You didn't mention what you're using to show the GUI... that may be important.

In any case, check out the section "Coexisting with Other GUI Main Loops" from Mastering Perl/Tk

Try using a repeating timer event to check the USB device on a regular basis without preventing window events from being handled

In reply to Re: Win32 GUI Input or Event by SuicideJunkie
in thread Win32 GUI Input or Event by perldiverx

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