--- In bb4w@yahoogroups.com, Ian Wade G3NRW <g3nrw-radio@...> wrote:

I have written a simple BBC Basic program that makes a tcp connection to
a remote host, then reads from/writes to that host. The program also
opens a COM port.

When running the program here, everything is fine (and so easy with BBC
Basic!).

However, someone else is now testing the program. He is running the
compiled .exe version -- he does not have BBC Basic on his machine. The
program successfully makes the tcp connection, but then, when attempting
to read from the port, an error message box pops up. The title bar says
simply "Error", and the message text says simply "Invalid channel".

I have no idea where this message came from.

As part of initialisation, the program contains these lines:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
install @lib$+"SOCKLIB"
proc_initsockets

on error sys "MessageBox",@hwnd%,report$,0,0 : proccleanup : quit
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This is the only mention of "Message Box" in the whole program, so I
assume this is what's producing the Error pop-up.

Is there any way of tracking down exactly what caused the error message
to appear and what it means?

--
73
Ian, G3NRW

make sure when you open the comport that it is opened! I wrote a program a few years ago and had these problems. the error occurs when the opened com was not infact opened, you try to listen or send ans the error pops up as the channel was not opened.