Hi,

I'm going to write a shell extension, and for this purpose I use C++ and
ATL.

The shell extension should then show a GUI window, and the user will
interact with the controls contained in this window.
I'd like to develop this GUI part in C# (I'd like to write two versions, one
using WinForm and another one using WPF, to do some comparisons).

However, the problem is the communication between the C++/ATL part and the
C# GUI part.
I thought about passing some data using the command line, i.e.

- make the C# GUI part a standalone .exe
- the C++/ATL shell extension calls the C# GUI .exe passing data using
command line

My questions are:

1. Does it exist a limit to the total length of command line string?

2. Is there another way to do communication between C++/ATL and C# .exe ?
(e.g. if I had to pass binary data and not text data, the command line
technique would not be good)

(Another option would be to write the shell extension as single C++/ATL
module, using WTL for the GUI part.)

Thanks in advance,
Giovanni