External Program ListBox read

Question

Hello all,

I'm trying to write a program which will be able to read a list box in an external program using WinAPI.

I'm using sendMessage function:

public static extern IntPtr SendMessage(HandleRef hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

and want to send the LB_GETTEXT message to the window of the exernal program.

 

A few questions:

1. How can I get the handler for the external window needed for the "hWnd" variable?

2. Did anyone write something like that before and could be so kind to paste his code for reference?