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Tk GUI to provide system state reporting box
First Widgets, Geometry and Events example from a Well House Consultants training course
More on First Widgets, Geometry and Events [link]
Source code: admin Module: T217
#!/usr/bin/env tclsh
# Tk GUI to provide system state reporting box package require Tk set actions { { {} {date} {(.+)\n} } { {system name} {uname -n} {(\S+)} } { {job q, 1 minute} {uptime} {(\d+\.\d+)} } { {ip address} {ifconfig -a} {.*inet\s+(\S+)}} { {disc usage} {df -k} {(\d+%)} } } proc downdate {what {mode auto}} { upvar $what actions for {set k 0} {$k < [llength $actions]} {incr k} { global say$k set record [lindex $actions $k] set basetext [lindex $record 0] set myCommand [lindex $record 1] set myFilter [lindex $record 2] set gotten [perform $myCommand $myFilter] if {$basetext == ""} { set say$k $gotten } else { set say$k "$basetext ---- $gotten" } } if {$mode == "interactive"} { if {[.pushme cget -text] == "Freeze"} { .pushme configure -text "Thaw" } else { .pushme configure -text "Freeze" } } # re-run the update proc in 1 second if not frozen at present if {[.pushme cget -text] == "Freeze"} { after 1000 "downdate actions" } } # proc to run a system command and return an expression from the result proc perform {this lookfor} { set pipehandle [open "| $this" "r"] set stuff [read $pipehandle] regexp $lookfor $stuff all some close $pipehandle return $some } # ---------------- Main action code. Make and pack buttons and labels for {set k 0} {$k < [llength $actions]} {incr k} { label .say$k -textvariable say$k pack .say$k set say$k default } # should have been "update" but there's one in Tcl already! pack [button .pushme -text "Freeze" -command "downdate actions interactive"] pack [button .done -text "exit" -command exit] # Start off by calculating initial values by running "button pressed" code downdate actions # And enter event loop (no code for that!) Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Tcl * Tcl/Tk * Tcl Programming Also available on on site courses for larger groups Books covering this topic
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other closely related examples on the "First Widgets, Geometry and Events" module index page.
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