CAD drawings get the current database (c ++)

Get the current database of file names, and then in our current database is loaded into the data, we test extract some information, such as access to the file name:

  	 	// get the file name
 	 	HTREEITEM hRootDatabase = nullptr;
		{
			// Mx :: mcdbCurDwg () returns the current data object
			//McApDocument* McDbDatabase::GetDocument() const;
 	 		auto sFileName = Mx::mcdbCurDwg()->GetDocument()->fileName();
 	 		// Returns zero length
 	 		if (!wcslen(sFileName))
 	 			return ;
 	 
 	 		hRootDatabase = m_DatabaseInfo.InsertItem(sFileName);
 	 	}