用VC6编译的早期windows OS版本中非常有效，我怀疑在VS 2008上重新编译时是否存在问题。只是考虑一下升级到去年发布的ommiORB 4.2。什么都不知道..。

更新3-31\5:30下午5:30目前正在构建全方位的ORB4.2.1源代码。虽然我这样做了，但我仍然想知道是否存在连接在旧系统中生成的.lib文件的问题。在这种情况下，我在Windows7中使用的omniORB .lib文件是构建在Windows上的，这会是一个问题吗？即使是this帖子也无法回答，我有一个旧的.lib，它编译和链接良好，没有任何问题&甚至运行时也没有崩溃。

更新4-01\4:30下午4:30实际上我注意到没有服务器运行，我之前发布的服务器代码也是客户端，我现在更新了真正的服务器代码(绑定名称到服务器obj的代码)。但是，即使在这次调整之后，问题仍然没有改变。

Answer 1

最后我解决了这个问题。有两个问题与代码问题1我已经更新了问题(缺少服务器代码)问题2是与名称上下文绑定。

下面的是服务器中bindObjectToName的修改版本

static CORBA::Boolean
bindObjectToName(CORBA::ORB_ptr orb, CORBA::Object_ptr objref)
{
  CosNaming::NamingContext_var rootContext;

  try {
    // Obtain a reference to the root context of the Name service:
    CORBA::Object_var obj;
    obj = orb->resolve_initial_references("NameService");

    // Narrow the reference returned.
    rootContext = CosNaming::NamingContext::_narrow(obj);
    if( CORBA::is_nil(rootContext) ) {
//      cerr << "Failed to narrow the root naming context." << endl;
      return 0;
    }
  }
  catch(CORBA::ORB::InvalidName& ex) {
    // This should not happen!
  //  cerr << "Service required is invalid [does not exist]." << endl;
    return 0;
  }

  try {
    // Bind a context called "test" to the root context:

    CosNaming::Name contextName;
    contextName.length(1);
    contextName[0].id   = (const char*) "birdsEYE";       // string copied
    contextName[0].kind = (const char*) "DataCollectionS"; // string copied
    // Note on kind: The kind field is used to indicate the type
    // of the object. This is to avoid conventions such as that used
    // by files (name.type -- e.g. test.ps = postscript etc.)

    CosNaming::NamingContext_var testContext;
    try {
      // Bind the context to root.
      testContext = rootContext->bind_new_context(contextName);
    }
    catch(CosNaming::NamingContext::AlreadyBound& ex) {
      // If the context already exists, this exception will be raised.
      // In this case, just resolve the name and assign testContext
      // to the object returned:
      CORBA::Object_var obj;
      obj = rootContext->resolve(contextName);
      testContext = CosNaming::NamingContext::_narrow(obj);
      if( CORBA::is_nil(testContext) ) {
    //    cerr << "Failed to narrow naming context." << endl;
        return 0;
      }
    }

    // Bind sender :
    CosNaming::Name objectName;
    objectName.length(1);
    objectName[0].id   = (const char*) "clienT";   // string copied
    objectName[0].kind = (const char*) "sendeR"; // string copied

    try {
      testContext->bind(objectName, objref);
    }
    catch(CosNaming::NamingContext::AlreadyBound& ex) {
      testContext->rebind(objectName, objref);
    }
    // Note: Using rebind() will overwrite any Object previously bound
    //       to /test/Echo with obj.
    //       Alternatively, bind() can be used, which will raise a
    //       CosNaming::NamingContext::AlreadyBound exception if the name
    //       supplied is already bound to an object.

    // Bind receiver :
    CosNaming::Name objectName2;
    objectName2.length(1);
    objectName2[0].id   = (const char*) "clienT";   // string copied
    objectName2[0].kind = (const char*) "receiveR"; // string copied

    try {
      testContext->bind(objectName2, objref);
    }
    catch(CosNaming::NamingContext::AlreadyBound& ex) {
      testContext->rebind(objectName2, objref);
    }


    // Amendment: When using OrbixNames, it is necessary to first try bind
    // and then rebind, as rebind on it's own will throw a NotFoundexception if
    // the Name has not already been bound. [This is incorrect behaviour -
    // it should just bind].

  }
  catch(CORBA::COMM_FAILURE& ex) {
    //cerr << "Caught system exception COMM_FAILURE -- unable to contact the "
    //     << "naming service." << endl;
    return 0;
  }
  catch(CORBA::SystemException&) {
    //cerr << "Caught a CORBA::SystemException while using the naming service."
    // << endl;
    return 0;
  }

  return 1;
}

和客户端代码中修改的getObjectReference以下的静态CORBA::Object_ptr

getObjectReference(CORBA::ORB_ptr orb)
{
  CosNaming::NamingContext_var rootContext;

  try {
    // Obtain a reference to the root context of the Name service:
    CORBA::Object_var obj;
    obj = orb->resolve_initial_references("NameService");

    // Narrow the reference returned.
    rootContext = CosNaming::NamingContext::_narrow(obj);
    if( CORBA::is_nil(rootContext) ) {
//      cerr << "Failed to narrow the root naming context." << endl;
      return CORBA::Object::_nil();
    }
  }
  catch(CORBA::ORB::InvalidName& ex) {
    // This should not happen!
  //  cerr << "Service required is invalid [does not exist]." << endl;
    _BRDTRACE("getObjRef: service required is invalid.\n");
    exit(0);
    return CORBA::Object::_nil();
  }


  // Create a name object, containing the name test/context:
  CosNaming::Name name;
  name.length(2);

  name[0].id   = (const char*) "birdsEYE";       // string copied
  name[0].kind = (const char*) "DataCollectionS"; // string copied
  name[1].id   = (const char*) "clienT";
  name[1].kind = (const char*) "sendeR";
  // Note on kind: The kind field is used to indicate the type
  // of the object. This is to avoid conventions such as that used
  // by files (name.type -- e.g. test.ps = postscript etc.)


  try {
    // Resolve the name to an object reference.
    return rootContext->resolve(name);
  }
  catch(CosNaming::NamingContext::NotFound& ex) {
    // This exception is thrown if any of the components of the
    // path [contexts or the object] aren't found:
    //cerr << "Context not found." << endl;
    _BRDTRACE("getObjRef: context not found.\n");
    exit(0);
  }
  catch(CORBA::COMM_FAILURE& ex) {
    //cerr << "Caught system exception COMM_FAILURE -- unable to contact the "
     //    << "naming service." << endl;
    _BRDTRACE("getObjRef: caught system exception COMM_FAILURE.\n");
    exit(0);
  }
  catch(CORBA::SystemException&) {
    //cerr << "Caught a CORBA::SystemException while using the naming service."
     //<< endl;
    _BRDTRACE("getObjRef: caught system exception while using the name service.\n");
    exit(0);
  }

  return CORBA::Object::_nil();
}