Communication between Interfaceses

[raochetan]

I have created a ActiveX DLL using ATL wizards. It has 2 dual interfaces IBestServing and IGraph and implemented by CBestServing and CGraph co-class. The IBestServing interface has methods that generate files in a specific format for displaying purpose. The IGraph interface creates windows to displays the specified file. At any point of time any number of windows can be opened.

These objects are created by different forms in client developed using VB. I have situation where in I have to check if an object of CGraph is created or not from the one of the methods in the IBestServing interfaces. The main reason for this check is that, if a file, which is being regenerated, is currently being displayed in a graph, then that file and the concerned window should be closed.

Can anyone suggest with a small piece of code.

Thanks in advance.

 

[DavesTips]

Just set up a global list of CGraph objects or IGraph interfaces I'd use STL) which you can access from all your objects. If it's appartment threading being called from VB you don't have to worry about synchronisation. Hope that this helped!