November 1999
Intermediate to advanced
832 pages
19h 28m
English
Content preview from Practical Programming in Tcl & Tk, Third EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Event Loop Moves from Tk to Tcl
To support network sockets, the event loop was moved from Tk to Tcl. This means that the after and update commands are now part of Tcl. The fileevent command was added to support non-blocking I/O. The vwait command was added to Tcl, and this is equivalent to the tkwait variable command. Event-driven I/O is described in Chapter 16 starting on page 217.
The tkerror command has been replaced by bgerror. This is the procedure that is called when an error occurs while processing an event. Backwards compatibility is provided if you already define tkerror. These procedures are described on page 190.
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