$mw->messageBox( ... ) surely overwrites $^E. The "overlapped" 'error' is often found in $^E, probably because some common, internal task that perl.exe performs generates that result.

Once you grab $^E's contents sooner, your next problem will likely be figuring out which method call is the one that is failing. But you should be able to get the real failure reason, which may be enough to point a finger somewhere.

- tye        

In reply to Re: Win32::SerialPort Error: Overlapped-I/O operation is in progress ($^E too late) by tye
in thread Win32::SerialPort Error: Overlapped-I/O operation is in progress by Dr. Mu

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