Would you explain what "$|++" meaning is in the code? Thanks

Its like $foo++ except working on the variable $| , a reall shell-ish (or hack-ish) way to turn autoflush on, as in 

use IO::Handle;
print 1; # doesn't print, puts 1 in the buffer
STDOUT->autoflush(1)
print 1; # prints 1 immediately (and the previously buffered 1)
print "\n2\n"; # \n forces a flush

[download]
Tutorials: Input and Output: Suffering from Buffering?

In reply to Re^3: ztk-webcam snapshot-grabber by Anonymous Monk
in thread ztk-webcam snapshot-grabber by zentara

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