C++ BView::Archive方法代码示例

	void MessageReceived(BMessage* message)
	{
		switch (message->what) {
			case 'BOOM':
				if (!fBoom) {
					fBoom = _MakeButton("BOOM");
					fLayout2->AddView(fBoom, fLeft, fTop,
						fRight, fBottom);
				} else {
					if (fBoom->IsHidden(fBoom))
						fBoom->Show();
					else
						fBoom->Hide();
				}
				break;
			case 'arcv': {
				BView* view = GetLayout()->View();
				BMessage archive;
				status_t err = view->Archive(&archive, true);
				BWindow* window = new BWindow(BRect(30, 30, 400, 400),
					"ALM Friend Test Clone", B_TITLED_WINDOW,
					B_QUIT_ON_WINDOW_CLOSE | B_AUTO_UPDATE_SIZE_LIMITS);
				window->SetLayout(new BGroupLayout(B_VERTICAL));
				BView* clone;
				if (err == B_OK)
					err = BUnarchiver::InstantiateObject(&archive, clone);
				if (err != B_OK)
					window->AddChild(new BStringView("", "An error occurred!"));
				else {
					window->AddChild(clone);
				}
				window->Show();

				break;
			}
			default:
				BWindow::MessageReceived(message);
		}
	}

/*! The add-ons must support the exported C function API
	if they do, they will be loaded and added to deskbar
	primary function is the Instantiate function
*/
status_t
TReplicantTray::LoadAddOn(BEntry* entry, int32* id, bool addToSettings)
{
	if (!entry)
		return B_ERROR;

	node_ref nodeRef;
	entry->GetNodeRef(&nodeRef);
	// no duplicates
	if (NodeExists(nodeRef))
		return B_ERROR;

	BNode node(entry);
	BPath path;
	status_t status = entry->GetPath(&path);
	if (status < B_OK)
		return status;

	// load the add-on
	image_id image = load_add_on(path.Path());
	if (image < B_OK)
		return image;

	// get the view loading function symbol
	//    we first look for a symbol that takes an image_id
	//    and entry_ref pointer, if not found, go with normal
	//    instantiate function
	BView* (*entryFunction)(image_id, const entry_ref*);
	BView* (*itemFunction)(void);
	BView* view = NULL;

	entry_ref ref;
	entry->GetRef(&ref);

	if (get_image_symbol(image, kInstantiateEntryCFunctionName,
			B_SYMBOL_TYPE_TEXT, (void**)&entryFunction) >= B_OK) {
		view = (*entryFunction)(image, &ref);
	} else if (get_image_symbol(image, kInstantiateItemCFunctionName,
			B_SYMBOL_TYPE_TEXT, (void**)&itemFunction) >= B_OK) {
		view = (*itemFunction)();
	} else {
		unload_add_on(image);
		return B_ERROR;
	}

	if (view == NULL || IconExists(view->Name())) {
		delete view;
		unload_add_on(image);
		return B_ERROR;
	}

	BMessage* data = new BMessage;
	view->Archive(data);
	delete view;

	AddIcon(data, id, &ref);
		// add the rep; adds info to list

	if (addToSettings) {
		fAddOnSettings.AddString(kReplicantPathField, path.Path());
		_SaveSettings();
	}

	return B_OK;
}