How to pass data in tree form to caller ?

[GNiewerth]

You better don´t use the tree to store your data, better use a model/document. The tree is only used to display the data. Each movie can be represented by this structure, and since you want to handle multiple movies you need a container of movies. I always use singleton documents in my applications.

#include <string>
#include <vector>

struct Movie
{
   std::string Name;
   std::vector<std::string> Actors;
};

class MovieDocument
{
   std::vector<Movie> Movies_;

public:
   static MovieDocument instance()
   {
      static MovieDocument theDocument;
      return theDocument;
   }

   std::vector<Movie> movies()
   {
      return Movies_;
   }

   const std::vector<Movie> movies() const
   {
      return Movies_;
   }
       
private:
   MovieDocument()
   {
   }

   MovieDocument( const MovieDocument& doc )
   {
   }

   MovieDocument& operator=( const MovieDocument& doc )
   {
   }
};

Read the movie data into the document and then build the tree from the document movie entries.

MyForm::MyForm()
{
   // traverse document movie entries and build tree
   for( std::vector<Movie>::const_iterator movie_it = MovieDocument::instance().movies.begin();
          movie_it != MovieDocument::instance().movies.end(); ++movie_it )
   {
      // Insert new tree node
      TreeNode* Node = RootNode->add( movie_it->Name );

      // insert actors
      for( std::vector<std::string>::const_iterator actor_it = movie_it->Actors.begin();
            actor_it != movie_it->Actors.end(); ++actor_it )
      {
          Node->add( *actor_it );
      }          
   }
}