C++ (Cpp) BMediaRoster::GetLiveNodeInfo示例

MediaNodeControlApp::MediaNodeControlApp(
	const char* pAppSignature,
	media_node_id nodeID) :
	BApplication(pAppSignature) {

	BMediaRoster* r = BMediaRoster::Roster();
	
	// get the node	
	status_t err = r->GetNodeFor(nodeID, &m_node);
	if(err < B_OK) {
		char buffer[512];
		sprintf(buffer,
			"MediaNodeControlApp: couldn't find node (%ld):\n%s\n",
			nodeID, strerror(err));
		(new BAlert("error", buffer, "OK"))->Go();
		return;
	}
	
	// fetch info (name)
	live_node_info nInfo;
	err = r->GetLiveNodeInfo(m_node, &nInfo);
	if(err < B_OK) {
		char buffer[512];
		sprintf(buffer,
			"MediaNodeControlApp: couldn't get node info (%ld):\n%s\n",
			nodeID, strerror(err));
		(new BAlert("error", buffer, "OK"))->Go();
		return;
	}
	
	BString windowTitle;
	windowTitle << nInfo.name << '(' << nodeID << ") controls";		
	
	// get parameter web
	BParameterWeb* pWeb;
	err = r->GetParameterWebFor(m_node, &pWeb);
	if(err < B_OK) {
		char buffer[512];
		sprintf(buffer,
			"MediaNodeControlApp: no parameters for node (%ld):\n%s\n",
			nodeID, strerror(err));
		(new BAlert("error", buffer, "OK"))->Go();
		return;
	}
	
	// build & show control window
	BView* pView = BMediaTheme::ViewFor(pWeb);
	BWindow* pWnd = new PanelWindow();
	pWnd->AddChild(pView);
	pWnd->ResizeTo(pView->Bounds().Width(), pView->Bounds().Height());
	pWnd->SetTitle(windowTitle.String());
	pWnd->Show();
	
	// release the node
	//r->ReleaseNode(m_node);	
}